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Found 473 results

  1. This morning I met about 12 other members of E.S.C.O.N.I. (Earth Science Club of Northern Illinois) at Irene Quarry in Belividere, Illinois for a quick 3 hour visit. The quarry contains hard rock Ordovician dolomite from the Galena Group. This was my first time at this quarry and though I did not find much, I had a great time with the group and we could not have had better weather. Here are some views of the quarry: Here are a fews pics of my finds: Receptaculites- Receptaculites and Hormotoma- Horn Coral- I believe Strepteasma Brachiopod- At first thought that this was a trilobite Cephalon, but now think it is a brachiopod, looks similar to the brachiopod above. If any one can ID, please do so. One of the collectors found a large cephalopod in a block of dolomite. Here is the large section out of the block- Receptaculites - of course I did not take this one.
  2. Lake Champlain Mudstone Find

    Greetings....On a recent visit to Lake Champlain I came across the attached items near the shore of Crown Point. These were eroded out of the bedrock and laying in the sand. On view they look like worm trace or maybe coral..? Any ideas please comment by return...and thanks.
  3. These are a few of the pdf files (and a few Microsoft Word documents) that I've accumulated in my web browsing. MOST of these are hyperlinked to their source. If you want one that is not hyperlinked or if the link isn't working, e-mail me at joegallo1954@gmail.com and I'll be happy to send it to you. Please note that this list will be updated continuously as I find more available resources. All of these files are freely available on the Internet so there should be no copyright issues. Articles with author names in RED are new additions since October 12, 2017. Phylum Arthropoda Ordovician Trilobites Africa/Middle East Corbacho, J. and F.J. Lopez-Soriano (2013). Chattiaspis? budili : a new Dalmanitidae species from Morocco; Upper Ordovician (Lower Katian). Batalleria, 19. Corbacho, J. and J.A. Vela (2013). Parvilichas marochii : New genus and species of Lichidae from the Zagora region (Morocco); Early Ordovician (Floian). Scripta Musei Geologici Seminarii Barcinonensis - Series palaentologica, Number XIV. Corbacho, J. and F.J. Lopez-Soriano (2012). A new asaphid trilobite from the Lower Ordovician (Arenig) of Morocco. Batalleria, 17. Corbacho, J. and C. Kier (2011). Trilobites of a new outcrop of Upper Ordovician in Jebel Tijarfaiouine, El Kaid Errami (Morocco), with first mention of the genus Corrugatagnostus. Scripta Musei Geologici Seminarii Barcinonensis - Series palaentologica, Number X. Corbacho, J. and J.A. Vela (2010). Giant Trilobites from Lower Ordovician of Morocco. Batalleria, 15. Dean, W.T. and Z. Zhiyi (1988). Upper Ordovician Trilobites from the Zap Valley, South-East Turkey. Palaeontology, Vol.31, Part 3. El-Khayal, A.A., and M. Romano (1985). Lower Ordovician Trilobites from the Hanadir Shale of Saudi Arabia. Palaeontology, Vol.28, Part 2. Feist, R., M. Yazdi and T. Becker (2003). Famennian Trilobites from the Shotori Range, E-Iran. Ann.Soc.Geol. du Nord, 10. Lopez-Soriano, F.J. and J. Corbacho (2012). A new species of Symphysops from the Upper Ordovician of Morocco. Batalleria, 17. Martin, E.L.O., et al. (2016). Biostratigraphic and palaeoenvironmental controls on the trilobite associations from the Lower Ordovician Fezouata Shale of the central Anti-Atlas, Morocco. Palaeogeography, Palaeoclimatology, Palaeoecology, 460. Pour, M.G. (2006). Early Ordovician (Tremadocian) trilobites from Simeh-Kuh, Eastern Alborz, Iran. In: Studies in Palaeozoic palaeontology. Bassett, M.G. and V.K. Deisler (eds.), National Museum of Wales Geological Series, Number 25. Pour, M.G. and L.E. Popov (2009). First report on the occurrence of Neseuretinus and Ovalocephalus trilobites in the Middle Ordovician of Iran. Acta Palaeontologica Polonica, 54(1). Pour, M.G. and S.T. Turvey (2009). Revision of some Lower to Middle Ordovician leiostegiid and associated trilobites from Iran and China. Memoirs of the Association of Australasian Palaeontologists, 37. Pour, M.G., M. Vidal and M. Hosseini-Nezhad (2007). An Early Ordovician Trilobite assemblage from the Lashkarak Formation, Dimghan area, northern Iran. Geobios, 40. Pour, M.G., et al. (2015). First reported Late Ordovician trilobites from the High Zagros Ranges, Iran: a biogeographic link between Gondwanan Chinese and Mediterranean Faunas. Geobios, xxx. (Article in Press) Rábano, I., J.C. Gutiérrez-Marco and D.C. García-Bellido (2014). A remarkable illaenid trilobite from the Middle Ordovician of Morocco. Bulletin of Geosciences, 89(2). Rábano, I., et al. (2010). Two more Bohemian trilobites from the Ordovician of Portugal and Morocco. Bulletin of Geosciences, 85(3). Asia/Malaysia/Pacific Islands Fortey, R.A. (1997). Late Ordovician Trilobites from Southern Thailand. Palaeontology, Vol.40, Part 2.Lee, D.-C. (2013). Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jianxi Province, China. Acta Palaeontologica Polonica, 58(4). Pour, M.G., M. and S.T. Turvey (2009). Revision of some Lower to Middle Ordovician leiostegiid and associated trilobites from Iran and China. Memoirs of the Association of Australasian Palaeontologists, 37. Zhou, Z.Q. and Z.-Y. Zhou (2006). Late Ordovician trilobites from the Zhusilenghaierhan area, Ejin Banner, western Inner Mongolia, China. Memoirs of the Association of Australasian Palaeontologists, 32. Zhou, Z.-Y and Z.Q. Zhou (2007). The Late Ordovician cyclopygid trilobite Sagavia Koroleva, 1967, from the Pagoda Formation of southwestern Shaanxi, China. Memoirs of the Association of Australasian Paleontologists, 34. Zhou, Z.-Y,, W.T. Dean and H. Luo (1998). Early Ordovician Trilobites from Dali, West Yunnan, China and Their Palaeobiological Significance. Palaeontology, Vol.41, Part 3. Zhou, Z.-Y. and W.T. Dean (1986). Ordovician Trilobites from Chedao, Gansu Province, North-West China. Palaeontology, Vol.29, Part 4. Zhou, Z.-Y,, et al. (1998). Ordovician Trilobites from the Dwangou Formation, Kalpin, Xinjiang, North-West China. Palaeontology, Vol.41, Part 4. Zhou, Z.-Y., et al. (1994). Cyclopygid Trilobites from the Ordovician of Northeastern Tarim, Xinjiang, Northwest China. Rec. West Aust.Mus., 16(4). Australia/New Zealand Campbell, K.S.W. and G.J. Durham (1970). A New Trinucleid Trilobite from the Upper Ordovician of New South Wales. Palaeontology, Vol.13, Part 4. Fortey, R.A. and J.H. Shergold (1984). Early Ordovician Trilobites Nora Formation, Central Australia. Palaeontology, Vol.27, Part 2. Shergold, J.H. (1975). Late Cambrian and Early Ordovician Trilobites from the Burke River Structural Belt, Western Queensland, Australia. Department of Minerals and Energy, Bureau of Mineral Resources, Geology and Geophysics, Australian Government Publishing Service, Bulletin 153, Vol.1 (text). Webby, B.D. (1974). Upper Ordovician Trilobites from Central New South Wales. Palaeontology, Vol.17, Part 2. Webby, B.D. (1973). Remopleurides and Other Ordovician Trilobites from New South Wales. Palaeontology, Vol.16, Part 3. Webby, B.D. (1971). The Trilobite Pliomerina Chugaeva from the Ordovician of New South Wales. Palaeontology, Vol.14, Part 4. Europe (including Greenland and Siberia) Ahlberg, P. (1989). Agnostid trilobites from the Upper Ordovician of Sweden and Bornholm, Denmark. Bull.geol.soc. Denmark, Vol.37. Ahlberg, P. (1989). Agnostid Trilobites from the Lower Ordovician Komstad Limestone Formation of Killerod, Scania, Sweden. Palaeontology, Vol.32, Part 3. Bergström, J., H. Pärnaste and Z. Zhiyi (2013). Trilobites and biofacies in the Early-Middle Ordovician of Baltica and a brief comparison with the Yangtze Plate. Estonian Journal of Earth Sciences, 62(4). Bruton, D.L. (1976). The Trilobite Genus Phillipsinella from the Ordovician of Scandinavia and Great Britain. Palaeontology, Vol.19, Part 4. Bruton, D.L. (1968). The Trilobite Genus Panderia from the Ordovician of Scandinavia and the Baltic Areas. Norsk Geologisk Tidsskrift, Vol.48 Bruton, D.L. and A.W. Owen (1988). The Norwegian Upper Ordovician illaenid trilobites. Norsk Geologisk Tidsskrift, Vol.68. Budil, P. and J. Bruthansova (2005). Moulting in Ordovician Dalmanitoid and Acastoid Trilobites of the Prague Basin. Preliminary Observation. Geologica acta, Vol.3, Number 004. Budil, P., O. Fatka and J. Bruthansová (2003). Trilobite fauna of the Šárka Formation at Praha-Červený vrch Hill (Ordovician, Barrandian Area, Czech Republic). Bulletin of Geosciences, Vol.78, Number 2. Budil, P., et al. (2011). Arthrorhachis Hawle & Corda, 1847 (Agnostida) in the Prague Basin (Barrandian area, Czech Republic) revisited. Bulletin of Geosciences, 86(4). Budil, P., et al. (2010). Two unique Middle Ordovician trilobites from the Prague Basin, Czech Republic. Journal of the Natural History Museum (Prague), Vol.179(8). de Carvalho, C.N. (2006). Roller Coaster Behavior in the Cruziana rugosa Group from Penha Garcia (Portugal): Implications for the Feeding Program of Trilobites. Ichnos, 13. Dean, W.T. (1991). Ordovician trilobites from the inlier at Le Petit Fond d'Oxhe, Belgium. Bulletin De L'Institut Royal Des Sciences Naturelles De Belgique, Sciences De La Terre, 61. Dean, W.T. (1962). The Ordovician Trilobite Genus Tiresias M'Coy, 1846. Palaeontology, Vol.5, Part 2. Dean, W.T. (1959). Duftonia, a New Trilobite Genus from the Ordovician of England and Wales. Palaeontology, Vol.2, Part 1. Fatka, O., P. Budil and M. David (2015). Digestive structures in Ordovician trilobites Colpocoryphe and Flexicalymene from the Barrandian area of Czech Republic. Estonian Journal of Earth Sciences, 64,4. Fatka, O., et al. (2013). Fossilized guts in trilobites from the Upper Ordovician Letna Formation (Prague Basin, Czech Republic). Bulletin of Geosciences, 88(1). Fortey, R.A. (1975). Early Ordovician trilobite communities. Fossils and Strata, Number 4. Fortey, R.A. (1975). The Ordovician Trilobites of Spitsbergen. II. Asaphidae, Nileidae, Raphiophoridae and Telephinidae of the Valhallfonna Formation. Norsk Polarinstitutt Skrifter, Number 162. Fortey, R.A. (1974). A New Pelagic Trilobite from the Ordovician of Spitsbergen, Ireland and Utah. Palaeontology, Vol.17, Part 1. Frisk, A. (2004). Trilobite biostratigraphy of the Tremadoc Bjorkasholmen Formation on Oland, Sweden. WOGOGOB-2004 Conference Materials. Gendry, D., et al. (2013). Contribution of Morphometrics to the Systematics of the Ordovician Genus Neseuretus (Calymenidae, Trilobita) from the Armorician Massif, France. Journal of Paleontology, 87(3). Gutiérrez-Marco, J.C., et al. (2009). Giant trilobites and trilobite clusters from the Ordovician of Portugal. Geology, Vol.37, Number 5. Hansen, T. (2010). Cyrtometopinid trilobites from the upper Volkhov and lower Lynna Formations (lower Darriwilian) of NW Russia. Bulletin of the Geological Society of Denmark, Vol.58. Hoel, O.A. (2009). The post-cephalic morphology of the middle Ordovician trilobite Prionocheilus narinosus from the central Oslo region, Norway. Norwegian Journal of Geology, Vol.89. Hutchison, R. and J.K. Ingham (1967). New Trilobites from the Tremadoc Series of Shropshire. Palaeontology, Vol.10, Part 1. Jaanusson, V. and L. Ramskold (1993). Pterygometopine Trilobites from the Ordovician of Baltoscandia. Palaeontology, Vol.36, Part 4. Kielan, Z. (1957). On the Trilobite Family Staurocephalidae. Acta Palaeontologica Polonica, Vol.II, Numbers 2-3. Koch, L. (2010). The trilobite fauna from the Ordovician of the Ebbe Anticline (Rhenish Massiv). SDGG-Heft 66, Geotop. MacGregor, A.R. (1963). Upper Llandeilo Trilobites from the Berwyn Hills, North Wales. Palaeontology, Vol.5, Part 4. Mergl, M. (2014). Odontopleurid trilobites of the Katian/Hirnantian boundary interval in the Prague Basin (Bohemia). Bulletin of Geosciences, 89(2). Mergl, M. (2006). Tremadocian Trilobites of the Prague Basin, Czech Republic. Acta Musei Nationalis Pragae, Series B, Historia Naturalis, 62(1-2). Mergl, M., O. Fatka and P. Budil (2008). Lower and Middle Ordovician Trilobite Associations of Perunica: From Shorface Endemicity to Offshore Uniformity (Prague Basin, Czech Republic). In: Advances in trilobite research. Rabano, I, R Gozalo and D. Garcia-Bellido (eds.). Cuadernos del Museo Geominero. Neuman, R.B. and D.L. Bruton (1989). Brachiopods and trilobites from the Ordovician Lower Hovin Group (Arenig/Llanvirn), Holonda area, Trondheim Region, Norway: new and revised taxa and paleogeographic interpretation. Nor.geol.unders.Bull., 414. Owen, A.W. (1981). The trilobite Mucronaspis in the uppermost Ordovician of the Oslo Region, Norway. Norsk Geologisk Tidsskrift, Vol.61. Owen, A.W. and R.A. Heath (1989). A revision of the upper Ordovician trilobite genus Erratencrinurus with a description of a new species from Hadeland. Norsk Geologisk Tidsskrift, Vol.69. Owen, A.W. and J.K. Ingham (1988). The Stratigraphical Distribution and Taxonomy of the Trilobite Onnia in the Type Onnian Stage of the Uppermost Caradoc. Palaeontology, Vol.31, Part 3. Owens, R.M. (1970). The Middle Ordovician of the Oslo Region, Norway 23. The Trilobite Family Proetidae. Norsk Geologisk Tidsskrift, Vol.50. Pärnaste, H. (2006). The Early Ordovician trilobite distribution and zonation of the East Baltic. Proc.Estonian Acad.Sci.Geol., 55(2). Pärnaste, H. (2004). Revision of the Ordovician cheirurid trilobite genus Reraspis with the description of the earliest representative.Proc. Estonian Acad. Sci. Geol., 53(2). Pärnaste, H. and J. Bergström (2014). Lower to Middle Ordovician trilobite faunas along the Ural border of Baltica. Bulletin of Geosciences, 89(2). Pärnaste, H. and A. Popp (2011). First record of Telephina (Trilobita) from the Ordovician of northeastern Estonia and its stratigraphical implications. Estonian Journal of Earth Sciences, 60(2). Pärnaste, H., A. Popp and R.M. Owens (2009). Distribution of the order Proetida (Trilobita) in Baltoscandian Ordovician strata. Estonian Journal of Earth Sciences, 58(1). Price, D. (1977). Species of Tretaspis (Trilobita) from the Ashgill Series in Wales. Palaeontology, Vol.20, Part 4. Price, D. (1974). Trilobites from the Sholeshook Limestone (Ashgill) of South Wales. Palaeontology, Vol.17, Part 4. Rábano, I., et al. (2010). Two more Bohemian trilobites from the Ordovician of Portugal and Morocco. Bulletin of Geosciences, 85(3). Romano, M. (1991). Trilobites from the Ordovician of Portugal. Palaeontology, Vol.34, Part 2. Romano, M. (1990). The Trilobite Protolloydolithus from the Middle Ordovician of North Portugal. Palaeontology, Vol.33, Part 2. Romano, M. (1980). The Trilobite Eccoptochile from the Ordovician of Northern Portugal. Palaeontology, Vol.23, Part 3. Romano, M. and J-L Henry (1982). The Trilobite Genus Eoharpes from the Ordovician of Brittany and Portugal. Palaeontology, Vol.25, Part 3. Romano, M. and A.W. Owen (1993). Early Caradoc Trilobites of Eastern Ireland and Their Palaeogeographical Significance. Palaeontology, Vol.36, Part 3. Rushton, A.W.A. (1988). Tremadoc Trilobites from the Skiddaw Group in the English Lake District. Palaeontology, Vol.31, Part 3. Sadler, P.M. (1974). Trilobites from the Gorran Quartzites, Ordovocian of South Cornwall. Palaeontology, Vol.17, Part 1. Suzuki, Y. (2002). Systematic position and palaeoecology of a cavity-dwelling trilobite, Ityophorus undulatus Warburg, 1925, from the Upper Ordovician Boda Limestone, Sweden. Paleontological Research, Vol.6, Number 1. Suzuki, Y. (2001). Revision of the late Ordovician trilobite Holotrachelus punctillosus (Tornquist, 1884) from Dalarna, Sweden. Acta Palaeontologica Polonica, 46(3). Temple, J.T. (1965). The Trilobite Genus Oedicybele from the Kildare Limestone (Upper Ordovician) of Eire. Palaeontology, Vol.8, Part 1. Tripp, R.P. (1965). Trilobites from the Albany Division (Ordovician) of the Girvan District, Ayrshire. Palaeontology, Vol.8, Part 4. Weir, J.A. (1959). Ashgillian Trilobites from Co. Claire, Ireland. Palaeontology, Vol.1, Part 4. North America Adrain, J.M. (2005). Aulacopleurid Trilobites from the Upper Ordovician of Virginia. Journal of Paleontolgy, 79(3). Adrain, J.M. and S.R. Westrop (2007). The hystricurid trilobite Metabowmania in the Lower Ordovician (Ibexian; Stairsian) of the Great Basin, Utah and Idaho, USA. Memoirs of the Association of Ausralasian Palaeontologists, 34. Adrain,J.M. and S.R. Westrop (2006). Bearriverops, a New Lower Ordovician trilobite genus from the Great Basin, western USA, and classification of the family Dimeropygidae. Can.J.Earth Sci., 44. Adrain, J.M. and S.R. Westrop (2006). A new genus of dimeropygid trilobites from the earliest Ordovician of Laurentia. Acta Palaeontologica Polonica, 51(3). Adrain, J.M. and S.R. Westrop (2005). Lower Ordovician trilobites from the Baumann Fiord Formation, Ellesmere Island, Arctic Canada. Can.J. Earth Sci., 42. Adrain, J.M., N.E.B. McAdams and S.R. Westrop (2009). Trilobite biostratigraphy and revised bases of the Tulean and Blackhillsian Stages of the Ibexian Series, Lower Ordovician, western United States. Memoirs of the Association of Australasian Palaeontologists, 37. Adrain, J.M., et al. (2014). Trilobite biostratigraphy of the Stairsian Stage (upper Tremadocian) of the Ibexian Series, Lower Ordovician, western United States. Memoirs of the Association of Australasian Palaeontologists, 45. Adrain, J.M., et al. (2003). Classification of the Trilobite Subfamilies Hystricurinae and Hintzecurinae Subfam.Nov., With New Genera from the Lower Ordovician (Ibexian) of Idaho and Utah. Memoirs of the Queensland Museum, 48(2). Adrain, J.M., et al. (2001). Systematics of the Ordovician Trilobites Ischyrotoma and Dimeropygiella, With Species from the Type Ibexian Area, Western U.S.A. J.Paleont., 75(5). Brett, C.E., et al. (1999). The Walcott-Rust Quarry: Middle Ordovician Trilobite Konservat-Lagerstätten. J.Paleont.,73(2). Carlucci, J.R. and S.R. Westrop (2012). Trilobite Biofacies Along an Ordovician (Sandbian) Carbonate Buildup to Basin Gradient, Southwestern Virginia. Palaios, Vol.27. Carlucci, J.R., S.R. Westrop and L. Amati (2010). Tetralichine Trilobites from the Upper Ordovician of Oklahoma and Virginia and Phylogenetic Systematics of the Tetralichini. J.Paleont., 84(6). Carlucci, J.R., et al. (2012). A systematic revision of the Upper Ordovician trilobite genus Bumastoides (Illaenidae), with new species from Oklahoma, Virginia and Missouri. Journal of Systematic Palaeontology, Vol.10, Issue 4. Cisne, J.L. (1973). Beecher's Trilobite Bed Revisited: Ecology of an Ordovician Deepwater Fauna. Peabody Museum of Natural History, Postilla Number 160. Farrell, U.C., et al. (2009). Beyond Beecher's Trilobite Bed: Widespread pyritization of soft tissues in the Late Ordovician Taconic foreland basin. Geology, 37. (Thanks to piranha for finding this one!) Fortey, R.A. (1974). A New Pelagic Trilobite from the Ordovician of Spitsbergen, Ireland and Utah. Palaeontology, Vol.17, Part 1. Hall, C.P. (1993). Biometric and Taxonomic Analysis of the Genus Isotelus (Trilobita) from Cincinnatian (Upper Ordovician) Rocks of Ohio, Kentucky and Indiana. Senior Bachelors Thesis - The Ohio State University. (Thanks to doushantuo for finding this one!) Hegna, T.A., M.J. Martin and S.A.F. Darroch (2017). Pyritized in situ trilobite eggs from the Ordovician of New York (Lorraine Group): Implications for trilobite reproductive biology. Geology, Vol.45, Number 3. Hunda, B.R. and N.C. Hughes (2007). Evaluating paedomorphic heterochrony in trilobites: the case of the diminutive trilobite Flexicalymene retrorsa minuens from the Cincinnatian Series (Upper Ordovician), Cincinnati region. Evolution & Development, 9:5. Hunda, B.R., N.C. Hughes and K.W. Flessa (2006). Trilobite Taphonomy and Temporal Resolution in the Mt. Orab Shale Bed (Upper Ordovician, Ohio, U.S.A.). Palaios, Vol.21. Lenz, A.C. and M.Churkin (1966). Upper Ordovician Trilobites from Northern Yukon. Palaeontology, Vol.9, Part 1. Loch, J.D. (2007). Trilobite Biostratigraphy and Correlations of the Kindblade Formation (Lower Ordovician) of Carter and Kiowa Counties, Oklahoma. Oklahoma Geological Survey, Bulletin 149. Ludvigsen, R. and B.D.E. Chatterton (2011). Ordovician Pterygometopidae (Trilobita) of North America. Can.J. Earth Sci., Vol.19(11). McAdams, N.E.B. and J.M. Adrain (2009). New pliomerid trilobite genus Lemureops from the Lower Ordovician (Ibexian, Tulean, Blackhillsian) of western Utah, USA. Memoirs of the Association of Australoasian Palaeontologists, 37. Ross, R.J. (1970). Ordovician Brachiopods, Trilobites and Stratigraphy in Eastern and Central Nevada. U.S. Geological Survey Professional Paper 639. Ross, R.J. (1967). Calymenid and Other Ordovician Trilobites from Kentucky and Ohio. U.S. Geological Survey Professional Paper 583-B. Stitt, J.H. (1983). Trilobites, Biostratigraphy, and Lithostratigraphy of the McKenzie Hill Limestone (Lower Ordovician), Wichita and Arbuckle Mountains, Oklahoma. Oklahoma Geological Survey, Bulletin 134. Swisher, R.E., S.R. Westrop, and L. Amati (2015). The Upper Ordovician trilobite Raymondites Sinclair, 1944 in North America. Journal of Paleontology, 89(1). Taylor, J.D. (1968). An Arkansas Trilobite from Lower Ordovician Rocks. Arkansas Academy of Science Proceedings, Vol.22. Taylor, M.E. and R.B. Halley (1974). Systematics, Environment and Biogeography of Some Late Cambrian and Early Ordovician Trilobites from Eastern New York State. U.S. Geological Survey Professional Paper 834. Tremblay, J. (1989). Middle Ordovician (Whiterockian-Chazyan) Trilobites from the Sunblood Formation, District of Mackenzie. Masters Thesis - Brock University. Tripp, R.P. and W.R. Evitt (1986). Silicified Trilobites of the Family Asaphidae from the Middle Ordovician of Virginia. Palaeontology, Vol.29, Part 4. South/Central America/Caribbean Buitron, B.E. and E. Almazan-Vazquez (2007). Lithostratigraphy and the Early Ordovician Trilobite Ectenonotus westoni (Billings) from Las Norias Ranch, Sonora State, Mexico. In: 4th European Meeting on the Palaeontology and Stratigraphy of Latin America. Diaz-Martinez, E. and I. Rabano, eds. Edgecombe, G.D., et al. (1997). Ontogeny of the Proetoid Trilobite Stenoblepharum, And Relationships of a New Species from the Upper Ordovician of Argentina. J.Paleont., 71(3). Vaccari, N.E., et al. (2006). New raphiophorid trilobites from the Ordovician of Argentina and their biogeographic implications. Memoirs of the Association of Australasian Palaeontologists, 32. General Ordovician Trilobites Order Agnostida Bruton, D.L. and H.A. Nakrem (2005). Enrolment in a Middle Ordovician agnostoid trilobite. Acta Palaeontologica Polonica, 50(3). Order Asaphida Darby, D.G. and E.C. Stumm (1965). A Revision of the Ordovician Trilobite Asaphus platycephalus Stokes.Contributions from the Museum of Paleontology - The University of Michigan, Vol.XX, Number 3. Shiino, Y., et al. (2014). Pelagic or benthic? Mode of life of the remopleuridid trilobite Hypodicranotus striatulus. Bulletin of Geosciences, 89(2). Tanaka, G., et al. (2015). Vision in a Middle Ordovician trilobite eye. Palaeogeography, Palaeoclimatology, Palaeoecology, 433. Whitworth, P.H. (1969). The Tremadoc Trilobite Pseudokainella impar (Salter). Palaeontology, Vol.12, Part 3. Order Corynexochida Adrain, J.M., T.S. Karim and S.R. Westrop (2014). The Early Ordovician (Floian) bathyurid trilobite genera Jeffersonia, Cullisonia and Bathyurina. Memoirs of the Association of Australasian Palaeontologists, 45. Fortey, R.A. (1988). The Ordovician Trilobite Hadrohybus Raymond 1925, and Its Family Relationships. Peabody Museum of Natural History, Postilla Number 202. Order incerti ordinis Adrain, J.M., T.S. Karim and S.R. Westrop (2014). The Early Ordovician (late Tremadocian; Stairsian) dimeropygid trilobite Pseudohystricurus Ross. Memoirs of the Association of Australasian Palaeontologists, 45. Order Phacopida Congreve, C.R. and B.S. Lieberman (2008). Phylogenetic and Biogeographic Analysis of Ordovician Homalonotid Trilobites. The Open Paleontology Journal, 1. Peers, S. (1997). The Taxonomy, Phylogeny and Palaeobiogeography of the Trilobite Families Pliomeridae and Encrinuridae: Reconstructing the Ordovician world using evolving lineages. Volume 1 and Volume 2 together. Ph.D. Thesis - University of Glasgow. (49MB download) Tripp, R.P. (1957). The Trilobite Encrinurus multisegmentatus (Portlock) and Allied Middle and Upper Ordovician Species.Palaeontology, Vol.1, Part 1. Tunnicliff, S.P. (1978). Types of the Ordovician Trilobites Celtencrinurus multisegmentatus (Portlock) and Cryptolithus latus Portlock. Palaeontology, Vol.21, Part 2. Order Proetida McCormick, T. and R.A. Fortey (2002). The Ordovician Trilobite Carolinites, A Test Case for Microevolution in a Macrofossil Lineage. Palaeontology, Vol.45, Part 2. Order Redlichiida Fortey, R.A. (2000). Olenid trilobites: The oldest known chemoautotrophic symbionts? PNAS, Vol.97, Number 12. General Ordovician Trilobites Adrain, J.M. (2013). Chapter 20. A synopsis of Ordovician trilobite distribution and diversity. In: Early Palaeozoic Palaeobiogeography and Palaeogeography. Harper, D.A.T. and T. Servais (eds.), Geological Society London, Memoirs, 38. Whittington, H.B. and C.P. Hughes (1973). Ordovician Trilobite Distribution and Geography. Special Papers in Palaeontology, Number 12.
  4. Ordovician ichnofossils

    More ichnofossils, this time from the Ordovician of the Georgian Bay Fm (Lower member) in Toronto ON. @JUAN EMMANUEL sent them to me. In particular we got wondering about the little bumps all over the 2 pieces in the first pic, and the large 'mound' (or infilled hole) in the last pics. Anyone have any IDs for these or suggestions as to the nature of their formation? Here is the 'mound', with 3 side views.
  5. @Raggedy Man and his "phantom" wife, Laura, came up to fossil hunt for her 31st Birthday and what a hunt it was! I was busy the first day they were here with my little Airbnb Whispering Winds checking people in and out but they had a wonderful day hunting and Paul found a Bumastis trilobite - they are trilobite hunters. He will have to post his pictures. :-) On Saturday I had invited new fossil friend, Todd, from the Twin Cities to hunt with us. He had come on a paid hunt earlier (he left with 2 5 gallon pails of fossils that very long fossil hunting day) and we had bonded and this was a good opportunity for him to get some real fossil hunting done. I had heard about the "mythical" Seven Springs down a favorite sometimes dry wash and was on a mission. So off we went to hunt Orodovician fossils and Seven Springs! It was a lovely fall day in Minnesota in the 60s with leaves slowly turning brilliant colors and falling to cover the floor of the wash. The first part of the wash was not particularly fossiliferous but we had perhaps a mile or two to go to Seven Springs, so I was warning Todd not to pick up too many fossils. And yes that big plate was beautiful, but too heavy to carry out - that is what hammers are for... :-) The day was beautiful and each corner drew us around another. Paul and Laura had gone up the wash. And there were plates that just weren't going to come back with us. But the siren's call of more fossils to be found just kept us going... But this worn Fisherite showing the side structure was one I just had to have! We rounded one bend to see wild morning glories blooming against the gleaming white rocks of the Galena Formation. We were back in pretty far and hit a very fossilierous wall. I was on a mission and just had to keep going to find Seven Springs - was it real or not? Todd was happy to be left there. :-) The next corner of the wash called to me, and the next, and the next... I ran across the tracks of a large white tail and knew I must be near water. Finally! The first of Seven Springs! My mission had paid off! Seven Springs! So serene and beautiful! I had dropped my backpack back by Todd and so fossil hunting my way back was only what I could stuff into my fly fishing vest. When I finally got back, Paul and Laura had hiked down the wash to see what the old folks were up too. :-) Continued...
  6. Unknown Ordovician Coral?

    Ordovician Galena Formation SE Minnesota I believe this to be a coral. ID please! Thank you for looking! :-) bottom
  7. Trip to a new (to me) site

    A friend gave me directions to a locality in Huntingdon/Centre County PA. This is a excavation in the Lower Member of the Ordovician Reedsville Shale (possibly now called the Antes Shale). There were lots of Bryzooians, a variety of shells some with pyrite coatings, trilobites, and crinoid stem pieces. Most all of the fossils seemed to be casts/molds. The shale is so fissile that it was difficult to collect anything whole!I can't wait to get back and sped some time doing some actual digging & splitting though Wednesday was a beautiful day to spend in the woods. I probably would have collected more but kept getting distracted by the 3 or 4 kinds of butterflies flitting around. The last two photos show things that I'm not sure what they are. The circled item is on a small plate almost covered with bryzooians.
  8. Phycodes ottawense

    While going through some old trip buckets, I found this at the bottom. I had initially picked it up because of its interesting appearance but forgot I had it. As far as ichnofossils go, it is a neat one with all its tangled parts, culminating in a kind of "mop head" appearance. I don't generally pick up ichnofossils, but this one was a notable exception. These are formed when organisms such as worms repeatedly burrow into sediment.
  9. Help with St. Leon, Indiana ID's

    I was hoping that someone on the forum could help with the ID of 2 items that I found earlier in the year at the St. Leon road cut. The first is a nice hash plate that contains something that I believe might be a portion of an Isotelus trilobite- it does not have the shape of a brachiopod and is larger than any brachiopod that I have found there. I also believe that the 2 pieces would connect if not for the matrix between them.
  10. Hello, I've been recently fascinated by large isotelus trilobites. Does anyone on here own one and would like to show and talk about it, I would if I owned one but I don't see that happening anytime soon haha. This is the largest I've seen for sale so far that would've been 8 inches, would be nice to be able to find one but I don't have that luxury.
  11. Roadcut in Hamilton

    Today I decided to go and visit a roadcut that I red on one of the Silurian literatures I got my hands on (a big thank you to those that led me to those PDFs relating to the geology of the Niagara Escarpment). It turns out the roadcut on the Niagara Escarpment is near my home which is a pleasant suprise to me, considering that I have been disappointed by the Queenston formation. This roadcut is actually several exposures that run on an access road that can lead one to the upper part of Hamilton, Ontario. Here is the exposure I decided to explore. I chose this exposure as the access is a busy boulevard with cars driving by with no sidewalks and pedestrians. I had several people honk and call out to me as I was exploring the site. Maybe I should have worn a safety vest of some sort? Is that even necessary?
  12. Today I managed to explore and observe an exposure of the Queenston formation up close here in Hamilton, Ontario. I chose a site along the Red Hill Valley Expressway that was easy to access and get down to for a close look. The creek is right next to the highway. I have always passed by this exposure and anticipated the day I'll be able to observe it. The Queenston formation is the last Ordovician formation in south-western Ontario before the rocks hit the Silurian age. The Queenston is what overlains the Georgian Bay formation, the formation I use to hunt in frequently in Toronto, Ontario. This is Red Hill Creek as it passes by next to the Highway.
  13. Honestly I seriously thought about not posting this find from yesterday. I did not want any of you thinking that the fossil gods where being grossly unfair. But then I decided that in all likelihood most of my comrades here on the forum will never have seen one of these, never mind one this is pretty much as good as you find them. Promise not to submit it for IPFOTM. Four of us were out collecting splitting a lot of rock and excavating near the area that I found those two amazing Astrocystites a few weeks ago (August Invertebrate Fossil of the month) After a very unproductive 5 hours two of my friends gave up and headed home leaving the two regular diehards (Myself and J.) Seeing as no one had found anything of note splitting rock in the blast piles, we both decided decided to work on excavating the wall about 25 feet from the area that produced the astrocystites and a wealth of other cystoids and edrioasteroids. After about 8 hours of wall excavating J. was rewarded with a gorgeous complete extra large pleurosystites. As for myself I somehow once again lucked out finding this spectacular Amygdalocysties florealis. Only a few of these are found each year at this site and rarely are they as complete as this. This is a class of echinoderms known as paracrinoids. There are only two species represented in southern Ontario the Comarocystities and this one the amygdalocystites. These only occured in the Ordovician. I guess they were a failed experiment. This specimen was found at the top of the BobCaygeon formation. Here is what they look like...... very weird........ but cool Believe it or not I spent about 5 hours prepping this with 40 micron dolomite, .015 nozzle and 18 PSI. Here is the before picture. I actually knew what it was in the field because of the distinctinve pattern of the plates. I aslo could see that it had a stem and at least one arm in the field. I had to field douse it thoroughly in Cyano as it looked like it was ready to flake off the plate at the slightest tough. Here it is as found.... (not much to look at) Here it is prepped The finished creature is 35 mm x 20 mm wide The whole plate which also has a small crinoid on it.
  14. Association Piece

    In the field, I always seem to pocket neat associations. Two from the last month have been a platyceras affixed to a horn coral, and a tiny brachiopod pressed against the end piece of an orthocone nautiloid. While going through my little pile of dusty high-spired gastropods from last weekend's Brechin trip, I rubbed at the larger one and found a cute, full prone Flexicalymene there. Not a spectacular (re)discovery, but pretty cool nonetheless.
  15. I drove about 4hrs west to find trilobites, came home with cephs. I did happen to find some pretty neat trilobites, but they need prepping, so i won't post them. Hunting more for trilobites this year i come across a lot of other fossils and i find it exceedingly hard to leave a neat looking cephalopod behind, so i grab em. Most of these will be left outside, but some are nice enough for display. Here are some nice ones. I love the contrast and size on this piece. The isotelus cephalon and worm burrows don't hurt either. Continued....
  16. Anyone know their Ordovician sponges?

    I believe i found my first Ordovician sponge fossil while hunting road cuts. Can anyone confirm if this is an Astylospongia or something else?
  17. I have recently been contracted by the State of Minnesota to do veterinary work for the Trout Hatcheries in SE Minnesota. Yesterday was involved in visiting two of the three hatcheries that I will be involved with. On the way to the visits, I just had to take a short look at some rock outcroppings and found this nice specimen!! Looking forward to revisiting this site! I always love multiple specimens in a piece of matrix and finding a maclurite snuggled up against a big cephalopod was a first for me.
  18. upper ordovician orthocone nautiloid?

    Hi, I found this fossil a few years ago on the shoreline of lake ontario right in the city of Kingston Ontario. I believe the exposures here are upper Ordovician age limestone (Gull River formation) however there may have been fill brought in from elsewhere to stabilize the shoreline so this fossil may not be exactly local. It looks to have a siphuncle (acentral) and sutures (relatively close together) so I thought it appeared to be some type of orthocone nautiloid of some type. Based on Bill Hessin's field guide "South Central Ontario Fossils" I thought i might be Gonioceras anceps or Actinoceras but I really don't know. The pics here are not great, but hopefully someone has some ideas. Thanks
  19. Ordovician Odyssey

    It is the last hurrah for me before the school year begins and I'm back riding the lectern. As some of you already know, I am due at a very special quarry near Lake Simcoe to collect with our intrepid @Malcolmt after his jaw-dropping Astrocystites finds. This space will record some of my journey there, and of course our time in the quarry. We made our way out from London going north by northeast this morning and took the back roads. Those of you who have traveled the Grey Highlands and Blue Mountains area know how breathtaking the scenery can be. We found ourselves in Craigleith by about 2 pm. As some will know, the Craigleith and surrounding areas along the lake are full of Whitby Fm shale from the Ordovician, similar to that which one may find in Ottawa's Billings group. They are full of Pseudogygites latimarginatus moults. Of course, it is not legal to collect at the provincial park. The first is a display piece of a full Pseudogygites.
  20. F_senaria

    From the album Trilobites

    Taxonomy: Flexicalymene senaria Age: M. Ordovician Location: Brechin, ON (Verulam Fm). Source: Self-collected Remarks: Prone specimen crushed in the centre. Large pregalebllar lip similar in this specimen as F. croneisi, but lacking the pustules of the latter.
  21. Possible Rusophycus

    After reviewing @aek post "Mystery Fossil of the Upper Cambrian" I saw a response by @doushantuo in regards to a rusophycus and it reminded me of a recent plate that I picked up while collecting at St. Leon, Indiana. The reason I picked it up was that it did remind me of a trilobite resting track that I had seen in the past, but thought it might be too large for trilobites found there. Any ideas or info would be appreciated.
  22. Pseudogygites latimarginatus

    From the album Trilobites

    Taxonomy: Pseudogygites latimarginatus Age: Ordovician (Whitby Formation) Location: Craiglieth area, Ontario Source: Self-collected Notes: Specimen is fairly complete, if not very much damaged. I actually hadn't known it was complete until going through my finds pile.
  23. From the album Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)

    Pholadomorpha pholadiformis (Hall, 1851). Clam found this December 2014, at Mimico creek, Toronto, Canada. Georgian Bay formation, late Ordovician. Was originally in a nodule that was smashed by the erosion.

    © (©)

  24. Bakers dozen

    I had an amazing day up at my local spot collecting. There had been no new blasts or work at the quarry so I decided to scour the pit wall near the north end of a pond area near the road way down into the BobCaygeon formation material. Those who collect there will know the general area. . To my surprise I found very quickly a fortediscus edrioasteroid about 1 1/2 inches across. Will likely post something on it once it is prepped . I quickly noted that there was a crinoid layer about 3 inches above the layer the edrio was on and that there was a layer about 3 inches below the edrio that I could make out tail sections from pleurocystites. Well five hours later we had taken out probably a ton of rock between two of us.We had to remove about 4 feet of overburden to get to the first layer. If only we had brought a 6 foot pry bar we would have been golden. Regardless we excavated about 10 feet of wall going back about 2 1/2 feet. My reward an edrioasteroid, a cyclosystoid, a plate with two unknown at this point large crinoid calyxes, 13 cycstites (a combination of pleurocystites and amycystites). My friends reward an edrioasteroid and some crinoids.... We will be back next weekend with some heavier bars and my friend the excavating machine Kane...... Here is some pictures of the first one I prepped this morning.... We are blessed with some great collecting up here in Ontario Canada...... A number of you have been up to hunt with me over the years..... Hopefully more will make it in the future......
  25. Conularia formosa

    From the album Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)

    Found at Mimico Creek, Toronto, Ontario. Late Ordovician period. This specimen is a positive with a negative counterpart on limestone. This was also found along with a bunch of other Conularia specimens back in the end of Summer at 2015.