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Found 355 results

  1. Yesterday on April 24 I decided to go and visit a place in Mississauga, Ontario called Streetsville which used to be a township of its own before being joined to Mississauga to form the City of Mississauga. I took public transportation to get there and it took me about 1.5 hrs to get there. I went to the Credit River near Streetsville and explored the banks. I had trouble finding a natural exposure as all I was finding were banks with worn out rocks and silt. The river's bottom does not have the same clarity as the Humber River in Etobicoke as I could not see the shale bottom of river. All I was seeing at the Credit's bottom were worn out rocks, algae and silt. The river was also wider than the Humber and in some places it seemed deeper as well which made me think twice about crossing to reach this natural exposure I found. The banks mostly had worn rocks but some nice material can be found. I was surprised at the fauna I found. The rocks are still part of the Georgian Bay Formation but the fossils are completely alien to my eyes. They were nothing that I usually encounter at the Humber River or at Mimico Creek. The place was littered with small coral bits and there lots of what appeared to be Tetradium bits. There also many brachiopod hash plates around. This hash plate here has a piece of coral at the bottom along with many brachiopod bits. There were some things familiar to me like that hash plate of bryozoans and I only found one cephalopod fragment. Where I usually hunt cephalopods are very common to find in Mimico Creek and at the Humber River. There were also these odd trace fossils lying around.
  2. Although this was not requested, I thought it was very interesting, nonetheless. Please send me a PM if anyone wants the paper on this exciting new euarthropod. Siveter, D.J., Fortey, R.A., Zhu, X., & Zhou, Z. (2017) A three-dimensionally preserved aglaspidid euarthropod with a calcitic cuticle from the Ordovician of China. Geological Magazine, (ahead-of-print publication) 15 pp.
  3. Hi all, I hope someone can help me ID these items I've been finding for about a year now in and by a local creek in Sullivan County, TN. I've shown them to staff at the Nature Center of a nearby park and to various others who have an interest in such things, and no one has been able to say for sure what they are. I've had theories from corals to beads to stalactites (helictites, actually) to burrow casts. All are tube-like, all have holes through them (a few have one end closed, but not many) some have a bumpy, pebbly surface and some are smooth. The biggest is 1 1/2 to 2 inches in length. The area is known for Ordovician finds, and has a lot of caves and sinkholes. I also find a lot of quartz crystals and small (< 1") geode-type rocks in this creek, and the occasional Woodland period artifact. There is an abundance of chert/flint, and unfinished knapped pieces aren't uncommon. I'm anxious to hear your theories and ideas. Thanks much.
  4. From the album Trilobites

    Taxonomy: Pseudogygites latimarginatus (2/3 specimen and cephalon) Age: Ordovician (Trenton River Gp) Location: Ottawa, Canada Source: Field collection. Note: The likelihood of finding full specimens as opposed to hash plates of numerous moults is not high.
  5. From the album Trilobites

    Taxonomy: Triarthrus eatoni Age: Ordovician Location: Ottawa, Canada Source: Field Collection
  6. From the album Trilobites

    Taxonomy: Flexicalymene ouzregui (two specimens) Age: Ordovician Location: Anti-Atlas Mtns, Morocco Source: Purchased
  7. Hi everybody. It's been awhile. The last couple of years have seen my attention directed to areas other than old dead things. I need help with an ID. Found this locally, not far from the Silurian black shales that Reudeman discovered his Eurypterids in. I'm not sure of the geology as there have not been any geological surveys of this area. A couple of paleontologists seem to think it's Ordovician. I asked a number of paleontologists at the Paleontological Research Institute an the Museum of Natural History if this was organic or just a geologic anomaly. They weren't sure. I just feel that it looks "on purpose". Now you lucky dogs get a crack at it. Thanks. Tom
  8. 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 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 April 21, 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. 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. 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., 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). 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. 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. 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. 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. 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. (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., 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. 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). 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 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.
  9. Im going to start putting all my trips under 1 topic (easier to find that way.) Ive been collecting three to four times since my last trip report. This included a trip west to the Ordovician (to scout for new roadcuts) a trip east to look for the Nolichucky Shale (Cambrian) and a recent trip to the abandoned quarry I used to frequent (Mississippian, Bangor Limestone.) the Ordovician trips went well, and I managed to collect a wide variety of fossils. I collected from two formations, both of which I had collected from before, but at different locations. The Leiper's (which I cant seem to escape from ) and the Hermitage; of which I was pleased to find another exposure of. First was a whole bunch of brachiopods (of which this is a small sample.) a.) Hebertella occidentalis b.) Platystrophia sp. c.) Rhynchotrema increbescens d.) Onniella sp. e.) Dinorthis pectinella Rhynchotrema seems to occur in the billions in the Hermitage. next up is the bivalves, which are fairly abundant in the Leipers, these mostly consist of internal molds. a and d.) Modiolopsis modiolaris b.) Caritodens sp. (a rare internal mold around here) c.) Ctenodonta pectunculoides (side view, beak is to the right) and a nice mass mortality plate of (mostly) bivalves I picked up at a road-cut on my way home from the last trip west. Its upper Ordovician. the most common ones (labeled a.) Modiolopsis b.) a razor clam, most likely Orthodesma sp. c.)a strophomenid brachiopod d.) an orthid brachiopod, probably Hesperorthis sp. Bryozoans were everywhere but I only picked up a few; I did very well on sponges however a.) a semi-smooshed sponge Hindia sphaeroidalis (with matrix still attached) b.) two nice bryozoans that I haven't ID'ed yet cont. next reply....
  10. Hello all. The other day I was sitting in my car for a day trip out of town, and with me I brought one of the fossil books I love to read. I spent the whole hour or so drive looking through the pictures of the book that gave identifications for various species of fossils, however looking at the pictures I started to think to myself how none of the fossils I've ever found in the field really looked like the pristine specimens pictured in the book. That got me thinking into starting this little thing, a (not yet complete) photo list or guide of different brachiopod species as I've found them in nature, without any prep other than a light washing in some cases. I don't know of how much help this will be to people who've been in the hobby for several years, but it's my hope that this will help new comers identify their finds and learn that more often then not that beautiful shell you see in a book is not what you'll find. In this I've compiled a variety of brachiopod species that I've encountered over the span of nine years hunting in Maryland, however these brachiopod species can also be found in neighboring Pennsylvania, Virginia, West Virginia, New York, New Jersey, and elsewhere. For the most part these all come from Maryland or Pennsylvania and were personally collected by me, however for some of the Ordovician specimens I've had to resort to photos of brachiopods I've found in the Maquoketa Group of southeast Wisconsin a few summers ago (I've only photographed species I've seen recorded from the Ordovician of the region). This is not meant to be a comprehensive list of every species, but rather an introduction to some of the more common ones that collectors are most likely to encounter.
  11. Well every now and then you get lucky and don't even realize it. Was out collecting on Sunday and found what I thought was a few exposed spines of a meadowtownella trilobote. To my surprise when I got home and prepped it , turned out to be something totally different.. Trilo was prepped using 200 mesh dolomite at 20 PSI with a .015 nozzel. Prep time about 15 minutes, very fragile but no consolidant , glue or restoration. Drumroll... as I have never found this species before at this location or anywhere else..... This was found on the surface of a good thousand pound slab in a recent blast pile from the upper part of the verulam exposure at this quarry. Thankfully I had lugged my diamond saw down to the bottom of the pit otherwise this fella would have ended up in the crusher. My buddy Northern Sharks was at the quarry hunting the upper level and never made it down to the bottom (a long trek). I had commented to him over email that I had had a so-so day getting 5 or 6 trilos but nothing spectacular. Now that this is prepped I have changed my mind... I now rate it as a pretty good day. (also found a couple of isotelus, a couple of ceraurus, a very nice syringocrinus and a flexi) I believe it to be an inverted and essentially complete Hypodicranotus striatulus (Walcott) (perhaps pirahna will jump in here with his expertise Notice the partial hypostome whose shape is quite indicative of this species. In fact I may actually have another hypostone in a hash plate matrix that I found a few years ago in the same general that I thought came from a septapsis Trilo is 21mm long by 15.3mm wide
  12. To begin with I am not an Ordovician collector, but after seeing recent posts from other FF members, I decided to stop at the St. Leon and Lawrenceburg road cuts in Southern Indiana as I was making my way to North Carolina. I will post picks without specific ids, I know I have bryozoans, brachiopods, horn corals- but no trilobites. I did find 3 things that look to me to be possible Cephalopods, but could be mistaken. I also found 1 other item that I have no clue to its I'd. Any help with these last 4 items would be appreciated.
  13. Given all of the trauma, paranoia, panic, and birdseed in the news, I though news fluff about fossils is in order. Students search for sea-creature fossils off roadcut in Indiana By Julie Havlak, The Collegain, April 6, 2017 Also, some cute cat pictures are needed to rest the sole: Emergency Kittens Yours, Paul H.
  14. This is a trip to St. Leon, Indiana (Late Ordovician), that I took on Tuesday the 28th. Weather was cloudy, 66 deg. F. Conditions were wet and muddy, but a lot of fresh material had weathered out and was exposed from the winter. More or less typical finds. The complete Ambonychia steinkern was the trip-maker for me. Here is a view of the roadcut.
  15. From the album Ordovician Fossils (by Peat Burns)

    Isotelus maxiumus or I. gigas (juv.) (Trilobita) Late Ordovician: Waynesville or Liberty Formation St. Leon, Indiana, USA This is several views of an enrolled juvenile. It is complete except for the missing genal spines, and the exoskeleton is intact. The dark brown areas are pyritization.

    © 2017 Peat Burns - All Rights Reserved

  16. From the album Ordovician Fossils (by Peat Burns)

    Leptaena richmondensis (Brachiopoda) Late Ordovician: Waynesville Formation St. Leon, Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  17. From the album Ordovician Fossils (by Peat Burns)

    Rafinesquina ponderosa (Brachiopoda) Late Ordovician: Richmondian Stage St. Leon, Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  18. From the album Ordovician Fossils (by Peat Burns)

    Platystrophia (=Vinlandostrophia) ponderosa (Brachiopoda) Late Ordovician: Maysvillian Stage Kentucky, USA

    © 2017 Peat Burns - All Rights Reserved

  19. From the album Ordovician Fossils (by Peat Burns)

    Platystrophia (=Vinlandostrophia) cf. P. acutilirata (Brachiopoda) Late Ordovician: Richmondian Stage Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  20. From the album Ordovician Fossils (by Peat Burns)

    Petrocrania scabiosa (Brachiopoda) Late Ordovician: Richmondian Stage Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  21. From the album Ordovician Fossils (by Peat Burns)

    Eochonetes clarksvillensis (Brachiopoda) Late Ordovician: Waynesville Formation St. Leon, Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  22. This polished specimen shows very well the structure of the phragmocone.
  23. From the album Ordovician Fossils (by Peat Burns)

    Strophomena planumbona (Brachiopoda) Late Ordovician: Liberty Formation St. Leon, Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  24. From the album Ordovician Fossils (by Peat Burns)

    Plaesiomys subquadratus (Brachiopoda) Late Ordovician: Liberty Formation St. Leon, Indiana, USA

    © 2017 Peat Burns - All Rights Reserved

  25. From the album Ordovician Fossils (by Peat Burns)

    Hiscobeccus capax (Brachiopoda) Late Ordovician: Waynesville Formation St. Leon, Indiana, USA

    © 2017 Peat Burns - All Rights Reserved