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Found 26 results

  1. Just joint and wanted to get my first entry in. This middle Pennsylvanian concretion from Mazon Creek, was discovered in 2015 in pit 2, in an area I call Ivy Ridge thanks to all the Poison Ivy in the area. The finger near the top right should be where the shark emerged. I did not find this shark egg case variety posted. I hope this helps in future identification. Eventually I will be getting the measurement blocks. Shark Egg Case Phylum: Chordata Class: Chondrichthyes Palaeoxyris multiplicatum Horseshoe crab Phylum: Arthopoda Superclass: Chelicerata Class: Merostomata Order: Xiphosura Euproops danae
  2. There are currently 3 recognized species of horseshoe crab known from the Mazon Creek deposit. Of these 3, Liomesaspis is the rarest. They are only known from the Braidwood (non marine) portion of the deposit. The most defining feature is the bulbous cardiac lobe. The few specimens that I have seen are often poorly preserved.
  3. I don't agree with the title, but the fossil is cool, a renamed and reclassified horseshoe crab from Tasmania. https://m.phys.org/news/2019-10-oddness-australian-creatures.html
  4. Good evening folks, I'm new here but was hoping someone could help me identify my find. Firstly I'll be honest and say I'm not even sure this is a fossil. I found it this evening on a beach walk. So it was found on Skegness beach, this is on the east coast of England at the northern end of the Wash, a bay on the North Sea. Skegness beach is mostly sand with a few pebbles and rocks. There are usually very few fossils on the beach and it's not an area known for it's fossils. Over the opposite side of the wash is the Norfolk coastline, this is mostly made up of cliffs with chalk, sandstone and flint I think, but there are more fossils in this area and some small material from the Norfolk coast does make it's way over the 15 to 20 miles and wash up on Skegness beach. This find (if it is a find) is unlike anything I've seen on Skegness beach before and is nothing like any other rocks, stones and pebbles in the area. My first thought was it way be a horseshoe crab fossil, but a quick check on here has me thinking this is not the case. My partner has suggested a small tortoise or turtle and it certainly has that type of shape to it, I'm not sure that the photo (I only seem to be able to add one photo) truly shows the shape but it's the best I can get. The photo is of what I would describe as the underside. Any help with identification is greatly appreciated, or advice on how to add further photos (sorry I'm really not a tech wizard) Thank you in advance for any help.
  5. This fossil is from Quqing of Yunnan, China. It measures 15x20cm. Is it a horseshoe crab, shell or what?
  6. Another strange find

    So I’m kinda a metal detecting guy... but I keep finding things that kinda stick out like a sore thumb that are (non metallic).. actually my son found this one flooded lake in northwestern Ontario Canada...at bottom of a eroded clay bank almost on the beach... looks kinda like a horseshoe crab..trying to get some better pics... with the naked eye you can make out a segmented tail (everything really stands out when it’s wet but not sure if that’s a good idea?) any ideas?
  7. Belinurus

    From the album Carboniferous animals

    Belinurus with preserved legs from the coal measures of the uk.
  8. Belinurus with legs preserve. Uk

    From the album Carboniferous animals

    Belinurus horseshoe crab from the coal measures of the uk.
  9. This is a drawing I made a couple weeks ago. It is Euproops danae, a Pennsylvanian Horseshoe crab from the Mazon Creek (proper). My nodule is 100% complete with no restorations. Being a Mazon specimen, it comes from the Francis Energy Shale and is about 300 million years old. This drawing was done on textured paper with 2B and 4B pencils.
  10. I'm running a paleontology camp this summer in Delaware. We can' actually do much digging because there are no fossils at the camp site. We do, however, have living fossils around that the kids can meet. I'd like to introduce the kids to the living fossils and show them the evidence of their ancient ancestors. We have snapping turtles (common and alligator), an alligator, horseshoe crabs, access to ginkgo leaves and magnolia, pileated woodpeckers aplenty, and triops kits are easy to come by online. Anybody have any fossils of these that they could part with? I have mostly marine fossils I can trade from all over the east coast, though mostly common stuff. From Delaware I have silicified pleistocene cyprus wood from Odessa, DE, belemnites, cretaceous gastropods, brachiopods (lamp shells), pelyceopods, and button corals from the C and D Canal (Mt Laurel Formation), plus various paleozoic tabulate and rugose corals that wash down the river from the Appalachians. I have oodles of shells, stingray plates, coprolites, and a piece of palmate coral from Calvert Cliffs (Miocene, Choptank formation). I have FLUORESCENT pleistocene shells from the Tamiami Formation in Florida. Plus, I have calamities and lycopods from the Lewellyn Formation in Carbondale, PA. The pictures here may not be the exact specimens and only represent a sample. If there is something specific from these locales that interests you, ask me. I might have something. Anyone willing to help me out? It doesn't have to be museum grade, so long as we can match it up to the modern version.
  11. Chinese Horseshoe Crab Fossil?

    Any idea what species of horseshoe crab is that (or is it genuine)? Is horseshoe crab fossil very rare? The specimen was said to be collected from Hebei, China.
  12. Mazon creek Horseshoe crabs

    Which of the Mazon creek Horseshoes would have been closer to fresh or brackish environment. Has anyone found a Euroopes at Fossil Rock??
  13. The horseshoe crab has survived the last five mass extinctions, but now it’s mysteriously dying Akshat Rathi, quarzt, September 14, 2016 http://qz.com/781335/the-horseshoe-crab-has-survived-the-last-five-mass-extinctions-but-now-its-mysteriously-dying-across-asia/ Living fossil' crabs mysteriously dying in Japan Phys.org, September 15, 2016 http://phys.org/news/2016-09-fossil-crabs-mysteriously-dying-japan.html 'Living fossil' crabs are mysteriously dying in their hundreds: 500 dead horseshoe crabs wash ashore in Japan, Daily mail, AFP, September 15, 2016 http://www.dailymail.co.uk/sciencetech/article-3790531/Living-fossil-crabs-mysteriously-dying-Japan.html Hundreds of horseshoe crabs mysteriously dying in Japan, The Straits Times, September 15, 2016 http://www.straitstimes.com/asia/east-asia/hundreds-of-horseshoe-crabs-mysteriously-dying-in-japan Yours, Paul H.
  14. 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 11, 2017. Subphylum Chelicerata Class Merostomata - Eurypterids and Xiphosurans Order Eurypterida - Sea Scorpions Suborder Eurypterina Braddy, S.J., R.J. Aldridge and J.N. Theron (1995). A New Eurypterid from the Late Ordovician Table Mountain Group, South Africa. Palaeontology, Vol.38, Part 3. Superfamily Adelophthalmoidea Family Adelophthalmidae Hannibal, J.T., et al. (2005). An Eurypterid (Adelophthalmus sp.) from a Plant-Rich Lacustrine Facies of Upper Pennsylvanian Strata in El Cobre Canyon, New Mexico.In: The Permian of Central New Mexico, Lucas, S.G., et al. (eds.), New Mexico Museum of Natural History and Science, Bulletin No. 31. Lamsdell, J.C., L. Simonetto and P.A. Selden (2013). First Eurypterid from Italy: A New Species of Adelophthalmus (Chelicerata: Eurypterida) from the Upper Carboniferous of the Carnic Alps (Friuli, NE Italy). Revista Italiana di Paleontologia y Stratigrafia, 119(2). Miller, R.F., K. Kennedy and M.R. Gibling (2012). A eurypterid from the lacustrine facies of the Early Devonian Campbellton Formation, New Brunswick, Canada. Atlantic Geology, Vol.48. Owens, R.M. and M.G. Bassett (1976). A Westphalian Eurypterid from South Wales. Palaeontology, Vol.19, Part 1. Poschmann, M. (2006). The Eurypterid Adelophthalmus sievertsi (Chelicerata: Eurypterida) from the Lower Devonian (Emsian) Klerf Formation of Willwerath, Germany. Palaeontology, Vol.49, Part 1. Tetlie, O.E. and M. Poschmann (2008). Phylogeny and Palaeoecology of the Adelophthalmoidea (Arthropoda; Chelicerata; Eurypterida). Journal of Systematic Palaeontology, 6(2). Tetlie, O.E. and P. Van Roy (2006). A reappraisal of Eurypterus dumonti Stainier, 1917 and its position within the Adelophthalmidae Tollerton, 1989. Bulletin De L'Institut Royal Des Sciences Naturelles De Belgique, Sciences De La Terre, 76. Tetlie, O.E. and J.A. Dunlop (2005). A redescription of the Late Carboniferous eurypterids Adelophthalmus granosus von Meyer, 1853 and A. zadrai Pribyl, 1992. Mitt.Mus.Nat.kd.Berl., Geowiss., Vol.8. Wills, L.J. (1964). The Ventral Anatomy of the Upper Carboniferous Eurypterid Anthraconectes Meek and Worthen. Palaeontology, Vol.7, Part 3. Superfamily Eurypteroidea Lamsdell, J.C., I. Hosgor and P.A. Selden (2012). A new Ordovician eurypterid (Arthropoda: Chelicerata) from southeast Turkey: Evidence for a cryptic Ordovician record of Eurypterida. Gondwana Research, xxx (in Press). Family Dolichopteridae Tetlie, O.E. (2007). Like Father Like Son? Not Amongst the Eurypterids (Chelicerata) from Beartooth Butte, Wyoming. J.Paleont., 81(6). Family Erieopteridae Stumm, E.C. and E.N. Kjellesvig-Waering (1962). A New Eurypterid from the Upper Silurian of Southern Michigan. Contributions from the Museum of Paleontology - The University of Michigan, Vol.XVII, Number 7. Family Eurypteridae Andrews, H.E., et al. (1974). Growth and Variation in Eurypterus remipes DeKay. Bull.geol. Instn Univ. Uppsala: N.S. 4, 6. Braddy, S.J. and J.A. Dunlop (1997). The functional morphology of mating in the Silurian eurypterid, Baltoeurypterus tetragonophthalmus (Fischer, 1839). Zoological Journal of the Linnean Society, 121. Ehlers, G.M. (1935). A New Eurypterid from the Upper Devonian of Pennsylvania.Contributions from the Museum of Paleontology - The University of Michigan, Vol. IV, Number 18. Selden, P.A. (1981). Functional morphology of the prosoma of Baltoeurypterus tetragonophthalmus (Fischer) (Chelicerata: Eurypterida). Transactions of the Royal Society of Edinburgh: Earth Sciences, 72. Tetlie, O.E. (2006). Two new Silurian species of Eurypterus (Chelicerata: Eurypterida) from Norway and Canada and the phylogeny of the genus. Journal of Systematic Palaeontology, 4(4). Tetlie, O.E. (2002). A new Baltoeurypterus (Eurypterida: Chelicerata) from the Wenlock of Norway. Norwegian Journal of Geology, Vol.82. Tetlie, O.E. and I. Rabano (2007). Specimens of Eurypterus (Chelicerata, Eurypterida) in the collections of Museo Geominero (Geological Survey of Spain), Madrid. Boletin Geologico y Minero, 118(1). Superfamily Megalograptoidea Lamsdell, J.C., et al. (2015). The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa. BMC Evolutionary Biology, 15. Superfamily Mixopteroidea (Carcinosomatoidea) Braddy, S.J., P.A. Selden and D.N. Truong (2002). A New Carcinosomatid Eurypterid from the Upper Silurian of Northern Vietnam. Palaeontology, Vol.45, Part 5. Budil, P., Š. Manda and O.E. Tetlie (2014). Silurian carcinosomatid eurypterids from the Prague Basin (Czech Republic). Bulletin of Geosciences, 89(2). Dunlop, J.A. and J.C. Lamsdell (2012). Nomenclatural notes on the eurypterid family Carcinosomatidae. Zoosyst.Evol., 88(1). Superfamily Moselopteroidea Lamsdell, J.C. (2011). The Eurypterid Stoermeropterus conicus from the Lower Silurian of the Pentland Hills, Scotland. Monograph of the Palaeontographical Society. (48.05MB download) Superfamily Pterygotioidea Family Hughmilleriidae Tetlie, O.A., P.A. Selden and R. ###### (2007). A New Silurian Eurypterid (Arthropoda: Chelicerata) from China. Palaeontology, Vol.50, Part 3. Family Pterygotidae Anderson, R.P., et al. (2014). What big eyes you have: the ecological role of giant pterygotid eurypterids. Biology Letters, 10. Anderson, R.P., et al. (2014). What big eyes you have: the ecological role of giant pterygotid eurypterids - Electronic supplementary material . Biology Letters, 10. Braddy, S.J., M.Poschmann, and O.E. Tetlie (2008). Giant claw reveals the largest ever arthropod. Biology Letters, 4. Chlupáč, I. (1994). Pterygotid eurypterids (Arthropoda, Chelicerata) in the Silurian and Devonian of Bohemia. Journal of the Czech Geological Society, 39/2-3. Chlupáč, I., et al. (1997). Early Devonian eurypterids with Bohemian affinities from Catalonia (NE Spain). Batalleria, 7. Lamsdell, J.C. and D.A. Legg (2010). An Isolated Pterygotid Ramus (Chelicerata: Eurypterida) from the Devonian Beartooth Butte Formation, Wyoming. Journal of Paleontology, 84(6). Laub, R.S. and V.P. Tollerton (2010). The Cheliceral Claw of Acutiramus (Arthropoda: Eurypterida): Functional Analysis Based on Morphology and Engineering Principles. Bulletin of the Buffalo Society of Natural Sciences, Vol. 39. Lomax, D.L., J.C. Lamsdell and S.J. Ciurca (2011). A Collection of Eurypterids from the Silurian of Lesmahagow Collected Pre 1900. The Geological Curator, 9(6). McCoy, V.E., et al. (2015). All the better to see you with: eyes and claws reveal the evolution of divergent ecological roles in giant pterygotid eurypterids. Biol.Lett., 11. Miller, R.F. (1996). Note on Pterygotus anglicus Agassiz (Eurypterida: Devonian) from the Campbellton Formation, New Brunswick. Atlantic Geology, 32. Wang, B. and Z.K. Gai (2014). A sea scorpion claw from the Lower Devonian of China (Chelicerata: Eurypterida). Alcheringa, 38. Family Slimoniidae Lomax, D.L., J.C. Lamsdell and S.J. Ciurca (2011). A Collection of Eurypterids from the Silurian of Lesmahagow Collected Pre 1900. The Geological Curator, 9(6). McCoy, V.E., et al. (2015). All the better to see you with: eyes and claws reveal the evolution of divergent ecological roles in giant pterygotid eurypterids. Biol.Lett., 11. Waterston, C.D. (1960). The Median Abdominal Appendage of the Silurian Eurypterid Slimonia acuminata (Salter). Palaeontology, Vol.3, Part 3. General Pterygotioidea Selden, P.A. (1986). A New Identity for the Silurian Arthropod Necrogammarus. Palaeontology, Vol.29, Part 3. Superfamily Waeringopteroidea Dunlop, J.A., S.J. Braddy and E. Tetlie (2002). The Early Devonian eurypterid Grossopteris overathi (Gross, 1933) from Overath, Germany. Mitt.Mus.Nat.kd.Berl., Geowiss., Vol.5. Stott, C.A., et al. (2005). A New Eurypterid (Chelicerata) from the Upper Ordovician of Manitoulin Island, Ontario, Canada. J.Paleont., 79(6). General Eurypterina Tetlie, O.E. and M.B. Cuggy (2007). Phylogeny of the Basal Swimming Eurypterids (Chelicerata; Eurypterida; Eurypterina). Journal of Systematic Palaeontology, 5(3). Suborder Stylonurina Superfamily Hibbertopteroidea (=Mycteropoidea) Lamsdell, J.C. (2012). Redescription of Drepanopterus pentlandicus Laurie, 1892, the earliest known mycteropoid (Chelicerata: Eurypterida) from the early Silurian (Llandovery) of the Pentland Hills, Scotland. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 103. Lamsdell, J.C., S.J. Braddy and O.E. Tetlie (2009). Redescription of Drepanopterus abonensis (Chelicerata: Eurypterida: Stylonurina) from the Late Devonian of Portishead, UK. Palaeontology, Vol.52, Part 5. Selden, P.A., et al. (2005). The true identity of the supposed giant fossil spider Megarachne. Biol. Lett., 1. Superfamily Kokomopteroidea Tetlie, O.E. (2008). Hallipterus excelsior, a Stylonurid (Chelicerata: Eurypterida) from the Late Devonian Catskill Delta Complex and its Phylogenetic Position in the Hardieopteridae. Bulletin of the Peabody Museum of Natural History, 49(1). Superfamily Rhenopteroidea Poschmann, M. and O.E. Tetlie (2004). On the Emsian (Early Devonian) arthropods of the Rhenish Slate Mountains: 4. The eurypterids Alkenopterus and Vinetopterus n.gen. (Arthropoda: Chelicerata). Senkenbergiana lethaea, 84(1/2). Tetlie, O.E., L.I. Anderson and M. Poschmann (2007). Kiaeropterus (Eurypterida; Stylonurina) recognized from the Silurian of the Pentland Hills. Scottish Journal of Geology, 43(1). Tetlie, O.E., et al. (2004). A New Eurypterid (Chelicerata: Eurypterida) from the Upper Devonian Gogo Formation of Western Australia, With a Review of the Rhenopteridae. Palaeontology, Vol.47, Part 4. Superfamily Stylonuroidea Kjellesvig-Wareing, E.N. (1966). A Revision of the Families and Genera of the Stylonuracea (Eurypterida). Fieldiana Geology, Vol.14, Number 9. Tetlie, O.E., L.I. Anderson and M. Poschmann (2007). Kiaeropterus (Eurypterida, Stylourina) recognized from the Silurian of the Pentland Hills. Scottish Journal of Geology, 43(1). Waterston, C.D. (1962). Pagea sturrocki Gen. et Sp.Nov., A New Eurypterid from the Old Red Sandstone of Scotland. Palaeontology, Vol.5, Part 1. General Stylonurina Lamsdell, J.C., S.J. Braddy and O.E. Tetlie (2010). The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida). Journal of Systematic Palaeontology, Vol.8, Issue 1. Lamsdell, J.C., et al. (2010). Early Devonian stylonurine eurypterids from Arctic Canada. Can.J. Earth Sci., 47. General Eurypterids Braddy, S.J. (2001). Eurypterid palaeoecology: palaeobiological, ichnological and comparative evidence for a 'mass-moult-mate' hypothesis. Palaeogeography, Palaeoclimatology, Palaeoecology, 172. Braddy, S.J. and J.A. Dunlop (2000). Early Devonian eurypterids from the Northwest Territories of Arctic Canada. Can.J. Earth Sci., 37. Burkert, C. Environment preference of eurypterids - indications for freshwater adaptation? Institute of Geology, University of Mining and Technology, Freiberg, Germany. Ciurca, S.J. (2005). Trip B-4. Eurypterids and Facies Changes Within Silurian/Devonian 'Eurypterid Beds' of New York State. New York State Geological Association 77th Annual Meeting, Oswego, NY. Clarke, J.M. and R. Ruedemann (1912). The Eurypterida of New York. Vol. I - Text. New York State Museum, Memoir 14. (Read on-line only or download individual pages.) Clarke, J.M. and R. Ruedemann (1912). The Eurypterida of New York. Vol. II - Plates. New York State Museum, Memoir 14. (Read on-line only or download individual pages.) Kjellesvig-Waering, E.N. (1963). Pennsylvanian Invertebrates of the Mazon Creek Area, Illinois. Eurypterids. Fieldiana: Geology, Vol.12, Number 6. Kjellesvig-Waering, E.N. (1961). Eurypterids of the Devonian Holland Quarry Shale of Ohio. Fieldiana: Geology, Vol.14, Number 5. Lau, K. (2009). Paleoecology and Paleobiogeography of the New York Appalachian Basin Eurypterids. Senior Thesis - Yale University. Lamsdell, J.C. and P.A. Selden (2017). From success to persistence: Identifying an evolutionary regime shift in the diverse Paleozoic aquatic arthropod group Eurypterida, driven by the Devonian biotic crisis. Evolution, 71-1. Lamsdell, J.C. and P.A. Selden (2013). Babes in the wood - a unique window into sea scorpion ontogeny. BMC Evolutionary Biology, 13. Manning, P.L. and J.A. Dunlop (1995). The Respiratory Organs of Eurypterids. Palaeontology, Vol.38, Number 2. Moelling, L.I. (2013). Eurypterid Paleoecology: Characterization and Analysis of a Late Silurian Shallow Marine Fossil Assemblage from Southern Ontario, Canada. Senior Honors Thesis - The University of Utah. Selden, P.A. Autecology of Silurian Eurypterids. Special Papers in Palaeontology, Number 32. Selden, P.A. (1985). Eurypterid respiration. Phil.Trans.R.Soc.Lond.B., 309. Størmer, L. Eurypterid Remains from the Ludlow Zone 9d of Ringerike. Norsk Geologisk Tidsskrift, 14. Tetlie, O.E. (2007). Distribution and dispersal history of Eurypterida (Chelicerata). Palaeogeography, Palaeoclimatology, Palaeoecology, 252. Tetlie, O.E., D.S. Brandt and D.E.G. Briggs (2008). Ecdysis in sea scorpions (Chelicerata: Eurypterida). Palaeogeography, Palaeoclimatology, Palaeoecology, 265. Tollerton, V.P. (1989). Morphology, Taxonomy and Classification of the Order Eurypterida Burmeister, 1843. Journal of Paleontology, Vol.63, Number 5. Vrazo, M.B. (2016). Stratigraphic and Paleoecological Controls on Eurypterid Lagerstätten in the Mid-Paleozoic. Ph.D. Dissertation - University of Cincinnatti. (260 pages) Vrazo, M.B. and S.J. Braddy (2011). Testing the 'mass-moult-mate' hypothesis of eurypterid palaeoecology. Palaeogeography, Palaeoclimatology, Palaeoecology, 311. Vrazo, M.B., C.E. Brett and S.J. Ciurca (2017). Paleoecological and stratigraphic controls on eurypterid Lagerstätten: a model for preservation in the mid-Paleozoic. Paleobiology, 43(3). Vrazo, M.B., C.E. Brett and S.J. Ciurca (2016). Buried or brined? Eurypterids and evaporites in the Silurian Appalachian basin. Palaeogeography, Palaeoclimatology, Palaeoecology, 444.Vrazo, M.B., J.M. Trop and C.E. Brett (2014). A New Eurypterid Lagerstätte from the Upper Silurian of Pennsylvania. Palaios, Vol.29. Order Xiphosura - Horseshoe Crabs Suborder Synziphosurida Anderson, L.I. and R.A. Moore (2004). Bembicosoma re-examined: a xiphosuran from the Silurian of the North Esk Inlier, Pentland Hills, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, 94. Briggs, D.E.G., et al. (2012). Silurian horseshoe crab illuminates the evolution of arthropod limbs. PNAS, Vol.109, Number 39. Eldredge, N. (1974). Revision of the Suborder Synziphosurina (Chelicerata, Merostomata), With Remarks on Merostome Phylogeny. American Museum Novitates, Number 2543. Krzeminski, W., E. Krzeminska, and D. Wojciechowski (2010). Silurian synziphosurine horseshoe crab Pasternakevia revisited. Acta Palaeontologica Polonica, 55(1). Lamsdell, J.C., J. Xue and P.A. Selden (2013). A horseshoe crab (Arthropoda: Chelicerata: Xiphosura) from the Lower Devonian (Lochkovian) of Yunnan, China. Geol.Mag., 150(2). Moore, R.A., S.C. McKenzie and B.S. Leiberman (2007). A Carboniferous Synziphosurine (Xiphosura) from the Bear Gulch Limestone, Montana, USA. Palaeontology, Vol.50, Part 4. Moore, R.A., et al. (2005). A New Synziphosurine (Chelicerata: Xiphosurida) from the Late Llandovery (Silurian) Waukesha Lagerstatte, Wisconsin, USA. J.Paleont., 79(2). Suborder Xiphosurida Anderson, L.I. and C. Horrocks (1995). Valloisella lievinensis Racheboeuf, 1992 (Chelicerata; Xiphosura) from the Westphalian B of England. N.Jb.Geol.Palaont.Mh., Vol.11. Babcock, L.E. and D.F. Merriam (2000). Horseshoe Crabs (Arthropoda: Xiphosurida) from the Pennsylvanian of Kansas and Elsewhere. Transactions of the Kansas Academy of Science, 103(1-2). Babcock, L.E., D.F. Merriam, and R.R. West (2000). Paleolimulus, an early limuline (Xiphosurida), from Pennsylvanian-Permian Lagerstatten of Kansas and taphonomic comparison with modern Limulus. Lethaia, Vol.33. Blazejowski, J. (2015). Chapter 1. The Oldest Species of the Genus Limulus from the Late Jurassic of Poland. In: Changing Global Perspectives on Horseshoe Crab Biology, Conservation and Management. Carmichael, R.H., et al. (eds.), Springer International Publishing, Switzerland. Blazejowski, J., et al. (2017). Limulitella tejraensis, a new species of limulid (Chelicerata, Xiphosura) from the Middle Triassic of southern Tunisia (Saharan Platform). Journal of Paleontology. Ewington, D.L., M.J. Clarke and M.R. Banks (1989). A Late Permian Fossil Horseshoe Crab (Paleolimulus: Xiphosura) from Poatina, Great Western Tiers, Tasmania. Papers and Proceedings of the Royal Society of Tasmania, Vol.123. Filipiak, P. and W. Krawczynski (1996). Westphalian xiphosurans (Chelicerata) from the Upper Silesia Coal Basin of Sosnowiec, Poland. Acta Palaeontologica Polonica, 41(4). Hauschke, N. and V. Wilde (2004). Palaeogene limulids (Xiphosura) from Saxony-Anhalt (Germany) - systematics and palaeobiogrography. Hallesches Jahrb.Geowiss. B, 18. Hauschke, N., V. Wilde and C. Brauckmann (2004). Triassic limulids from Madagascar - missing links in the distribution of Mesozoic Limulacea. N.Jb.Geol.Palaont.Mh., 2004(2). Holland, F.D., J.M. Erickson and D.E. O'Brien (1975). Casterolimulus: A New Late Cretaceous Generic Link in Limulid Lineage. Bull.Amer.Paleont., Vol67, Number 287. Lamsdell, J.C. and S.C. McKenzie (2015). Tachypleus syriacus (Woodward) - a sexally dimorphic Cretaceous crown limulid reveals underestimated horseshoe crab divergence times. Organisms Diversity & Evolution, 15(4). Lucas, S.G., et al. (2014). Xiphosurid fossils from the Pennsylvanian Beeman Formation, Otero County, New Mexico. New Mexico Geological Society Guidebook, 65th Field Conference, Geology of the Sacramento Mountains Region. (Thanks to Oxytropidoceras for pointing this one out!) Pickett, J.W. (1984). A New Freshwater Limuloid from the Middle Triassic of New South Wales. Palaeontology, Vol.27, Part 3. Racheboeuf, P.R., J. Vannier and L.I. Anderson (2002). A New Three-Dimensionally Preserved Xiphosuran Chelicerate from the Montceau-Les-Mines Lagerstatte (Carboniferous, France). Palaeontology, Vol.45, Part 1. Rudkin, D.M., G.A. Young, and G.S. Nowlan (2008). The Oldest Horseshoe Crab: A New Xiphosurid from Late Ordovician Konservat-Lagerstatten Deposits, Manitoba, Canada. Palaeontology, Vol.51, Part 1. Selden, P.A. and D.M. Drygant (1987). A New Silurian Xiphosuran from Podolia, Ukraine, USSR. Palaeontology, Vol.30, Part 3. Selden, P.A. and D.J. Siveter (1987). The origin of the limuloids. Lethaia, Vol.20. Siveter, D.J. and P.A Selden (1987). A new, giant xiphosurid from the lower Namurian of Weardale, County Durham. Proceedings of the Yorkshire Geological Society, Vol.46, Part 2. General Xiphosurines Anderson, L.I. (1994). Xiphosurans from the Westphalian D of the Radstock Basin, Somerset Coalfield, the South Wales Coalfield and Mazon Creek, Illinois. Proceedings of the Geologists' Association, 105. Anderson, L.I. and P.A. Selden (1997). Opisthosomal fusion and phylogeny of Palaeozoic Xiphosura. Lethaia, Vol.30. Hardy, P.G. (1970). New Xiphosurid Trails from the Upper Carboniferous of Northern England. Palaeontology, Vol.13, Part 2. Lamsdell, J.C. (2013). Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura. Zoological Journal of the Linnean Society, 167. Selden, P.A., J.C. Lamsdell and L. Qi (2015). An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China. Zoologica Scripta, 00. Wang, G. (1993). Xiphosurid Trace Fossils from the Westbury Formation (Rhaetian) of Southwest Britian. Palaeontology, Vol.36, Part 1.
  15. I've been freeze/thawing my pit 2 nods from my last trip to Mazon Creek and I've found some pretty cool stuff so far, but im wondering about these two. These are the positive impressions of two split nods. Both share a semi circular base, which leads me to believe they could be poorly preserved horseshoe crabs. I haven't found one yet, so i have nothing in-hand to compare them to. These are pretty small, and are cell phone shots, so don't hurt yourself straining your eyes too bad. Any help is appreciated! Mystery #1 Mystery #2 ...........or they could be poorly preserved trigonocarpus sp. Honestly i have no clue.....
  16. I and other members will be heading to Fossil Rock campground to hunt pit 2 on Sunday October 19th 2014. Hopefully the weather will corporate and we can get our buckets filled! Come and join us. It doesn't matter if you've never done it before, i will be happy to teach you what to look for and how to be successful in your 300mya scavenger hunt. We will meet at the Shell gas station in Coal City @ 8-8:30am. It's just west of rt.55 on 113. Hopefully this link will help http://goo.gl/maps/z6m7q Supplies you need and may want. -shovel, pickaxe, rockhammer (basically a good and sturdy digging device). We will be digging through hard shale. -a pair of gloves to keep from collecting blisters -a pair of extra clothes and boots/shoes definitely helps on the ride home. -a bucket, backpack, rock bag (anything that will handle about 5lbs-50lbs worth of rocks) -water is a must, water, water, water -snacks and food is up to you -hiking boots, old pair of shoes, etc. They will get dirty. -i would say bug spray, but being so late in the year hopefully they won't be too crazy. -also it's $5 a person to dig at the campground. This pit is great for very well preserved plants, wood, insects and horseshoe crabs. I have found some awesomely preserved stuff there. These are some of the hardest nodules you will collect anywhere in the Mazon Creek area, and sometimes they take over 30+ freeze/thaw cycles to pop. As i stated above, we WILL be digging, so eat your Wheaties. You can hike around and try and surface collect, but since the spoil piles aren't that tall it may be a waste of time. Here's a live weather link to check the weather for that day. http://m.accuweather.com/en/us/coal-city-il/60416/weather-forecast/332818 Hope to see you there!
  17. Id Confirmation

    Found this beautiful specimin in the cessnock area I'm thinking horseshoe crab
  18. Horseshoe Crab Legs?

    Hi all, I recently found this upper carb Belinurus from the uk which looks like it has preservation of the legs. It is crushed flat and split from the underside, has anyone got any other specimens for comparison? Regards Neil.
  19. Its Not A Eurypterid

    I was at my usual site near Niagara Falls hunting eurypterids on Friday with two other collecting friends from the USA and although it was not a great day for eurypterids, the day turned out pretty good. As far as eurypterids go all I found was the following specimen but it has excelent paddle preservation that is folded over the body like an egyptian mummy. The coxa from the underside are also folded over and visible which is very unusual for a dorsally preserved specimen. What turned out to be the find of the day was that I found a horseshoe crab. As a pleasant surprise Peter from the forum( Pleecan) showed up just as I found this. Which was fortunate for me as after he ate his lunch he got out his rock and cut both of these out for me. I also have the counterpart to the crab but have not got a picture of it at this point, it is still in the trunk of my car. This is an order of magnitude rarer than the eurypterids at this site. I am aware of about 50 eurypterids collected this year that were over 80% complete. I am only aware of this and one other horseshoe crab being found this year. The following pictures were taken in situ by a well known and respected collector at this site Sam and are quite hard to see. (Perhaps Peter will do some magic and post an enhanced version.) I was actually quite surprised to have noticed it. It was about 1 foot from the partial eurypterid that is shown above. It was on the same bedding plane as the eurypterid about 1 foot to the southwest. . This was found in the Williamsville A formation of the Bertie waterlime. So the age is Upper Silurian At about 35 millimeters in length I am told that it is very large for this location where they are more normally 10 to 15 millimeters in size. My assumption at this point is that it is a Pseudoniscus clarkie Technically it is probably not correct to call it a horseshoue crab. Any other thoughts...... I have also heard of these called bunaia woodwardi but some believe these to be the same species. They are listed as separate in my book Fossil Ecosystems of North America.