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Found 38 results

  1. ? Productus moorefieldanus Girty

    From the album Invertebrates

    ? Productus moorefieldanus Girty Early Carboniferous Heath Shale Formation Bear Gulch Fergus County Montana USA
  2. Caridosuctor populosum Lund & Lund, 1984

    From the album Vertebrates

    Caridosuctor populosum Lund & Lund, 1984 Heath Shale Formation Early Carboniferous Serpukhovian Bear Gulch Montana USA
  3. Reticycloceras sp.

    With soft part preservation. Lit.: Landman, N. H., and R. A. Davis, 1988. "Jaw and crop preserved in an orthoconic nautiloid cephalopod from the Bear Gulch Limestone (Mississippian, Montana)." Mapes, R. S. 1987. "Upper Paleozoic cephalopod mandibles: frequency of occurrence, modes of preservation, and paleoecological implications". Journal of Paleontology 61: 521-538.
  4. Can also be found in Mazon Creek. Lit.: F. R. Schram (1979): Worms of the Mississippian Bear Gulch Limestone of central Montana, USA. Transactions of the San Diego Society of Natural History. Volume 19, No 9, pp 107-120
  5. Carboniferous fish of the USA

    LUND The new Actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA) Richard LUND GEODIVERSITAS • 2000 • 22 (2)
  6. Reticycloceras sp.

    From the album Invertebrates

    Reticycloceras sp. Early Carboniferous Serpukhovian Heath Shale Formation Bear Gulch Montana USA
  7. Janvier, P. & Lund, R. 1983 – Hardistiella montaniensis from the Lower Carboniferous of Montana with remarks on the affinity of the lampreys. J. Vert. Paleont. 2, 407-413. Janvier, P. & Lund, R. 1986 – A second lamprey from the Lower Carboniferous of Bear Gulch Montana. Geobios 19, 647-652. Robert S. Sansom, Sarah E. Gabbott, and Mark A. Purnell Decay of vertebrate characters in hagfish and lamprey (Cyclostomata) and the implications for the vertebrate fossil record Proc. R. Soc. B. 2011 278 1709 1150-1157
  8. Palaeoniscidae indet

    From the album Vertebrates

    Palaeoniscidae indet. "Bigeye" Early Carboniferous Serpukhovian Heath Shale Formation Bear Gulch Fergus County Montana USA
  9. Taken from Lund, Richard, and Grogan, E.D., 2005, Bear Gulch web site, www.sju.edu/research/bear_gulch, 14/11/2016, page last updated 2/1/2006: "Heteropetalus elegantulus is an elegantly slim little euchondrocephalan with many different tooth shapes along its jaws. It ranges to only about 4 inches in length. Skull, jaws, and dentition place it close to Debeerius. It is common in the weedier shallow water areas. Male (top) and female (bottom). There are no scales, except for a small patch at the rear of the dorsal fin of males. Lateral line canals of the head are supported by rather large highly modified scales. Heteropetalus has an almost eel-like body, a protocercal tail, rounded and very flexible pectoral fins midway up the sides of the body, and a single long flexible undulatory dorsal fin (preceded by a small fin spine). All these features indicate a maneuverer in weedy or reef-like environments as well as along the bottom. Mature males have a distinctly strengthened, hooked and denticulated posterior end of the dorsal fin; the dorsal fin of males was significantly higher than that of females. This dorsal fin dimorphism is similar to that seen in the Gouramies, modern bony tropical fish available in any pet store. Dorsal view of Heteropetalus elegantulus head They have a very small mouth, with the teeth crowded to the front of the jaws, and a variety of plucking, nipping, and crunching teeth. The jaw suspension itself is rather flexible to give it a certain amount of both lateral and fore-and-aft motion. The bright yellow spots in the dorsal view of a head are the inner ears, and the yellow is from iron oxide particles that were bio-concentrated during the life of this fish. H. elegantulus was originally described as a petalodont, but subsequent discoveries proved it to be otherwise; it is closely related to Debeerius ellefseni." This fish is clearly a male as shown by the claspers. Lit.: Lund, R. 1977 - A new petalodont (Chondrichthyes, Bradyodonti) from the Upper Mississippian of Montana. Annals of Carnegie Museum, 46 (19): 129-155. Grogan E.D. & Lund, R. (2000): Debeerius ellefseni (Fam. Nov., Gen. Nov., Spec. Nov.), an autodiastylic chondrichthyan from the Mississippian Bear Gulch Limestone of Montana (USA), the relationships of the Chondrichthyes, and comments on gnathostome evolution. Journal of Morphology, 243 (3): 219-245.
  10. Salpidae indet.

    Picture of the recent Pyrosoma atlanticum provided by Show_ryu - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15193539 Lit.: CUOMO, C., ROSBACH, S. and BARTHOLOMEW, P. (2015): INVERTEBRATES OF THE UPPER MISSISSIPPIAN BEAR GULCH LIMESTONE – A TALE OF JELLIES AND TUNICATES ? 2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015), Paper No. 327-5
  11. Lit.: Lund R. & Poplin C. 2000. — Two new deep-bodied Actinopterygians from Bear Gulch, (Montana, USA, Lower Carboniferous). Journal of Vertebrate Paleontology 20: 428-449. Fossil Fishes of Bear Gulch
  12. Lit.: R. Lund and W. G. Melton Jr. 1982. A new actinopterygian fish from the Mississippian Bear Gulch limestone of Montana. Palaeontology 25(3):485-498 R. Lund and C. Poplin 2002. Cladistic analysis of the relationships of the Tarrasiids (Lower Carboniferous Actinopterygians). Journal of Vertebrate Paleontology 22:480-486
  13. Lit.: EDWIN K. MAUGHAN and ALBERT E. ROBERTS (1967): Big Snowy and Amsden Groups and the Mississippian-Pennsylvanian Boundary in Montana. GEOLOGICAL SURVEY PROFESSIONAL PAPER 554 7 B Lutz-Garihan, A.B. (1979). Brachiopods from the Upper Mississippian Bear Gulch Limestone of Montana. Neuvieme Congres International de Stratigraphie et de Geologie du Carbonifere. Compte Rendu Vol. 5: 457-467 pp. EDIT: Subperiod is Mississippian and Epoch is Late.
  14. Lit.: Lund R. & Poplin C. 1997. — The Rhadinichthyids (Palaeoniscoid, Actinopterygians) from the Bear Gulch Limestone of Montana (USA, Lower Carboniferous). Journal of Vertebrate Paleontology 17: 466-486.
  15. Yogoniscus gulo Lowney, 1980

    Lit.: Lowney, K. A. 1980.* Certain Bear Gulch (Namurian A, Montana) Actinopterygii (Osteichthyes) and a reevaluation of the evolution of the Paleozoic actinopterygians. Ph.D. thesis, New York Univ., October 1980: 489 p
  16. Lingula sp.

    Lit.: Lutz-Garihan, A. B. 1985. "Brachiopods from the Upper Mississippian Bear Gulch Limestone of Montana." Compte Rendu, Neuvième Congrès International de Stratigraphie et de Géologie du Carbonifère, 5: 457-467.
  17. Taken from Lund, Richard, and Grogan, E.D., 2005, Bear Gulch web site, www.sju.edu/research/bear_gulch, 14/11/2016, page last updated 2/1/2006: "Heteropetalus elegantulus is an elegantly slim little euchondrocephalan with many different tooth shapes along its jaws. It ranges to only about 4 inches in length. Skull, jaws, and dentition place it close to Debeerius. It is common in the weedier shallow water areas. Male (top) and female (bottom). There are no scales, except for a small patch at the rear of the dorsal fin of males. Lateral line canals of the head are supported by rather large highly modified scales. Heteropetalus has an almost eel-like body, a protocercal tail, rounded and very flexible pectoral fins midway up the sides of the body, and a single long flexible undulatory dorsal fin (preceded by a small fin spine). All these features indicate a maneuverer in weedy or reef-like environments as well as along the bottom. Mature males have a distinctly strengthened, hooked and denticulated posterior end of the dorsal fin; the dorsal fin of males was significantly higher than that of females. This dorsal fin dimorphism is similar to that seen in the Gouramies, modern bony tropical fish available in any pet store. Dorsal view of Heteropetalus elegantulus head They have a very small mouth, with the teeth crowded to the front of the jaws, and a variety of plucking, nipping, and crunching teeth. The jaw suspension itself is rather flexible to give it a certain amount of both lateral and fore-and-aft motion. The bright yellow spots in the dorsal view of a head are the inner ears, and the yellow is from iron oxide particles that were bio-concentrated during the life of this fish. H. elegantulus was originally described as a petalodont, but subsequent discoveries proved it to be otherwise; it is closely related to Debeerius ellefseni." Lit.: Lund, R. 1977 - A new petalodont (Chondrichthyes, Bradyodonti) from the Upper Mississippian of Montana. Annals of Carnegie Museum, 46 (19): 129-155. Grogan E.D. & Lund, R. (2000): Debeerius ellefseni (Fam. Nov., Gen. Nov., Spec. Nov.), an autodiastylic chondrichthyan from the Mississippian Bear Gulch Limestone of Montana (USA), the relationships of the Chondrichthyes, and comments on gnathostome evolution. Journal of Morphology, 243 (3): 219-245.
  18. Anthracoceras sp.

    The dark spot in the living chamber is either thought to be an ink sac or a beak and radula. Lit.: Doguzhaeva, L., Mapes, R. and Mutvei, H. (2007):Beaks and radula of Early Carboniferous goniatites. Lethaia 30(4):305 - 313
  19. Lit.: Frederick R. Schram & John Horner (1978). "Crustacea of the Mississippian Bear Gulch Limestone of Central Montana". Journal of Paleontology 52 (2): 394–406.
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