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Showing results for tags 'rhynchonellata'.
Found 8 results
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I am fortunate enough to have such a huge amount of Middle Devonian Givetian material that I thought it best to put the older Middle Devonian stage, the Eifelian, in its own thread. There are some spectacular fossils here as well though! I thought a good place to start would be in the Formosa Reef, which I believe is quite early Eifelian. This tabulate coral and stromatoporoid reef continues similar complexes found from the Middle Silurian, see my: https://www.thefossilforum.com/topic/84678-adams-silurian/page/3/ thread from page three onwards for details. All these Formosa Reef specimens come from a delightful gift from my good friend @Monica who is a tad busy with life at the moment but is fine and still thinking of the forum. This outcrop can be found on Route 12 near Formosa/Amherstburg, Bruce County, Ontario, Canada. This beautiful-looking specimen came to me with only a third of it revealed but I managed to get it this far after nine days of painful pin prepping. Monica found another one and posted it for ID here: https://www.thefossilforum.com/topic/105528-weird-circular-imprints-formosa-reef-lower-devonian/#comment-1172285 The specimen was identified by another Canny Canadian @Kane to be the little stromatoporoid sponge Syringostroma cylindricum. Hardly a reef-builder, but gorgeous nonetheless. It does have a little thickness to it, but not much. Beautiful! Pretty thin, actually. I love this Monica, thank you!
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- acanthopyge
- acanthopyge contusa
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Found as surface float on the scree pile at the Windom exposure. A very common fossil in Hamilton group sediments. Similar to Emanuella praeumbona, distinguished from E. praeumbona by the hinge width; the hinge of A. umbonata spans the width of the valve, while that of E. praeumbona is narrower. A. umbonata has a nearly flat brachial valve, while that of E. praeumbona shows a convex profile. Full-sized specimens of A. umbonata are also not as large as E. praeumbona. References: Wilson, K. A. “Field Guide to the Devonian Fossils of New York” (2014). Paleontological Research Institution Special Publication No. 44. Linsley, D. M. “Devonian Paleontology of New York” (1994). Paleontological Research Institution Special Publication No. 21. Hall, J. Palaeontology of New York v. 4. (1867) Fossilworks. http://fossilworks.org
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- a. umbonata
- ambocoelia
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Found as surface float near the top of the Windom exposure, a few feet below the Genundewa Limestone at Penn-Dixie Quarry in Hamburg, NY. A very common fossil in Hamilton Group sediments. Similar to Emanuella praeumbona, distinguished from E. praeumbona by the hinge width; the hinge of A. umbonata spans the width of the valve, while that of E. praeumbona is narrower. A. umbonata has a nearly flat brachial valve, while that of E. praeumbona shows a convex profile. Full-sized specimens of A. umbonata are also not as large as E. praeumbona. Originally designated Orthis umbonata. A. umbonata has been defined as the type species of Ambocoelia by Hall. References: Wilson, K. A. “Field Guide to the Devonian Fossils of New York” (2014). Paleontological Research Institution Special Publication No. 44. Linsley, D. M. “Devonian Paleontology of New York” (1994). Paleontological Research Institution Special Publication No. 21. Hall, J. Palaeontology of New York v. 4. (1867) Fossilworks. http://fossilworks.org
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- a. umbonata
- ambocoelia
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Found as surface float near the top of the Windom exposure, a few feet below the Genundewa Limestone at Penn-Dixie Quarry in Hamburg, NY. Distinguished from Ambocoelia umbonata by the hinge width; the hinge of A. umbonata spans the width of the valve, while that of E. praeumbona is narrower. E. praeumbona also shows a convex profile to the brachial valve, and grew to a larger size. E. praeumbona is common in the Hamilton Group only within the upper layers of the Windom Member. Originally designated Orthis praeumbona, later assigned to Ambocoelia, then reassigned to Emanuella in 1990. References: Hall, J. Palaeontology of New York v. 4. (1867) Fossilworks. http://fossilworks.org Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology) Brett, C. E. Biostratigraphy and Paleoecology of the Windom Shale Member (Moscow Formation) in Erie County, NY. 1974. State University of New York at Buffalo.
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Found as surface float on the scree pile at the Windom exposure. Originally assigned to Rhynchonella prolifica, currently assigned to Camarotoechia. Appears to have been assigned to several genera over time, including Stenocisma and Cupularostrum. Refs: Linsley, D. M. Devonian Paleontology of New York. (1994) Paleontological Research Institution Special Publication 21. Hall, J. Palaeontology of New York v. 4. (1867) Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)
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Found as surface float on the scree pile at the Windom exposure. Refs: Linsley, D. M. “Devonian Paleontology of New York” (1994). Paleontological Research Institution Special Publication No. 21. Hall, J. Palaeontology of New York v. 4. (1867) Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)
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Found as surface float on the scree pile at the Windom exposure. Possible undescribed species of genus Cyrtina. Closely resembles C. hamiltomensis, but surface is smooth and punctate, rather than covered in tiny spicules. Also differs in that extremities are slightly rounded, rather than squared, and height of interarea is equal to the width rather than smaller. References: Ehlers, G. M. Cyrtina Hamiltonensis (Hall) And A New Species Of This Brachiopod Genus From New York. Contributions From The Museum Of Paleontology The University Of Michigan Vol. XVIII, No. 12, pp. 197-204 (1963). Linsley, D. M. Devonian Paleontology of New York. (1994) Paleontological Research Institution Special Publication 21. Wilson, K. A. Field Guide to the Devonian Fossils of New York. (2014) Paleontological Research Institution Special Publication 44. Hall, J. Palaeontology of New York v. 4. (1867) Fossilworks. http://fossilworks.org Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)
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Found as surface float on the scree pile at the Kashong exposure. Originally assigned to Delthyris, reassigned to Spirifer, Acrospirifer, and Patriaspirifer. Alternate spellings: P. duodenaris, P. duodenaria, P. duodenarius. Does not appear in Fossilworks or Wilson’s “Field Guide to the Devonian Fossils of New York”. Classification information from Fossilworks entry for Patriaspirifer genus. Reference: Linsley, D. M. Devonian Paleontology of New York. (1994) Paleontological Research Institution Special Publication 21. Hall, J. Palaeontology of New York v. 4. (1867) Fossilworks. http://fossilworks.org Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)
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- brachiopod
- devonian
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