Isle La Motte, Division C, Valcour Fm: Chazyan, Vermont
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rostroconchia
- Conocardiida
- Bransoniidae
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Conocardium beecheri
Raymond 1905
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Raymond 1906 | ||||||
| recombined as Pojetaconcha beecheri | |||||||
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Cephalopoda
- Bisonocerida
- Proterovaginoceratidae
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Perkinsoceras foerstei n. sp.
Flower 1976
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Flower 1976 | ||||||
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Cephalopoda
- Endocerida
- Endoceratidae
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Vaginoceras oppletum
Ruedemann 1906
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Cameroceras curvatum
Ruedemann 1906
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Cephalopoda
- Oncocerida
- Oonoceratidae
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Oonoceras lativentrum
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Cephalopoda
- Oncocerida
- Valcouroceratidae
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Cameroceras tenuiseptum
(Ruedemann 1906)
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| recombined as Valcouroceras tenuiseptum | |||||||
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Oonoceras seelyi
Ruedemann 1906
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| recombined as Valcouroceras seelyi | |||||||
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Gastropoda
- Bellerophontida
- Bucaniidae
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Bucania sulcatina
(Emmons 1842)
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Raymond 1906 | ||||||
| original and current combination Bellerophon sulcatinus | |||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Vermont |
| Coordinates: | 44.9° North, 73.3° West (view map) | ||
| Paleocoordinates: | 28.0° South, 54.6° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician |
| 10 m.y. bin: | Ordovician 2-4 |
| Key time interval: | Chazyan |
| Age range of interval: | 470.00000 - 457.00000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | lithified "limestone" |
| Lithology description: Details of the divisions at each of the localities from which each specimen listed are not given, thus I will give a complete description of lithologies summarized by Ruedemann for the formation at two different localities. “Section of the Chazy beds at Valcour in ascending order: The Chazy beds at Valcour form a low anticline. B1, a hard, compact, gray limestone, exposed at water edge, on land of Ezra Day. 2 feet of its top exposed. B2, same rock. 6 inches. B3, gray, shaly impure limestone with mud seams; very fossiliferous. 1 foot 4 inches. B4, more crystalline limestone with darker shaly intercalations. 1 foot 10 inches. Contains numerous small bryozoan reefs and other fossils; also many cephalopods in its upper layer (just north of fence diving lands of George and Ezra Day). B5, darker, impure shaly limestone. 1 foot 6 inches. Contains some large nautiloids. B6, a gray shaly limestone, 3 feet, containing a rich fauna (Bolboporites, Malocystites, brachipods, trilobites). B7, series of heavier, dark gray beds with abundant plates of Palaocystites. 7a-10 inches, barren; 7b-14 inches, in lower 3 inches full of trilobites; 7c-3 feet 6 inches, barren; 7c2-8 inches, hard crystalline gray limestone with trilobites. B8, 5 ½ feet of dark shaly limestone, nearly bluish gray and very fossiliferous, containing orthoceracones. Since we can do no better than base our future stratigraphic work on the larger lithologic divisions recognized by Brainerd and Seely in the Beekmantown formation at East shore ham Vt. And in the Chazy formation at Chazy village, we refer the fossils obtained at other places than the Valcour shore provisionally to those divisions.” | |
| Environment: | carbonate indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 42814 | ||
| Authorizer: | P. Wagner | Enterer: | K. Koverman, P. Wagner |
| Modifier: | B. Kröger | Research group: | marine invertebrate |
| Created: | 2004-08-05 13:52:52 | Last modified: | 2024-03-31 19:20:59 |
| Access level: | the public | Released: | 2004-08-05 13:52:52 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 11371. | 1% | R. Ruedemann. 1906. Cephalopoda of the Beekmantown and Chazy formations of the Champlain Basin. Bulletin of the New York State Museum, Paleontology 14:389-611 [P. Wagner/K. Koverman/M. Uhen] |
Secondary references:
| 87425 | R. H. Flower. 1976. Some Whiterock and Chazy endoceroids. New Mexico Bureau of Geology & Mineral Resources, Memoir 28:13-38 [P. Wagner/P. Wagner] | |
| 15149 | P. E. Raymond. 1906. The Chazy Formation and its fauna. Annals of the Carnegie Museum 3(4):498-596 [P. Wagner/P. Wagner] |