Horsehead Cliffs, Zone 12-13: Langhian, Virginia
collected by C. T. Berry, W. G. Lynn 1935
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Carnivora
- Phocidae
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Leptophoca lenis
True 1906
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Uhen 2007 | 1 specimen | ||||||||
| synonym of Leptophoca proxima | ||||||||||
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Mammalia
- Cetacea
- Eurhinodelphinidae
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cf. Eurhinodelphis sp.
Van Beneden and Gervais 1880
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Uhen 2007 | |||||||||
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Reptilia
- Testudines
- Cheloniidae
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Peritresius virginianus n. sp.
Berry and Lynn 1936
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Berry and Lynn 1936 | |||||||||
| synonym of Syllomus aegyptiacus | ||||||||||
| (1 measurement) | ||||||||||
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Syllomus crispatus
Cope 1896
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Reptilia
- Charadriiformes
- Alcidae
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Miocepphus mcclungi
Wetmore 1940
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Wijnker and Olson 2009 | 1 specimen | ||||||||
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Reptilia
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Gavialosuchus antiquus
Leidy 1852
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Uhen 2007 | 1 specimen | ||||||||
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= Thecachampsa antiquus
Leidy 1852
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Weems 2018 | |||||||||
| original and current combination Crocodilus antiquus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Westmoreland |
| Coordinates: | 38.2° North, 76.9° West (view map) | ||||
| Paleocoordinates: | 38.4° North, 73.6° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Langhian | 10 m.y. bin: | Cenozoic 5 |
| *Period: | Tertiary | *Epoch: | Early/Lower - Middle Miocene - Late/Upper Miocene |
| Key time interval: | Langhian | ||
| Age range of interval: | 15.98000 - 13.82000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Chesapeake | Formation: | Calvert | Member: | Plum Point |
| Regional section: | Shattuck | Regional bed: | 12-13 | ||
| Regional order: | bottom to top | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Peritresius virginianus type specimen is from "about four feet above the beach level" and the other fossils are from "about seven feet" above it. Author lists this cliff as having exposures of Calvert, Choptank and St. Mary's Formations | |||||
Lithology and environment
| Primary lithology: | diatomaceous,gray,blue claystone |
| Includes fossils? | Y |
| Lithology description: blue-gray diatomaceous clay | |
| Environment: | estuary/bay |
| Geology comments: sparse molluscs, low in diversity; subtropical environment in embayment and dry onshore; area not far from shore
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Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Associated major elements: | some |
| Disassociated major elements: | some |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | C. T. Berry, W. G. Lynn | Collection dates: | 1935 |
| Taxonomic list comments:referred P. virginianus specimen is from "about 0.4 mile south" of the type locality | |||
Metadata
| Also known as: | Westmoreland State Park | ||
| Database number: | 28368 | ||
| Authorizer: | J. Alroy, M. Uhen | Enterer: | E. Leckey, M. Uhen |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2003-02-10 17:50:48 | Last modified: | 2022-03-03 04:12:14 |
| Access level: | the public | Released: | 2003-02-10 17:50:48 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 7804. | 5% 48380 | C. T. Berry. 1937. More complete remains of a chelonian, Syllomus crispatus Cope, from the Miocene of Virginia. American Museum Novitates 953:1-19 [J. Alroy/E. Leckey/E. Leckey] |
Secondary references:
| 34382 | C. T. Berry and W. G. Lynn. 1936. A new turtle, Peritresius virginianus, from the Miocene of Virginia. Proceedings of the American Philosophical Society 76(2):175-190 [J. Alroy/J. Alroy] | |
| 24251 | M. D. Uhen. 2007. USNM Chesapeake Group Cetacean Collection Data. [M. Uhen/M. Uhen] | |
| 32709 | L. W. Ward and G. W. Andrews. 2008. Stratigraphy of the Calvert, Choptank, and St. Marys Formations (Miocene) in the Chesapeake Bay Area, Maryland and Virginia. Virginia Museum of Natural History Memoir 1-169 [M. Uhen/M. Uhen] | |
| 23900 | R. E. Weems. 2018. Crocodilians of the Calvert Cliffs. Smithsonian Contributions to Paleobiology 100:213-240 [J. Alroy/J. Alroy/M. Uhen] | |
| 29991 | E. Wijnker and S. L. Olson. 2009. A revision of the fossil genus Miocepphus and other Miocene Alcidae (Aves: Charadriiformes) of the western North Atlantic Ocean. Journal of Systematic Palaeontology 7(4):471-487 [M. Uhen/M. Uhen/M. Uhen] |