Zone 1, Yorktown Fm - Schmidts Bluff: Pliocene, Virginia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Turritellidae
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Turritella variabilis
Conrad 1830
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| recombined as Turritella (Torcula) variabilis | ||||||||||
| Subspecies: T. variabilis pilsbryi | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Pecten jeffersonius
Say 1824
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| recombined as Chesapecten jeffersonius | ||||||||||
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Pecten eboreus
(Conrad 1833)
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| recombined as Carolinapecten eboreus | ||||||||||
| Subspecies: Pecten eboreus watsonensis | ||||||||||
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Pecten clintonius
Say 1824
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| recombined as Placopecten clintonius | ||||||||||
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Bivalvia
- Ostreida
- Malleidae
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Pedalion maxillatum
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Bivalvia
- Arcida
- Glycymerididae
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Glycymeris subovata
(Say 1824)
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| recombined as Costaglycymeris subovata | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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Venus rileyi
Conrad 1838
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| recombined as Mercenaria campechiensis rileyi | ||||||||||
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Bivalvia
- Cardiida
- Mactridae
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Spisula confraga
(Conrad 1833)
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Bivalvia
- Pholadida
- Teredinidae
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Kuphus calamus
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Bivalvia
- Lucinida
- Lucinidae
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Phacoides (Pseudomiltha) anodonta
(Say 1824)
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| recombined as Stewartia anodonta | ||||||||||
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Bivalvia
- Carditida
- Carditidae
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Venericardia granulata
Say 1824
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| recombined as Cyclocardia granulata | ||||||||||
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Bivalvia
- Carditida
- Astartidae
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Astarte exaltata
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Astarte undulata
Say 1824
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| recombined as Astarte (Ashtarotha) undulata | ||||||||||
| Subspecies: A. undulata deltoides and A. undulata varginulata | ||||||||||
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unclassified
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Crassatellites undulatus
(Say 1824)
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| synonym of Kalolophus antillarum | ||||||||||
| Subspecies: C. undulatus cyclopterus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Surry |
| Coordinates: | 37.2° North, 77.0° West (view map) | ||||
| Paleocoordinates: | 37.3° North, 76.1° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Pliocene |
| 10 m.y. bin: | Cenozoic 6 | ||
| Key time interval: | Pliocene | ||
| Age range of interval: | 5.33300 - 2.58000 m.y. ago |
Stratigraphy
| Formation: | Yorktown | Member: | Zone 1 | ||
| Local section: | Schmidts Bluff | ||||
| Regional section: | James River | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Yorktown Formation, zone 1. Contact with underlying bed is evident but not very regular. Unit is 8 ft thick. | |||||
Lithology and environment
| Primary lithology: | medium,brown,gray unlithified sandstone |
| Includes fossils? | Y |
| Lithology description: Medium-grained gray to buff sands. | |
| Environment: | coastal indet. |
| Geology comments: Shallow water siliciclastic setting. No specific environmental data provided in text. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | general faunal/floral analysis |
| Collection method comments: Material from this locality are reposited in USNM and Wagner Free Inst. Sci. | |
| Taxonomic list comments:Not exhaustive, and slightly antiquated nomenclature, though with species-level designations. Only Bivalvia and Gastropoda listed. | |
Metadata
| Database number: | 59293 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-03-25 11:18:44 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2006-03-25 11:18:44 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 16984. | J. A. Gardner. 1943. Mollusca from the Miocene and Lower Pliocene of Virginia and North Carolina. Part 1. Pelecypoda. United States Geological Survey Professional Paper 199(A):1-178 [A. Miller/A. Hendy/S. Ávila] |