Popes Creek (Johns Hopkins collection): Ypresian, Maryland
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chondrichthyes
- Lamniformes
- Otodontidae
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Odontaspis macrota
(Agassiz 1838)
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Leriche 1942 | |||||||||
| original and current combination Otodus macrotus | ||||||||||
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Chondrichthyes
- Lamniformes
- Lamnidae
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Carcharodon sp.
Smith 1838
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Leriche 1942 | |||||||||
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Chondrichthyes
- Myliobatiformes
- Aetobatidae
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Aetobatis irregularis
Agassiz 1843
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Leriche 1942 | |||||||||
| recombined as Aetobatus irregularis | ||||||||||
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Bivalvia
- Carditida
- Carditidae
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Venericardia (Venericor) ascia
(Rogers 1839)
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Palmer and Brann 1965 | |||||||||
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Cephalopoda
- Nautilida
- Hercoglossidae
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Hercoglossa tuomeyi n. sp.
Clark and Martin 1901
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Cimomia marylandensis n. sp.
Miller and Thompson 1933
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Miller 1947 | |||||||||
| Part of Hercoglossa tuomeyi Clark & Martin (1 measurement) | ||||||||||
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Gastropoda
- Turritellidae
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Turritella potomacensis
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Palmer and Brann 1965 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Maryland | County: | Charles |
| Coordinates: | 38.4° North, 77.0° West (view map) | ||||
| Paleocoordinates: | 38.8° North, 61.1° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Ypresian | ||
| Age range of interval: | 56.00000 - 47.80000 m.y. ago |
Stratigraphy
| Geological group: | Pamunkey | Formation: | Nanjemoy | Member: | Woodstock |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Woodstock Greensand Marl Mbr of the Nanjemoy Fm, Pamunkey Gp. Eocene, according to Miller (1947); Early Eocene, according to Ward (1985). STRATIGRAPHIC POSITION: From upper part of member. | |||||
Lithology and environment
| Primary lithology: | very fine,glauconitic,micaceous,black,green poorly lithified silty sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Sand, olive-black (5 Y 2/1), very fine, silty, micaceous, well-sorted, very glauconitic; numerous well-preserved mollusks; upper contact sharp and burrowed; burrows extend as much as 3 feet downward. LITHIFICATION: Poorly ;ithified, based on facies description and figured specimens. | |
| Environment: | transition zone/lower shoreface |
| Geology comments: ENVIRONMENT: The larger, diverse molluscan fauna in the Woodstock, compared with the nondiverse Potapaco assemblages, suggest a return to more open-marine, shallow-shelf conditions (Ward, 1985). The foraminiferal assemblages indicate an inner sublittoral paleoenvironment with water depths of about 20-40 m during deposition of the lower and middle parts of the unit and an inner sublittoral (40-60 m) environment with firm, sandy substrates during deposition of the upper part. The abundance of Turrilina and Fursenkoina, which are among the predominant benthic genera in the middle part of the unit, suggests waters containing lower than normal dissolved oxygen. The somewhat coarser, much more lignitic, pebbly sands of the Woodstock, the relatively shallow water depths, and the microfauna suggest a perideltaic environment. Dinocyst assemblages throughout the Nanjemoy in the Haynesville cores are dominated by peridiniacean taxa and thus represent predominantly estuarine to inner neritic environments. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | poor |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: COLLECTORS: Unknown collector. REPOSITORY: Johns Hopkins University. | |
| Taxonomic list comments:COVERAGE: Limited to Nautiloidea described in primary publication. NOMENCLATURE: Authoritative publication with modern nomenclature and species-resolution identifications. | |
Metadata
| Database number: | 81880 | ||
| Authorizer: | A. Hendy, M. Clapham, M. Uhen | Enterer: | A. Hendy, M. Uhen, M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2008-07-17 13:44:47 | Last modified: | 2019-09-09 23:16:59 |
| Access level: | the public | Released: | 2008-07-17 13:44:47 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 54246. | W. B. Clark and G. C. Martin. 1901. Mollusca. Maryland Geological Survey, Eocene 122-203 [M. Clapham/M. Clapham] |
Secondary references:
| 28099 | M. Leriche. 1942. Contribution a l'etude des faunes ichthyologiques marines des terrains tertiaires de la plaine cotiere Atlantique et du centre des Etats-Unis. Memoires de la Societe Geologique de France (Nouvelle Serie) 45:1-111 [M. Uhen/M. Uhen] | |
| 27587 | A. K. Miller. 1947. Tertiary nautiloids of the Americas. Geological Society of America Memoir 23:1-234 [A. Hendy/A. Hendy] | |
| 11845 | K. V. Palmer and D. C. Brann. 1965. Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Peteropoda, Scaphopoda and Cephalopoda. Bulletins of American Paleontology 48:1-471 [M. Kosnik/M. Kosnik/J. Alroy] |