Molluscan Zone 10 (Unit A), Little Cove Point Mbr, St. Marys Fm - Langleys Bluff: Late/Upper Miocene, Maryland
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
unclassified
|
||||||||||
|
Busycotyphus coronatum
|
||||||||||
|
Busycotyphus rugosum
|
||||||||||
|
Gastropoda
- Neogastropoda
- Terebridae
|
||||||||||
|
Terebra simplex
Conrad 1830
|
||||||||||
| recombined as Laevihastula simplex | ||||||||||
|
Gastropoda
- Neogastropoda
- Nassariidae
|
||||||||||
|
Nassarius (Tritiaria) peralta
(Conrad 1868)
|
||||||||||
|
Gastropoda
- Turritellidae
|
||||||||||
|
Turritella plebeia
Say 1824
|
||||||||||
| recombined as Mariacolpus plebeia | ||||||||||
| Subspecies: T. plebeia plebeia | ||||||||||
|
Bivalvia
- Arcida
- Arcidae
|
||||||||||
|
Dallarca idonea
(Conrad 1832)
|
||||||||||
|
Bivalvia
- Pectinida
- Pectinidae
|
||||||||||
|
Chesapecten covepointensis
Ward 1992
|
||||||||||
|
Bivalvia
- Hiatellida
- Hiatellidae
|
||||||||||
|
Panopea goldfussii
Wagner 1839
|
||||||||||
|
Bivalvia
- Cardiida
- Cardiidae
|
||||||||||
|
Chesacardium laqueatum
(Conrad 1830)
|
||||||||||
| Subspecies: C. laqueatum eschelmani | ||||||||||
|
Bivalvia
- Cardiida
- Veneridae
|
||||||||||
|
Mercenaria cuneata
Conrad 1869
|
||||||||||
|
Dosinia acetabulum
(Conrad 1832)
|
||||||||||
| Subspecies: D. acetabulum throi | ||||||||||
|
Clementia inoceriformis
(Wagner 1839)
|
||||||||||
| recombined as Clementia (Clementia) inoceriformis | ||||||||||
|
Bivalvia
- Cardiida
- Mactridae
|
||||||||||
|
Mactrodesma subponderosa
(d'Orbigny 1852)
|
||||||||||
|
Bivalvia
- Lucinida
- Lucinidae
|
||||||||||
|
Lucinoma contracta
(Say 1824)
|
||||||||||
|
Stewartia anodonta
(Say 1824)
|
||||||||||
|
Bivalvia
- Carditida
- Crassatellidae
|
||||||||||
|
Marvacrassatella sp.
Ward and Blackwelder 1987
|
||||||||||
|
Elphidiidae
|
||||||||||
|
Elphidium latispatium
Poag 1966
|
Gibson 1983 | |||||||||
| subspecies pontium | ||||||||||
|
Tubothalamea
- Miliolida
- Hauerinidae
|
||||||||||
|
Massilina marylandica
|
Gibson 1983 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Maryland | County: | St Marys |
| Coordinates: | 38.3° North, 76.4° West (view map) | ||||
| Paleocoordinates: | 38.4° North, 74.6° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 6 | ||
| Key time interval: | Late/Upper Miocene | ||
| Age range of interval: | 11.63000 - 5.33300 m.y. ago |
Stratigraphy
| Formation: | St Marys | Member: | Little Cove Point | ||
| Local section: | Langleys Bluff | ||||
| Regional section: | St Marys River | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Unit A in Ward 1992 (Fig. 26), ~0.5 m of sand. Collection from Little Cove Point of St Marys Fm, at the base of the section, and underlies unit B of the Little Cove Point Mbr, St Marys Fm. | |||||
Lithology and environment
| Primary lithology: | fine,shelly/skeletal,gray,green unlithified silty sandstone |
| Includes fossils? | Y |
| Lithology description: Sand, silty, fine, olive-gray; excellantly preserved mollusks common. | |
| Environment: | coastal indet. |
| Glacial or sequence phase: | transgressive |
| Geology comments: Accumulated during a transgression. From open shelf marine conditions. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | excellent |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USNM |
| Collection method comments: Most material appears to be reposited in USNM and USGS collections | |
| Taxonomic list comments:Probably not exhaustive, but a summary of the common and abundant forms from unit. Modern nomenclature utilized with species level assignments. | |
Metadata
| Database number: | 59305 | ||
| Authorizer: | A. Hendy, M. Uhen | Enterer: | A. Hendy, M. Uhen |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-03-25 15:42:06 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2006-03-25 15:42:06 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 16985. | L. W. Ward. 1992. Molluscan biostratigraphy of the Miocene Middle Atlantic Coastal Plain of North America. Virginia Museum of Natural History 2 [A. Miller/A. Hendy] |
Secondary references:
| 17886 | T. G. Gibson. 1983. Key foraminifera from upper Oligocene to lower Pleistocene strata of the central Atlantic coastal plain. Smithsonian Contributions to Paleobiology 53:355-453 [M. Uhen/M. Uhen] |