Narrows 15 (DNR15) (Ordovician of the United States)

Where: Giles County, Virginia (37.4° N, 80.8° W: paleocoordinates 29.8° S, 61.1° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Martinsburg Formation, Caradoc (458.4 - 449.5 Ma)

• Total unit thickness = 20.67 m

•

•Time interval = Trentonian-Maysvillian

•

•Stratigraphy and geology information based on Kreisa (1980)

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, shelly/skeletal, gray, silty packstone and shale

• Stratigraphy and geology information based on Kreisa (1980); within Kreisa's mixed carbonate-clastic platform facies
• Limestone (50%) and shale (50%); limestone is skeletal packstone, calcarenite and calcisiltite, commonly in couplets; medium to medium light gray, thin bedded to thin and very thin bedded toward top of unit, some laminated beds contain appreciable amounts of terrigenous silt and sand; some very thin calcisiltites nodular; shale in beds up to 1 m thick

Size class: macrofossils

Collection methods: bulk,

Primary reference: K. M. Layou. 2009. Ecological restructuring after extinction: the Late Ordovician (Mohawkian) of the eastern United States. Palaios 24:118-128 [K. Layou/K. Layou]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 85704: authorized by Karen Layou, entered by Karen Layou on 13.01.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
low-spired gastropod
Strophomenata
 Strophomenida - Rafinesquinidae
Rafinesquina alternata
Stenolaemata
  -
Stenolaemata "indet. B"
Stenolaemata "indet. B" Borg 1926
large ramose bryozoans
 Trepostomida - Monticuliporidae
Prasopora sp.
Prasopora sp. Nicholson and Etheridge 1877
Trilobita
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite