Narrows 19 (DNR19) (Ordovician of the United States)

Where: Giles County, Virginia (37.4° N, 80.8° W)

• Paleocoordinates: 20.0° S, 112.3° W (Wright 2013)

• coordinate based on unpublished field data

• small collection-level geographic resolution

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

• Total unit thickness = 15.67 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, nodular, shelly/skeletal, gray packstone and shale

• Stratigraphy and geology information based on Kreisa (1980); within Kreisa's mixed carbonate-clastic platform facies
• Limestone (60%) and shale (40%); limestone is skeletal packstone (20%) and subequal parts calcarenite and calcisiltite (total 40%); medium light gray, very thin and thin bedded, plane laminated and CWRL but some calcisiltites massive, some nodular bedded

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 85708: authorized by Karen Layou, entered by Karen Layou on 13.01.2009

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite
Rhynchonellata
 Atrypida - Anazygidae
Zygospira lebanonensis
Strophomenata
 Strophomenida - Rafinesquinidae
Rafinesquina alternata
 Strophomenida - Sowerbyellidae
Sowerbyella rugosa
Stenolaemata
  -
Stenolaemata "indet. A"
Stenolaemata "indet. A" Borg 1926
small ramose bryozoans