25S, Narrows, Martinsburg Fm., Giles Co., VA (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• coordinate based on unpublished field data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

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal; shelly/skeletal, gray packstone and shale

• within author's mixed clastic-carbonate facies
• limestone (50%) and shale (50%); limestone is skeletal packstone and calcisiltite and calcarenite, commonly in couplets, medium light gray, very thin and thin bedded, some laminated beds contain appreciable amounts of terrigenous silt and sand, some calcisiltites nodular bedded; shale in beds up to 1 m thick

Size class: macrofossils

Collection methods: bulk,

Primary reference: R. D. Kreisa. 1980. Virginia Polytechnic Institute and State University. 1-355 [S. Holland/K. Layou/K. Layou]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 50650: authorized by Steven Holland, entered by Karen Layou on 18.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Rhynchonellata
 Orthida - Dalmanellidae
Onniella sp.
Onniella sp. Bancroft 1928
Craniata
 Craniopsida - Craniopsidae
Craniops sp.
Craniops sp. Hall 1859
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite