Narrows 28 (DNR28) (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• coordinate based on unpublished field data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 = 22.71 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 packstone and shale

• Stratigraphy and geology information based on Kreisa (1980); within Kreisa's mixed carbonate-clastic platform facies
• Limestone (80%) and shale (20%); limestone is skeletal packstone (40%) and calcarenite (40%), commonly in couplets; thin to medium bedded, CWRL laminated and hummocky upper bedding planes common

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 85718: 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
Trilobita
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite
 Phacopida - Calymenidae
Flexicalymene sp.
Flexicalymene sp. Shirley 1936 trilobite
Gastropoda
 Murchisoniina - Lophospiridae
Loxoplocus sp.
Loxoplocus sp. Fischer 1885 snail
Strophomenata
 Strophomenida - Rafinesquinidae
Rafinesquina alternata
Rhynchonellata
 Orthida - Dalmanellidae
"Dalmanella multisecta" = Cincinnetina multisecta
"Dalmanella multisecta" = Cincinnetina multisecta James 1871
 Atrypida - Anazygidae
Zygospira lebanonensis