Witten Limestone, Thompson Valley (calcilutyte) (Ordovician of the United States)

Where: Tazewell County, Virginia (37.0° N, 81.6° W: paleocoordinates 29.6° S, 61.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Witten Limestone Formation, Caradoc (458.4 - 449.5 Ma)

• Blackriveran

• formation-level stratigraphic resolution

Environment/lithology: gray, argillaceous limestone

• Thin-bedded taupe-gray calcilutytes, argillaceous, mud cracks are abundant, and the zone contains lenses of edgewise conglomerate produced by partial reworking of desiccated lime muds.

Size class: macrofossils

Primary reference: B. N. Cooper and C. E. Prouty. 1943. Stratigraphy of the Lower Middle Ordovician of Tazewell County, Virginia. Bulletin of the Geological Society of America 54:819-886 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 34276: authorized by Steven Holland, entered by Tori Hanson on 25.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Orthocerida - Orthoceratidae
Orthoceras multicameratum
Gastropoda
 Murchisoniina - Subulitidae
Subulites regularis
Subulites regularis Ulrich and Scofield 1897 snail
Ulrich and Scofield
 Euomphalina - Macluritidae
"Maclurites bigsbyi" = Maclurina bigsbyi
"Maclurites bigsbyi" = Maclurina bigsbyi Hall 1861 snail
(Hall)
 Euomphalina - Helicotomidae
Helicotoma cf. verticalis
Helicotoma cf. verticalis Ulrich and Scofield 1897 snail
Ulrich
Trilobita
 Phacopida - Pterygometopidae
Calyptaulax confluens, "Calliops callicephalus" = Calyptaulax callicephalus
Calyptaulax confluens trilobite
(Foerste)
"Calliops callicephalus" = Calyptaulax callicephalus Hall 1847 trilobite
(Hall)
Stromatoporoidea
 Labechiida - Lophiostromatidae
Dermatostroma sp.
Dermatostroma sp. Parks 1910 stromatoporoid sponge
Demospongiae
 Sigmatosclerophorida - Dystactospongiidae
Dystactospongia minor
Dystactospongia minor demosponge
Ulrich and Everett
Florideophyceae
  -
"Tetradium fibratum" = Prismostylus fibratum
"Tetradium fibratum" = Prismostylus fibratum Safford 1856
Tetradium
  -
Tetradium cellulosum, Tetradium ? clarki