Witten Limestone, Thompson Valley, Cryptopgragmus beds (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, Caradocian (460.9 - 449.5 Ma)

• Blackriveran, Cryptophragmus beds

• formation-level stratigraphic resolution

Environment/lithology: coarse-grained limestone

• 10 to 25 feet thick (18 feet thick average) ribbon-bedded coarse-grained coquina limestone.

Size classes: macrofossils, microfossils

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 34281: authorized by Steven Holland, entered by Tori Hanson on 25.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Corynexochida - Illaenidae
Illaenus sp. Dalman 1827 trilobite
 Phacopida - Pterygometopidae
Calyptaulax confluens trilobite
(Foerste)
Ostracoda
 Podocopida - Bairdiidae
Krausella arcuata ostracod
Ulrich
 Palaeocopida -
Leperditella sulcata ostracod
(Ulrich)
 Leperditicopida - Leperditiidae
"Isochilina armata" = Leperditia (Isochilina)
"Isochilina armata" = Leperditia (Isochilina) ostracod
(Walcott)
Gastropoda
 Trochonematoidea - Trochonematidae
"Trochonema umbilicatum" = Trochonema umbilicata
"Trochonema umbilicatum" = Trochonema umbilicata Hall 1847 snail
(Hall)
 Euomphalina - Helicotomidae
Helicotoma cf. granosa Ulrich and Scofield 1897 snail
Ulrich
 Euomphalina - Macluritidae
"Maclurites bigsbyi" = Maclurina bigsbyi
"Maclurites bigsbyi" = Maclurina bigsbyi Hall 1861 snail
(Hall)
 Murchisoniina - Loxonematidae
Omospira cf. laticincta Ulrich and Scofield 1897 snail
Ulrich
Cephalopoda
 Orthocerida - Orthoceratidae
Stenolaemata
 Cryptostomata - Ptilodictyonidae
Escharopora sp. Hall 1847
 Cryptostomata - Rhinidictyidae
Phyllodictya frondosa Ulrich 1882
Ulrich
 Cryptostomata - Escharoporidae
Graptodictya sp. Ulrich 1882
 Trepostomata - Monticuliporidae
Orbignyella sp. Ulrich and Bassler 1904
 Cryptostomida -
Rhinidictya nicholsoni Ulrich 1882
Ulrich
Strophomenata
 Strophomenida - Sowerbyellidae
 Strophomenida - Strophomenidae
Strophomena incurvata Shephard 1838
(Shepard)
Rhynchonellata
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
(Hall)
 Orthida - Draboviidae
 Orthida - Hesperorthidae
Hesperorthis cf. tricenaria Conrad 1843
(Conrad)
 Orthida - Plectorthidae
Doleroides sp. Cooper 1930
Stromatoporoidea
 Labechiida - Aulaceratidae
Cryptophragmus antiquatus Raymond 1914
Raymond
Tetradium
  -