Little Valley Limestone (overview) (Carboniferous of the United States)

Where: Washington County, Virginia (36.8° N, 82.3° W: paleocoordinates 19.9° S, 30.6° W)

• coordinate stated in text

• local area-level geographic resolution

When: Little Valley Formation, Meramecian (345.0 - 336.0 Ma)

• On Geolex page, Little Valley was assigned as member of the Greenbrier Fm. by Nolde, 1994, and listed as Meramecian age. The Greenbrier is assigned to the Meramecian - Chesterian age, thus I decided that the Little Valley is probably Late Meramec (= Holkerian - Asbian).

• formation-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, ooidal, argillaceous, sandy, cherty/siliceous limestone and shale

• includes mainly argillaceous limestone with some shale and minor sandstone. limestone is gray, argillaceous, medium to thick bedded, cherty. some oolitic limestone present at base. cherty limestone contains bedded rows of gray, irregular, chert nodules. the shale is dark gray-black-brown, mostly fissile and fossiliferous. principally confined to 2 units in upper third of formation. 1-3 beds of light grayish brown med-bedded fine grained calcareous sandstone.

Primary reference: C. S. Bartlett, Jr. and H. W. Webb. 1971. Geology of the Bristol and Wallace quadrangles, Virginia. Virginia Division of Mineral Resources Report of Investigations 25:1-93 [J. Alroy/M. Sommers/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 6999: authorized by John Alroy, entered by Mike Sommers on 20.04.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

 Podocopida - Quasillitidae
 Hyolithida - Hyolithidae
Hyolithes sp. d'Eichwald 1840
 Productida - Productidae
 Athyridida - Athyrididae
 Terebratulida - Cranaenidae
 Spiriferinida - Punctospiriferidae
 Spiriferinida - Syringothyrididae
 Spiriferida - Spiriferidae
 Rhynchonellida - Tetracameridae
 Lingulida - Disciniidae
Orbiculoidea sp. d'Orbigny 1847
 Pectinida - Aviculopectinidae
Aviculopecten sp. M'Coy 1851 scallop
 Ostreida - Posidoniidae
Posidonia becheri Bronn 1828 oyster
 Ostreida - Pterineidae
Caneyella sp. Girty 1910 oyster
 Cardiidia - Sanguinolitidae
Wilkingia sp. Wilson 1959 clam
 Cardiidia - Grammysiidae
Grammysia sp. de Verneuil 1847 clam
 Modiomorphida - Modiomorphidae
Megambonia sp. Hall 1859 clam
 Pholadomyida - Edmondiidae
Edmondia sp. de Koninck 1841 clam
Allorisma sp. King 1844 clam
 Protobranchia -
? Nuculites sp. Conrad 1841 clam
 Protobranchia - Nuculanidae
Phestia sp. Chernyshev 1951 pointed nut clam
Nuculana sp. Link 1807 pointed nut clam
 Prosobranchia - Meekospiridae
Meekospira sp. Ulrich and Scofield 1897 snail
Cephalopoda indet. Cuvier 1797
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
 Fenestrata -
 Trepostomida - Stenoporidae
 Cystoporida - Cystodictyonidae
 Cystoporida - Hexagonellidae
 Rhabdomesida - Rhomboporidae
Crinoidea indet. Miller 1821 Sea lily
crinoid columnals
 Auloporida - Syringoporidae
Syringopora virginica tabulate coral
 Stauriida - Hapsiphyllidae
Neozaphrentis sp. Grove 1935 horn coral
Zaphrentites sp. Hudson 1941 horn coral