Eggleston Formation, north of Scales (Ordovician of the United States)

Where: Tazewell County, Virginia (37.0° N, 81.0° W: paleocoordinates 30.0° S, 61.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Eggleston Formation, Trentonian (460.9 - 449.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: gray, calcareous mudstone and argillaceous limestone

• 30 to 115 feet of dark-gray calcareous mudrock, medium-gray argillaceous limestone, dark-brown siltstone, wavy bands of rusty-brown fossiliferous chert, apricot-buff metabentonite, and greenish-gray cuneiform-jointed siliceous mudrock. The cuneiform-jointed beds invariably overlie or underlie the metabentonites.

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 34339: authorized by Steven Holland, entered by Tori Hanson on 27.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Ostracoda
 Palaeocopida -
Leperditella sulcata ostracod
(Ulrich)
Eurychilina subradiata ostracod
Ulrich
 Leperditicopida - Leperditiidae
"Isochilina sp." = Leperditia (Isochilina)
"Isochilina sp." = Leperditia (Isochilina) Jones 1858 ostracod
Stenolaemata
 Cryptostomata - Ptilodictyonidae
Escharopora subrecta Ulrich 1886
(Ulrich)
 Trepostomata - Halloporidae
Hallopora multitabulata Ulrich 1886
(Ulrich)
Strophomenata
 Strophomenida - Sowerbyellidae
"Sowerbyella "sericea"" = Sowerbyella (Sowerbyella) sericea Sowerby 1839
 Strophomenida - Rafinesquinidae
Rhynchonellata
 Orthida - Dalmanellidae