Porterfield Quarry, 5 miles northeast of Saltville (Ordovician of the United States)

Where: Smyth County, Virginia (36.9° N, 81.7° W: paleocoordinates 30.3° S, 66.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Hustedograptus teretiusculus graptolite zone, Arline Formation, Darriwilian (467.3 - 458.4 Ma)

• this interval falls within the lower part of the Pygodus anserinus Zone and the upper part of the Pygodus serrus Zone.

•... which occur above the Maclurites beds of the Lenoir and interfinger with black shale of the Rich Valley formation.

• formation-level stratigraphic resolution

Environment/lithology: limestone

• .. the characteristic fossils of the Arline formation occur in cobbly and shaly limestone 225 feet thick...

Size class: macrofossils

Reposited in the USNM

Primary reference: G. A. Cooper. 1956. Chazyan and related brachiopods. Smithsonian Miscellaneous Collections 127:1-1245 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 162406: authorized by Pete Wagner, entered by Pete Wagner on 24.09.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella silicica n. sp. Cooper 1956
includes Sowerbyella silicica nana Cooper
 Strophomenida - Leptellinidae
Leptellina transversa n. sp. Cooper 1956
Palaeostrophomena subtransversa n. sp. Cooper 1956
 Strophomenida - Strophomenidae
Opikina matutina n. sp. Cooper 1956
Rhynchonellata
 Orthida - Plaesiomyidae
Valcourea semicarinata n. sp. Cooper 1956