Loc. P1-A. On the Lawrence uplift, about 2 miles southeast of Lawrence Quarry (Ordovician of the United States)

Where: Pontotoc County, Oklahoma (34.4° N, 97.2° W: paleocoordinates 22.0° S, 68.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ideal Quarry Member (Keel Formation), Hirnantian (445.2 - 443.4 Ma)

Environment/lithology: sand shoal; ooidal limestone

• concentric oolites with well develped radial and concentric structures set in a matric of spar or micrite, grading in places to an organo-detrital limestone
• Brown weathering bioclastic calcarenite grading upwards into an oolitic limestone. Thin sections show' much fossil debris, mostly pelmatozoan plates, set in a matrix which is partly clear calcite, partly brownish\vnish, finely divided cHl'b:mate. Color Ull a \Yeathel'ed surface is an olive gray (5Y 6/1) mottled ,,,ith light-brown (5Y 6/4), which on a fresh surface becomes a light-brown (GYR 4/4 to 5YR 5/6). One insoluble residue, 1.3%; residue mostly a rusty brown, spongy material, possibly limonite, with some silicified fossil debris. Dolomite content 1(;'\'1', less than 1%.

Size class: macrofossils

Primary reference: T. W. Amsden. 1974. Late Ordovician and Early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri. Bulletin - Oklahoma Geological Survey 119:1-154 [J. Alroy/M. Sommers/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 151949: authorized by Pete Wagner, entered by Pete Wagner on 23.10.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Show authors, comments, and common names
Rhynchonellata
 Orthida - Hesperorthidae
Dolerorthis savagei
Dolerorthis savagei Amsden 1974
 Pentamerida - Virgianidae
Brevilamnulella thebesensis
Chileata
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
Bivalvia
 Modiomorphida - Modiomorphidae
? Modiolopsis sp.
? Modiolopsis sp. Hall 1847 clam