P22. Lawrence quarry, Ideal Cement Company, northeast end of Arbuckle Mountain (Ordovician of the United States)

Also known as Was: Keel Formation

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)

• Mostly from the Ideal Quarry Member.

•Was Ashgill, but Keel is Hirnantian (PJW). Also was Keel Limestone.

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

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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 55460: authorized by Mark Patzkowsky, entered by Zack Krug on 26.10.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Chileata
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
Rhynchonellata
 Athyridida - Meristellidae
 Pentamerida - Virgianidae
 Rhynchonellida - Rhynchotrematidae
 Orthida - Linoporellidae
 Orthida - Dalmanellidae
 Orthida - Orthidae
 Orthida - Hesperorthidae
Dolerorthis savagei Amsden 1974