Pentremites-Composita Community (II), Pitkin Limestone, Oklahoma (Carboniferous of the United States)

Where: Oklahoma (35.9° N, 95.0° W: paleocoordinates 11.7° S, 36.3° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Chesterian (339.4 - 318.1 Ma)

• The Pitkin Fm. overlies the Fayetteville Fm. This boundary is gradational and for this study was taken to be the point at which shale partings between the limestone beds were not more than several inches thick. The Pitkin limestone ranges in thickness from 0 to over 60ft. in northeastern Oklahoma. The Pitkin is absent north of Wagoner and Cherokee counties due to truncation below lower Pennsylvanian strata. In the study area, the Pitkin represents the uppermost Mississippian and is unconformably overlain by lower Pennsylvanian Morrowan Series.

Environment/lithology: shelly/skeletal packstone and grainstone

• In general, rocks dip away from the axis of the uplift which runs from Tahlequah northeast to the St. Francis Mountains. The Pitkin Limestone iss discontinuously exposed at the surface in the area due to northeast trending faulting and folding of the strata. The Pitkin Limestone thins to the north and northeast due to regional truncation during early Pennsylvanian time and tends to thicken to the south and southwest towards what was a basin at the time of depostion.
• The Pitkin limestone is dark gray, bioclastic and ooltic limestone with lesser amounts of mudstone and wackestone.

Primary reference: R. S. F. Fabian. 1987. Relation of Biofacies to Lithofacies in interpreting Depositional Environments in the Pitkin Limestone (Mississippian) in Norhteastern Oklahoma (Part I). Shale Shaker 76-95 [T. Olszewski/M. Gibson]more details

PaleoDB collection 12788: authorized by Tom Olszewski, entered by Melissa Gibson on 16.12.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Also included in the list is 0.8% pelecypods, 5.8% corals, 8.8% blastoids, 15% crinoids, 15% bryozoans
 Productida - Echinoconchidae
 Productida - Productidae
 Productida - Monticuliferidae
 Productida - Rugosochonetidae
 Athyridida - Retziidae
 Athyridida - Athyrididae
Cleiothyridina sp. Buckman 1906
Composita sp. Brown 1849
 Terebratulida - Dielasmatidae
Dielasma sp. King 1856
 Spiriferinida - Reticulariinidae
Reticulariina sp. Fredericks 1916
 Spiriferida - Spiriferidae
 Spiriferida - Elythidae
 Rhynchonellida - Stenoscismatidae
"Camarophoria sp." = Stenoscisma
"Camarophoria sp." = Stenoscisma Conrad 1839
 Spiraculata - Pentremitidae
Pentremites sp. Say 1820