Perry site 6, beds 18+19 (Permian of the United States)

Where: Noble County, Oklahoma (36.3° N, 97.4° W: paleocoordinates 3.6° N, 26.2° W)

• coordinate estimated from map

When: Wellington Formation (Sumner Group), Leonard (290.1 - 268.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; red sandstone and lenticular, silty, sandy shale

• "These [...] beds [...] appear to have originated in a lake, very near to shore."
• "[...] red sandstone, bed 19 of the section. [...] small lenses that lie just under the red sandstone, in bed 18 of the section. These lenses [...] run from two to five feet in diameter, and are roughly ovoid in shape. The rock is a heterogeneous mixture of sandy shale, shale, sandstone, and masses of mud which are rich in organic remains. [...] The bed below the sandstone, of which these lenses make up the topmost part, is predominantly a dark, red to brown, sandy shale. In its upper part it also carries some lenses of very fine, chocolate colored sandy shale, with very fine sand and some mica."

Size class: macrofossils

Collected by E. C. Olson

Primary reference: E. C. Olson. 1970. New and little known genera and species of vertebrates from the Lower Permian of Oklahoma. Fieldiana: Geology 18(3):359-434 [J. Mueller/J. Dummasch/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 84941: authorized by Johannes Mueller, entered by Torsten Liebrecht on 18.11.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Tooth plates, listed as Sphaerolepis arcata in Olson (1967), are a common associate of Platysomus and occur rather widely in both beds 18 and 19. It seems quite possible that these actually represent tooth plates of Platysomus."

•Besides the taxa listed, "indeterminate remains of a small amphibian" are present.

 Conchostraca -
Estheria sp. Ruppell 1837 clam shrimp
 Xenacanthiformes - Xenacanthidae
Xenacanthus sp. Beyrich 1848 elasmobranch
 Ctenacanthiformes - Ctenacanthidae
"Ctenacanthus" sp. Agassiz 1837 elasmobranch
 Palaeonisciformes - Platysomidae
Platysomus cf. palmaris Cope 1891
"partial fish,, scales"
 Dipnoi - Gnathorhizidae
Gnathorhiza serrata Cope 1883 lungfish
"tooth plate"
 Temnospondyli - Trimerorhachidae
Trimerorhachis cf. insignis Cope 1878 tetrapod
"fragments of skull, jaws, limbs and teeth"
 Araeosceloidea -
Dictybolos tener Olson 1970 diapsid
FMNH UR 1042-1173
 Synapsida - Ophiacodontidae
Ophiacodon sp. Marsh 1878 ophiacodont
"small part of jaw, teeth"
 Synapsida - Sphenacodontidae
Dimetrodon sp. Cope 1878 synapsid