BC-8 (Chickasha Formation) (Permian to of the United States)

Also known as Chickasha Tongue; Flowerpot Shale; Flowerpot Formation

Where: Blaine County, Oklahoma (36.0° N, 98.4° W: paleocoordinates 4.6° N, 26.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Chickasha Formation (El Reno Group), Roadian to Roadian (272.3 - 265.1 Ma)

• "All the deposits are in that part of the Chickasha Formation delineated by Fay (1962) as the Chickasha Tongue within the Flowerpot Formation. The tongue contains four mapped beds, numbered consecutively from 1 (lowest) to 4 (highest)." A measured section consisting of 6 beds is given for BC-8.

•Minimum age originally entered as >> Capitanian <<. These beds, however, are likely to be older (see, e.g., Reisz & Laurin, 2002, 114(9)).

• bed-level stratigraphic resolution

Environment/lithology: deltaic; red, argillaceous, conglomeratic shale and green, sandy shale

• "The vertebrate fauna in the Chickasha deposits lived on a delta marginal to the sea in which the deposits of the El Reno Group were formed...No other beds have yielded vertebrates."
• "Vertebrates have come from the [lower] red shale of bed 2, associated with small lenses of clay gall conglomerate." The Holotype of Varanodon agilis n. g., n. sp. "lay mostly in red shale, but it passed from this into a sandy, green shale in places."

Size class: macrofossils

Reposited in the FMNH, UCMP

Primary reference: E. C. Olson. 1965. New Permian vertebrates from the Chickasha Formation in Oklahoma. Circular Oklahoma Geological Survey 70:1-70 [C. Sidor/C. Sidor/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 27479: authorized by John Alroy, entered by Robin Whatley on 06.12.2002, edited by Torsten Liebrecht

Creative Commons license: CC BY (attribution)

Taxonomic list

• ?Chelonia indet.: "The shell features suggest that it was a Tertiary chelonian. The fragments were on the surface with only a slight cover, so it may be assumed that they washed down from above...preservation is not different from the Permian specimens." (Olson, 1965 p. 65).

•In the following paragraph (Olson, 1965 p. 65) it says that the "jaw and teeth are lizardlike, or rhynchocephalian." It seems that the paragraph is wrongly placed within the text and actually still belongs to the description of the indeterminate specimen (CNHM UR 1006) from locality BC-9 (coll. 27480).

Osteichthyes
 Synapsida - Varanopidae
Varanodon agilis n. gen. n. sp.
Varanodon agilis n. gen. n. sp. Olson 1965 synapsid
CNHM UR 986 (type)
Reptilia
 Eureptilia - Captorhinidae
"Rothia robusta" = Rothianiscus robusta
"Rothia robusta" = Rothianiscus robusta Olson 1965 eureptile
CNHM UR 996
 Procolophonomorpha - Nycteroleteridae
"Seymouria agilis n. sp." = Macroleter agilis
"Seymouria agilis n. sp." = Macroleter agilis Olson 1980 parareptile
UCMP 143 277 (type)