Where: Texas (33.7° N, 98.8° W: paleocoordinates 0.0° N, 29.5° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Admiral Formation, Artinskian (290.1 - 279.3 Ma)
• Upper part of Admiral Formation
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified lithology not reported
Size class: microfossils
Collection methods: chemical, acetic,
Primary reference: G. D. Johnson. 1981. Hybodontoidei (Chondrichthyes) from the Wichita-Albany Group (Early Permian) of Texas. Journal of Vertebrate Paleontology 1(1):1-41 [M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 117099: authorized by Matthew Clapham, entered by Matthew Clapham on 15.09.2011
Creative Commons license: CC BY (attribution)
Taxonomic list
Chondrichthyes | |
Polyacrodus ritchiei n. sp. Johnson 1981 elasmobranch
Polyacrodus zideki Johnson 1981 elasmobranch |