Where: Pennsylvania (39.8° N, 80.0° W: paleocoordinates 1.5° N, 12.2° W)

When: Washington Formation, Permian (298.9 - 251.9 Ma)

• placement of Pennsylvanian-Permian boundary differ. The boundary was first placed toward the base of the Monongahela Group but was moved to up near the middle of the Monongahela, and the Waynesburg Formation was placed in the Monogonghela

Environment/lithology: marine; limestone

Size class: macrofossils

Primary reference: G. D. Johnson. 1992. Chondrichthyan Biostratigraphy of the North American Permian System. Occasional Publications ESRI, New Series (8B)41-50 [M. Uhen/M. Shalap/M. Shalap]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 125957: authorized by Mark Uhen, entered by Margaret Shalap on 27.03.2012

Creative Commons license: CC BY (attribution)