Where: Northwest Frontier, Pakistan (32.2° N, 70.9° E: paleocoordinates 41.0° S, 55.2° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Chhidru Formation, Changhsingian (254.0 - 252.3 Ma)

• Bed 3 is top bed of White Sandstone Unit, the top bed of the Chhidru Formation. 8 feet thick.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; white sandstone

Size class: macrofossils

Primary reference: R. E. Grant. 1970. Brachiopods from the Permian-Triassic boundary beds and age of Chhidru Formation, West Pakistan. Stratigraphic Boundary Problems: Permian and Triassic of West Pakistan (University of Kansas Deptartment of Geology Special Pub. 4) 117-151 [D. Bottjer/M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41557: authorized by David Bottjer, entered by Matthew Clapham on 16.07.2004