Where: Coconino County, Arizona (35.7° N, 111.5° W: paleocoordinates 9.6° N, 36.2° W)

• coordinate estimated from map

• local area-level geographic resolution

When: "Alpha" Member (Kaibab Formation), Roadian (272.5 - 268.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; limestone

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical,

Primary reference: H. Chronic. 1952. Molluscan fauna from the Permian Kaibab Formation, Walnut Canyon, Arizona. Geological Society America Bulletin 63(2):95-166 [D. Bottjer/M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40001: authorized by David Bottjer, entered by Matthew Clapham on 13.06.2004