Nankoweap Valley. near mouth of Grand Canyon (Cambrian of the United States)

Also known as Originally Gateway Canyon Member, Muav Fm., western Grand Canyon, AZ

Where: Arizona (36.0° N, 113.8° W: paleocoordinates 3.6° S, 95.1° W)

• coordinate based on political unit

When: lower Bolaspidella trilobite zone, Gateway Canyon Member (Muav Limestone Formation), St Davids (509.0 - 497.0 Ma)

• * "lower Bolaspidella zone or upper B-E zone"

• member-level stratigraphic resolution

Environment/lithology: offshore; limestone

• "mottled ls, offshore bank, BA3"
• Most of the Gateway Canyon member within Grand Canyon is represented by the mottled, aphanitic limestone facies, and it contains the easternmost deposits of this limestone in the Cambrian sequence.

Size class: macrofossils

Primary reference: C. E. Resser. 1945. Cambrian history of the Grand Canyon region. Part II. Cambrian fossils of the Grand Canyon. Publications of the Carnegie Institution 563:171-220 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 220: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "McKee and Resser, 1945, p.31"

•Sepkoski's Original list:

•Kootenia sp.

•Glossopleura sp.

•Clavaspidella sp.

•Anoria sp.

•? Glyphaspis sp.

•Solenopleurella sp.

•Bolaspis sp.

•Nisusia sp.

•Scenella sp.

•Hyolithes sp.

 Corynexochida - Dorypygidae
Kootenia mckeei trilobite