Richard A. Young

Earle E. Spamer

This collection of papers on the geology of the Grand Canyon and the Colorado River is an outgrowth of informal conversations among Colorado Plateau geologists over a period of several years.

Origin and Evolution : Proceedings of a Symposium Held at Grand Canyon National Park in June, 2000

Colorado River

Surviving component of the Wilhelm Bock collection of fossils (invertebrates, vertebrates, and plants) held at the Academy of Natural Sciences of Philadelphia

Academy of Natural Sciences of Philadelphia

Edward Daeschler

L. Gay Vostreys-Shapiro

Taxonomic, Systematic, and Historical Perspectives

A Study of Fossil Vertebrate Types in the Academy of Natural Sciences of Philadelphia

Earle E. Spamer

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