author
Michael Casilliano
A coauthor of a classic National Park Service geology study, he helped turn Fossil Butte’s ancient lake beds and fossil record into a clear, readable story for curious visitors and science-minded readers alike.
1 Audiobook
The Geological History of Fossil Butte National Monument and Fossil Basin
by Paul O. (Paul Orman) McGrew, Michael Casilliano
About the author
Michael Casilliano is best known as the coauthor, with Paul O. McGrew, of The Geological History of Fossil Butte National Monument and Fossil Basin. The book was published as National Park Service Occasional Paper No. 3 in 1975, and the work identifies both authors with the Department of Geology at the University of Wyoming.
His published work focuses on the geology and paleontology of Fossil Butte in southwestern Wyoming, explaining the rock layers, fossil record, and environmental history of the region during the Eocene. Because reliable biographical information about him is limited in the sources available online, most of what can be confirmed publicly centers on this contribution.
That makes Casilliano an author readers often encounter through the subject rather than through a large public profile: a scientist-writer connected with a detailed, enduring guide to one of the American West’s most important fossil landscapes.