Rocks of rhyolitic type in eastern Idaho and adjacent parts of Wyoming were observed by the Teton Division of the Hayden Surveys under Orestes St. John (Report of the geological field work of the Teton Division, U.S. Geol. and Geog. Surv. Terr., 11th Ann. Rep., pp. 498–504, 1879), who described them as trachytes. He noted their relations to different types of underlying sedimentary rocks and their tendency to conform with the preexisting topography, but considered them all as flows. ©1935. American Geophysical Union. All Rights Reserved.
Additional publication details
|Publication Subtype||Journal Article|
|Title||Welded rhyolitic tuffs in southeastern Idaho|
|Series title||Eos, Transactions, American Geophysical Union|
|Publisher||American Geophysical Union|
|Google Analytic Metrics||Metrics page|