"From 40 to 55 million years ago" . . "Geological Survey (U.S.)," . . "Geology Wyoming." . . "Geology, Stratigraphic Eocene." . . . . . . . . . "Contributions to stratigraphy"@en . . . . . . . . "Wapiti formation and Trout Peak Trachyandesite, northwestern Wyoming"@en . "Wapiti formation and Trout Peak Trachyandesite, northwestern Wyoming" . . "\"Description of two new formations in the Absaroka Mountains, Wyoming.\""@en . . . . . . . "Eocene Geologic Epoch." . . "Geology." . . . . "Geology, Stratigraphic." . . "Wyoming." . .