. . "Geology Powder River Basin (Wyo. and Mont.)" . . "Triassic Geologic Period." . . "Sedimentation and deposition." . . "Geological Survey (U.S.)," . . . "Depositional history of Triassic rocks in the area of the Powder River Basin, northeastern Wyoming, and southeastern Montana" . . . . . . "A multidisciplinary approach to research studies of sedimentary rocks and their constituents and the evolution of sedimentary basins, both ancient and modern." . . . "Depositional history of Triassic rocks in the area of the Powder River Basin, northeastern Wyoming and southeastern Montana" . . . . . . . . . . . . . . . . . . . . . . . . . "Depositional History of Triassic Rocks in the Area of the Powder River Basin, Northeastern Wyoming and Southeastern Montana" . . . "Depositional history of Triassic rocks in the area of the Powder River Basin, northeastern Wyoming and southeastern Montana a multidisciplinary approach to research studies of sedimentary rocks and their constituents and the evolution of sedimentary basins, both ancient and modern" . . "Sedimentation and deposition Powder River Basin (Wyo. and Mont.)" . . "United States" . . "From 190 to 230 million years ago" . . "Powder Basin." . . "Trias." . . "Geology, Stratigraphic." . . "Geology, Stratigraphic Triassic." . . "Geology." . .