Fifty-three basins with area less than 9.40 km² were mapped from 1:25,000-scale aerial photographs to provide data on basin morphometry. A significantly larger number of first-order streams exist than are expected according ...

The Triassic Dockum Group is a complex assemblage of lacustrine, deltaic, and fluvial facies. Excellent exposures of these rocks were studied in and around Palo Duro State Park where the Prairie Dog Town Fork of the Red ...

Silicified evaporite nodules from the Mississippian rocks of south-central Kentucky and adjoining Tennessee typify in many respects silicified evaporite nodules which have been reported in rocks of widely differing ages ...

Fault scarps cutting alluvial deposits define the present-day eastern boundary of Basin and Range faulting in Trans-Pecos Texas. These faults are found in the Salt Basin graben north of Van Horn, Texas, and its southerly ...

The Chisos Mountains in the central part of Big Bend National Park are a deeply-eroded volcanic-intrusive complex of Oligocene age. Intrusive and extrusive units of the complex are subalkaline to midly peralkaline, and ...

The Lower Arroyo Penasco, which is probably of Mississippian age, is a relatively thin elastic unit composed of medium-and coarse-grained sand and gravel. It rests on a topographically irregular Precambrian crystalline ...