Seven maps depicting general geology, physical properties, environmental geology, soils, soil thickness, slope, and fracture intensity describe the land in the Lake Travis vicinity. The maps, descriptive text, and interpretive ...

Three principal depositional systems were defined within the Sparta Formation of Texas using surface and subsurface data: high-constructive delta system in east Texas; strandplain-barrier bar system in central Texas; and ...

Nitrate concentrations in the groundwater in southern Runnels County, Texas, ranged from less than 0.5 mg/l to 3,580 mg/l. Only ten percent of the water samples analyzed contained less than the U. S. Public Health Service ...

Sandstone units of the Upper Cretaceous San Miguel Formation in South Texas are wave-dominated deltaic sequences deposited during a major marine transgression. San Miguel sediments were deposited in the Maverick Basin ...

The San Pedro Zacapa quadrangle lies along the valley of the Río Ulúa, just southwest of Lago de Yojoa in west-central Honduras. Most of the area lies within the sierras of northern Central America; volcanic ranges and ...

Extensive diagenetic changes have occurred in deltaic sandstones of the "Gray" interval, Strawn Series (Pennsylvanian) from Taylor County, Texas. The present burial depth of the "Gray" interval is feet (1370 m.), and maximum ...

Carboniferous sedimentary rocks in eastern San Saba County and western Lampasas County are composed of an assemblage of lithosomes now assigned to the Houy, Chappel, Barnett, Marble Falls, Smithwick, and Strawn formations. ...

The Yellow Hill Quadrangle is between the Bofecillos, Davis, and Chisos volcanic centers of Trans-Pecos Texas. Tertiary volcaniclastic deposits occur only as small outliers on downthrown sides of faults. Erosion has removed ...

The Montaña de Comayagua structural belt is a zone trending N. 60° W., more than 130 kilometers long, of exposed earliest Tertiary and older rocks that were complexly deformed during the Laramide orogeny. The Honduras ...