Cretaceous limestone, marl, and dolomite of Late Aptian to Middle Albian age crop out in the Wimberley area, a 5-minute by 10-minute quadrangle in central Texas situated in the dissected eastern margin of the Edwards ...

An ash-flow sheet, to which the names Mitchell Mesa Rhyolite and Brite Ignimbrite have been applied, crops out prominently in Presidio and western Brewster Counties, Texas. Because of its great areal extent it is the most ...

The El Rosario Quadrangle, situated 100 kilometers northwest of the capital, Tegucigalpa, on the Carretera del Norte, straddles the boundary between the Volcanic Ranges and Plateaus and the Central American Cordillera ...

The Dockum Group (Upper Triassic) in the Tule Canyon area is a complex assemblage of terriginous clastic rocks deposited within a broad, shallow intracratonic basin. Lakes were present in the basin through most of Dockum ...

Six fossil communities were recognized in the Del Rio Formation based on Q-mode cluster analysis of 158 samples collected from 14 Del Rio measured sections in central through north Texas. Using this method of analysis, ...

The Canyon Group (Missourian Series) is a sequence of westward-dipping, genetically related carbonate and terrigenous clastic facies that crop out in a northeast-southwest belt across North-Central Texas. The section ...

Quantitative prediction of littoral drift, the longshore transport of sediment in the surf zone of beaches is highly useful in the design of coastal engineering works such as harbor entrances, groin fields, and beach ...

Bat Cave quadrangle lies on the maturely dissected eastern margin of the Edwards Plateau. Sinkholes, caves, and other karst features are common throughout the uplands. Approximately 1,050 feet of dominantly carbonate rock ...

Surface and subsurface studies between the San Marcos-Guadalupe and Sabine Rivers indicate that terrigenous clastic sequences in the Queen City Formation accumulated as part of a high-constructive, lobate delta system. ...

The Matagalpa Formation, the oldest unit exposed (Oligocene? - Early Miocene?), consists of over 300 meters of hydrothermally altered mafic flows and some interbedded sedimentary rocks. Up to 1400 meters of siliceous ...