Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 9967
Ground-water discharge from the Edwards and associated limestones, 1955-62, San Antonio area, Texas
No abstract available.
Authors
Sergio Garza
Polyethylene as a source of artifacts in the paper chromatography of chlorinated hydrocarbon insecticides
The introduction of artifacts from vessels, materials, and chemicals is a serious problem in the study of pesticide residues. It is therefore of interest to record findings that polyethylene wash bottles contain substances soluble in organic solvents and reactive with the silver nitrate chromogenic spray commonly employed in the paper chromatographic analysis of chlorinated organic insecticides.
Authors
C.C. Van Valin, B.J. Kallman, J.J O'Donnell
A plane-type soil sampler
While studying the effects of pesticides on fish and their environment for the Bureau of Sport Fisheries and Wildlife, I have developed a soil sampler that will collect a thin uniform layer of sediment from pond and stream bottoms. As it is becoming increasingly important to analyze the residual deposits of pesticides in this shallow layer of soil in aquatic environments, it seems useful to descri
Authors
Paul J. Frey
Persistence of DDT and its metabolites in a farm pond
A farm pond near Morrison, Colorado, was treated with 0.02 p.p.m. of DDT in June 1961. The persistence and distribution of the insecticide in materials sampled from the aquatic environment were studied until November 1962. Detectable amounts of DDT were not found in the water after 3 weeks. Residues in the mud had declined within 8 weeks after the treatment to levels not significantly higher than
Authors
W.R. Bridges, B.J. Kallman, A.K. Andrews
Diffusion of herbicides through plastic film
Plastic film have been used by fishery workers as barriers to subdivide experimental ponds in order to assess the value of some chemical treatment, and as test vessels to contain dilute solutions or suspensions of toxic chemicals in experiments conducted to establish tolerance levels of these chemicals for fish.
Authors
W.R. Bridges, Herman O. Sanders
Geology and ground-water resources of Winkler County, Texas
Winkler County, in west Texas, is adjacent to the southeast corner of New Mexico. Most of the county lies in the Pecos Valley; the remainder, in the northeastern part of the county, is part of the Llano Estacado, or the High Plains. Its principal industries are those related to the production and refining of oil, but ranching also is an important occupation. The county has an arid to semiarid clim
Authors
Sergio Garza, John B. Wesselman
Geology and ground-water resources of Hays County, Texas
The Edwards limestone of Early Cretaceous age is the chief aquifer for San Marcos Springs and about 160 other springs and wells in Hays County, along the Balcones fault zone in South-central Texas.
Hays County is underlain by a basement of Paleozoic rocks; and in the southeastern part of the county the Hosston and Sligo formations of Early Cretaceous age, correlative with the Coahuila series of Me
Authors
Kenneth James DeCook
Geology and ground-water resources of Hale County, Texas
Hale County, in the southern High Plains of Texas, has an area of 1,033 square miles. The land surface is one of low relief, and the regional slope is about 10 feet per mile toward the southeast. Surface runoff drains into numerous playa lakes and two intermittent streams: Running Water Draw and the Double Mountain Fork of the Brazos River.
The Ogallala formation of Tertiary age is the principal w
Authors
J.G. Cronin, Lloyd C. Wells
Geology and ground-water resources of Bartow County, Georgia
No abstract available.
Authors
M.G. Croft
Ground-water geology of Grayson County, Texas
Grayson County in north-central Texas is near the north edge of the West Gulf Coastal Plain. The county has an area of 927 square miles and had an estimated population of 79,500 in 1957. The major town is Sherman, which has an estimated population of 31,000. The northern two-thirds of the county is drained by tributaries of the Red River; the southern one-third is drained by tributaries of the Tri
Authors
E.T. Baker
Ground-water geology of Bexar County, Texas
The investigation in Bexar County was part of a comprehensive study of a large area in south-central Texas underlain by the Edwards and associated limestones (Comanche Peak and Georgetown) of Cretaceous age. The limestones form an aquifer which supplies water to the city of San Antonio, several military installations, many industrial plants, and many irrigated farms.
The geologic formations that y
Authors
Ted Arnow