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A stratigraphic study of the Monterey Group in the East San Francisco Bay Region, California, indicates that a depositional basin began to subside in early to middle Miocene time. The Miocene sea transgressed from the west or southwest, and the area subsided to a possible water depth of 500 to...

During a period of 3 days, 22 audio-magnetotelluric (AMT) soundings were made in the area of the Silver Star Hot Springs, Mont. (fig. 1). These soundings were made to assess the geothermal potential along a northern trend of. hot springs from New Biltmore Hot Springs north to Broadwater Hot Springs,...

Four days were spent collecting 20 audio-magnetotelluric (AMT) soundings in the area of the Ennis Hot Springs, Mont. (fig. 1). These soundings were made to assist in a regional evaluation of the geothermal potential of the Ennis Hot Springs area.Scalar resistivities from the data log (table 1) are indicative of...

One hundred thirty seven new gravity stations at an average station density of one station per 17.5 km2 have been established in a 40 x 60 km area centered on Sabkhah Hazawza in the northwestern part of the Kingdom of Saudi Arabia. A successful tie to existing Arabian American Oil...

This report summarizes and makes available to other investigators the measured hydraulic data collected during a series of experiments designed to study the effect of patterned bed roughness on steady and unsteady open-channel flow. The patterned effect of the roughness was obtained by clear-cut mowing of designated areas of an...

A salinity reconnaissance of the south coast alluvial aquifer of Puerto Rico, including the areas of Guenica, Guayanilla-Yauco, Tallaboa, Juana Diaz, and Jobos was made during 1966-68. In this investigation seawater was detected in the Guayanilla-Yauco and Tallaboa areas.Since 1968, water level and quality-of-water data have been collected from selected...

Rainfall, stormwater discharge, and water-quality data for rainfall and runoff are summarized for a commercial area in Fort Lauderdale, Florida. Loads for 20 water-quality constituents were computed for runoff from 31 storms between May 1975 and June 1977. The basin of 20.4 acres contains a shopping center with adjacent parking,...

Groundwater in Jefferson County, Tenn., occurs in solution openings that follow bedding planes and strike joints in the dense limestone and dolomite. Recharge beginning at topographic highs in the northwest moves across strike to lows in the southeast; it is intercepted and collected by high permeability beds in the middle...

Water samples from wells in Nassau and Suffolk Counties were analyzed for chloride and nitrate. Two samples were collected at each well; one was analyzed by the U.S. Geological Survey, the other by a laboratory in the county from which the sample was taken. Results were compared statistically by paired-sample...

A two-layer digital model designed for this study indicated that sealing of the Coachella branch of the All-American Canal would cause an eventual increase in seepage from the All-American Canal of about 15,000 acre-feet annually. Sealing of both the Coachella Canal and the segment of the All-American Canal between Pilot...

Ground-water data for the Baker County-northern Malheur area, Oregon, are tabulated for the Bureau of Land Management. The data include well and spring records, a well-location map, drillers' logs of wells, observation-well hydrographs, and chemical analyses of ground-water samples. The reported yields of wells and springs in the area ranged...

This open—file report lists most papers and abstracts on the geology and mineral resources of Alaska published by the Geological Society of America from 1890 through 1978. They are listed by the quadrangles (scale 1:250,000) into which Alaska has been subdivided for topographic mapping (p. 2). Not included are papers...

A variety of mafic and ultramafic inclusions occur within the pyroclastic components of the Al Birk basalt, erupted on the southern Red Sea coastal plain of Saudi Arabia from Pleistocene time to the present. Depleted harzburgites are the only inclusions contained within the basalts that were erupted through Miocene oceanic...

This open—file report lists all papers and abstracts on the geology and mineral resources of Alaska published in the American Association of Petroleum Geologists Bulletin from 1950 through 1978. They are listed by the quadrangles (scale 1:250,000) into which Alaska has been subdivided for topographic mapping (p. 2).Reports that deal...

The Thomas Range and northern Drum Mountains have a history of volcanism, faulting, and mineralization that began about 42 m.y. ago. Volcanic activity and mineralization in the area can be divided into three stages according to the time-related occurrence of rock types, trace element associations, and chemical nature of mineralization....

The Tampa Bypass Canal is part of a flood-control project east of the city of Tampa under construction by the U.S. Army Corps of Engineers. It will divert floodwater from the Hillsborough River at points upstream from Tampa through a canal system to McKay Bay. The U.S. Geological Survey began...

A number of efficient numerical computer algorithms are incorporated into a general program called EMCUPL, which calculates the electromagnetic (EM) coupling between two straight wires on the surface of a multilayered half space. Each layer has an isotropic conductivity which may be either real or complex. A second computer program,...

Data are presented on the quantitative relations between water chemistry and phytoplankton productivity in San Francisco Bay between March 1976 and July 1977. Spatial distributions are listed for: salinity, temperature, transmission, chlorophyll-a, fluorescence, dissolved oxygen, orthophosphate, nitrate + nitrite, nitrite, ammonia, particulate organic carbon, alkalinity, pH, pCO2, suspended sediment and...

Radioactive anomalies as high as 50 times background and uranium-bearing samples were discovered in parts of the nonmarine Tertiary Kootznahoo Formation in southeast Alaska by K. A. Dickinson and John Mitchell. Samples containing as much as 1300 ± 400 ppm uranium, measured by beta eU, were found. These samples have...