Maps

No abstract available.

This report is a result of recent studies of the Cenozoic stratigraphy and structure of the San Joaquin Valley that were directed at Cenozoic depositional and tectonic history. Most previous work on the Cenozoic has focused on the Quaternary surficial deposits and on the outcrops of older rocks at the margins of the valley, although ground-water resource studies of the upper Cenozoic deposits have

The U.S. Geological Survey and the U.S. Bureau of Mines conducted field studies from 1979 through 1983 to assess the mineral resource potential of the Vasquez Peak Wilderness Study Area (acreage: 16,000), the Williams Fork Roadless Area (acreage: 74,820), and the St. Louis Peak Roadless Area (acreage: 12,800).  Included were geological, geochemical, and geophysical studies by the U.S. Geological S

This map shows thermal-alteration indices (TAI's), based on colors of pollen grains, of 115 outcrop and 20 conventional core samples from Mesozoic and lower Tertiary rocks in the southern Coast and western Transverse Ranges, Southwestern California. The TAI's have been calibrated against previously determined vitrinite reflectance values from some of the same sample localities. South of the Santa

This map shows the faults and faulted rocks and deposits in the tectonically active part of the Rio Grande rift in Colorado, with particular emphasis on faults and deposits of Quaternary age. The Rio Grande rift in Colorado has been the subject of considerable recent geologic investigation. General compilations of the late Cenozoic tectonic features of the state of Colorado have been made by other

No abstract available.

This map presents data on the abundance and distribution of mercury in 3,146 rock samples from the Medford quadrangle. Most of the rock samples were collected incidental to geologic, geochemical, and mineral resources studies in the period from 1974 to 1980, but about 6 percent date from earlier investigations (Wells, 1940; 1956; Wells and others 1949). 

The U.S. Geological Survey and the U.S Bureau of Mines conducted field studies from 1979 through 1982 to assess the mineral resource potential of the Williams Fork and St. Louis Peak Roadless Areas and the Vasquez Peak Wilderness Study Area.  Included were geological, geochemical, and geophysical studies by the U.S. Geological Survey and investigation of known prospects and mines by the U.S. Burea

The purpose of this map is to provide a geochemical framework for the mineral resource assessment of the Domeland Wilderness and contiguous roadless areas. The map shows the distribution of anomalous elements in spring and surface waters. 

The purpose of this map is to provide a geochemical framework for the mineral resource assessment of the Domeland Wilderness and contiguous roadless areas. The map shows the distribution of anomalous elements in the magnetic fraction of heavy-mineral concentrates derived from stream sediments. 

The purpose of this map is to provide a geochemical framework for the mineral resource assessment of the Domeland Wilderness and contiguous roadless areas. The map shows the distribution of anomalous elements in the donmagnetic fraction of heavy-mineral concentrates derived from stream sediments and uranium in selected samples of minus-80-mesh (<0.180-mm) stream sediments. 

These maps are part of a folio of maps of the Richfield 1o x 2o quadrangle, Utach, prepared under the Conterminous United States Mineral Assessment Program. Other publications in this folio are listed in the selected references.  Located in west-central Utach, the Richfield quadrangle covers the eastern part of the Plioche-Marysvale ingeous and mineral belt, which extends from the vicinity of Plio