GIS Data
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Estimated land-surface subsidence in Harris County, Texas, 1915-17 to 2001 Estimated land-surface subsidence in Harris County, Texas, 1915-17 to 2001
Land-surface subsidence, or land subsidence, in Harris County, Texas, which encompasses much of the Houston area, has been occurring for decades. Land subsidence has increased the frequency and extent of flooding, damaged buildings and transportation infrastructure, and caused adverse environmental effects. The primary cause of land subsidence in the Houston area is withdrawal of...
Geologic map of the Fredonia 30' x 60' quadrangle, Mohave and Coconino counties, northern Arizona Geologic map of the Fredonia 30' x 60' quadrangle, Mohave and Coconino counties, northern Arizona
This geologic map is the result of a cooperative effort of the U.S. Geological Survey, the National Park Service, the U.S. Forest Service, and the Bureau of Land Management (BLM) and the Kaibab-Paiute Tribe to provide a regional geologic database for resource management officials of all government and agencies, city municipalities, private enterprises, and individuals of this part of the...
Geology of the Southern Appalachian Mountains Geology of the Southern Appalachian Mountains
The Southern Appalachian Mountains includes the Blue Ridge province and parts of four other physiographic provinces. The Blue Ridge physiographic province is a high, mountainous area bounded by several named mountain ranges (including the Unaka Mountains and the Great Smoky Mountains) to the northwest, and the Blue Ridge Mountains to the southeast. Metamorphic rocks of the mountains...
Hydrogeologic Framework of Onslow County, North Carolina, 2008 Hydrogeologic Framework of Onslow County, North Carolina, 2008
The unconsolidated sediments that underlie the Onslow County area are composed of interlayered permeable and impermeable beds, which overlie the crystalline basement rocks. The aquifers, composed mostly of sand and limestone, are separated by confining units composed mostly of clay and silt. The aquifers from top to bottom are the surficial, Castle Hayne, Beaufort, Peedee, Black Creek...
Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, May 2008 Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, May 2008
This map depicts the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for May 2008. Potentiometric contours are based on water-level measurements collected at 567 wells during the period May 6-May 27, near the end of the dry season. Some contours are inferred from previous potentiometric-surface maps with larger well...
Well Inventory and Geophysical Logging of Selected Wells in Troup County, Georgia, 2007-2008 Well Inventory and Geophysical Logging of Selected Wells in Troup County, Georgia, 2007-2008
The U.S. Geological Survey (USGS) - in cooperation with the Troup County Board of Commissioners - conducted a well inventory to provide information to help evaluate ground-water resources for Troup County, Georgia. In addition, borehole geophysical logs were collected in selected wells to provide a better understanding of the subsurface geologic and water-bearing characteristics in...