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Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

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At least 127 records · Page 7Linked to original sources
USGS1990

Ground-water resources of the upper White River basin in Arkansas

The upper White River basin in Arkansas lies almost entirely within the Ozark Plateaus physiographic province, which consists of deeply dissected plateaus underlain by limestone, shale, and dolomite. Significant water-yielding units within the upper White River basin include the Eminence and Potosi Dolomites, the Roubidou Formation, the Gasconade Dolomite and the Van Buren Formation, outcrops of undifferentiated Paleozoic rocks, the Nacatoch Sand, and quaternary deposits. Water in the Quaternary deposits is the most heavily used, but areally, other units are significant sources of groundwater for domestic and rural use. The quality of groundwater withdrawn from the various units generally is suitable for most uses, although groundwater in the study area is typically very hard. Iron concentrations commonly exceed allowable limits. Yields from the different water-yielding units are highly variable. The Eminence and Potosi Dolomites are known to yield as much as 230 gal/min. Nearer the surface, the Gunter Sandstone Member of the Van Buren Formation yields as much as 500 gal/min. Above the Gunter Sandstone, the Roubidoux Formation yields as much as 450 gal/min to wells. In contrast to the high yields from these deeper units , the outcrops of Paleozoic rocks commonly yield less than 10 gal/min. The Quaternary deposits yield as much as 2,500 gal/min of very hard water. Elevated nitrate concentrations that exceed U.S. Environmental Protection Agency primary drinking-water standards occur in Marion County. In addition, saline water is present in the Quaternary deposits near Bald Knob and Cord, Arkansas. (USGS)

Open-File Report↗
USGS2003

Database and Map of Quaternary Faults and Folds in Peru and its Offshore Region

This publication consists of a main map of Quaternary faults and fiolds of Peru, a table of Quaternary fault data, a region inset map showing relative plate motion, and a second inset map of an enlarged area of interest in southern Peru. These maps and data compilation show evidence for activity of Quaternary faults and folds in Peru and its offshore regions of the Pacific Ocean. The maps show the locations, ages, and activity rates of major earthquake-related features such as faults and fault-related folds. These data are accompanied by text databases that describe these features and document current information on their activity in the Quaternary.

Open-File Report↗
USGS1953

Geology and coal deposits of Jarvis Creek coalfield, Alaska

The Jarvis Creek coal field lies on the north side of the Alaska Range between latitudes 63 ° 35' and 63 ° 45 N., and longitudes 145 ° 40' and 145 ° 50 W. It is 2 to 6 miles east of the Richardson Highway. The coal field is about 16 square miles in area, the major part of which is a rolling plateau that slopes gently northward and is bounded on the east, south and west, by bluffs facing Jarvis Creek, Ruby Creek and Delta River. The oldest rock is pre-Cambrian Birch Creek schist, which is largely quartz-sericite schist with many quartz veins, and is locally intruded by rhyolite dikes. it is overlain by the Tertiary coal-bearing formation. Quaternary deposits include gravel, till, solifluction debris, and wind-borne deposits.

Alaska↗