Mineral resource potential map of the Richland Creek Roadless Area, Newton and Searcy Counties, Arkansas
No abstract available.
Arkansas↗
Geology topics
Research about Arkansas
Source-linked reports with geographic coverage including Arkansas.
Identification and classification of perennial streams of Arkansas
Perennial streams are identified in a map and classified according to the relative magnitude of their 7-day, 10-year low flows. Perennial streams are identified for the entire State of Arkansas with the exception of the Mississippi Alluvial Plain. Also presented are the 7-day, 10-year low flow values at continuous-record and low-flow partial-record stations statewide. Perennial streams are defined in this report as having 7-day, 10-year low flows greater than zero. The perennial stream drainage was delineated using data from continuous-record and low-flow partial-record stations, and reconnaissance-site observations. The reconnaissance was conducted during the unusually dry summer of 1980. In analysis, the State was divided into hydrologic regions; they were used in conjunction with index stations to establish the recurrence intervals of flow observed, during the reconnaissance. When necessary, relations were developed by region to adjust observed flow to 10-year recurrence interval flows. (USGS)
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Stratigraphic framework and distribution of lignite in the Claiborne Group, Calhoun County, Arkansas
No abstract available.
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Water-resources investigations of the U.S. Geological Survey in Arkansas, fiscal year 1981
During fiscal year 1981 there were 20 water-resources investigations in progress by the Arkansas District of the U. S. Geological Survey 's Water Resources Division. Investigations that mainly involved data collection included surface-water gaging, water-level measuring, water-quality sampling, sediment sampling, and water-use inventorying. Interpretive studies included three that were principally of ground-water resources, four that were of surface-water flow charateristics, four that were of surface-water quality characteristics, and three that were interdisciplinary.
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Water-quality reconnaissance of Harding Creek, Lawrence County, Arkansas
A study of Harding Creek conducted between April and October 1980 to assess the water quality of the creek indicates no serious water-quality problems. Eight water samples were collected during periods of low to moderate streamflow (less than 19 cubic feet per second). The water was hard to very hard (100 to 220 milligrams per liter as calcium carbonate) and dissolved-solids concentrations ranged from 112 to 244 milligrams per liter. Suspended-sediment concentrations were low (generally less than 5 milligrams per liter). Total phosphorus concentrations did not exceed 50 micrograms per liter, and total nitrogen concentrations were less than 1.9 milligrams per liter. Concentrations of most metals were less than 5 micrograms per liter, the exceptions being iron (110 to 210 micrograms per liter), manganese (20 to 80 micrograms per liter), and zinc (0 to 30 micrograms per liter). Fecal-coliform bacteria were present in some samples in large enough numbers (as many as 710 colonies per 100 milliliters) to indicate that the U.S. Environmental Protection Agency criterion and Arkansas water-quality standards may be exceeded at times.
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Ground-water levels in Arkansas, spring 1981
This report contains records of water-level measurements from wells in Arkansas that comprise the statewide observation-well network maintained by the U.S. Geological Survey, in cooperation with the Arkansas Geological Commission. The observation-well network is designed to provide data for evaluation of the regional trend of water-level changes in each of the principal water-bearing formations (aquifers) that are tapped by wells in the State.
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Water-quality reconnaissance of Patton Lake, Jefferson County, Arkansas
Results of a study (summer of 1980) of pesticides, nutrients, and other water-quality characteristics of the water and bottom material of Patton Lake indicate that the lake is nutrient enriched and that several pesticides are present in the bottom material. The high pH (9.0 to 9.3) and large dissolved-oxygen concentrations (8.7 to 10.8 milligrams per liter) on August 29 indicate significant primary production. Organic-nitrogen concentrations ranged from 1.1 to 3.0 milligrams per liter (as nitrogen). Ammonia-nitrogen concentrations ranged from 0.03 to 0.05 milligram per liter (as nitrogen). Orthophosphate concentrations ranged from 0.01 to 0.14 milligram per liter (as phosphorus). Total phosphorus ranged from 0.01 to 0.20 milligram per liter. In bottom-material samples, concentrations of organic-plus-ammonia nitrogen ranged from 5,400 to 10,000 milligrams per kilogram; total phosphorus concentrations ranged from 830 to 1,400 milligrams per kilogram; and inorganic-plus-organic carbon concentrations ranged from 70 to 106 grams per kilogram. Concentrations of DDT in bottom material did not exceed 43 micrograms per kilogram. Concentrations of DDD and of DDE exceeded 150 micrograms per kilogram in most bottom-material samples. Aldrin, chlordane, dieldrin, endrin, heptachlor, and lindane also were detected in bottom material. Toxaphene, a principal contaminant present in fish from the lake, was not detected in any bottom-material samples.
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Mineral resources of the Dry Creek Wilderness study area, Logan, Yell, and Scott Counties, Arkansas
No abstract available.
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Water resources data for Arkansas, water year 1979
Water resources data for the 1979 water year for Arkansas consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels of wells. This report contains discharge records for 66 gaging stations; stage and contents for four lakes and reservoirs; water quality for 151 gaging stations, 51 partial-record stations, seven lakes, and five wells; and water levels for 83 observation wells. Also included are data for 125 crest-stage partial-record stations. Additional water data were collected at various sites, not part of the systematic-data collection program, and are published as miscellaneous measurements. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Arkansas.
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Seismicity map of the State of Arkansas
The earthquake data shown on this map and listed in table 1 are a list of earthquakes that were originally used in preparing the Seismic Risk Studies in the United States in the United States (Algermissen, 1969) which have been recompiled and updated through 1977. These data have been reexamined which resulted in some revisions of epicenters and intensities as well as assignment of intensities to earthquakes that previously had none assigned. Intensity values were updated from new and additional data sources that were not available at the time of original compilation. Some epicenters were relocated on the basis of new information. The data shown in table 1 are estimates of the most accurate epicenter, magnitude, and intensity of each earthquake, on the basis of historical and current information. Some of the aftershocks from large earthquakes are listed but are incomplete in many instances, especially for ones that occurred before seismic instruments were in universal usage.
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Water-quality investigation of the Caney Creek watershed, northeast Arkansas
The results of a 1-year study, in 1977-78, of surface-water quality in the Caney Creek watershed are presented to document conditions before implementation of Soil Conservation Service programs. Analyses of samples collected at two sites shows that water in Caney Creek and Caney Creek Ditch is of good quality with no serious water-quality problems.
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Water-quality investigation of the Flat Bayou watershed, Jefferson County, Arkansas
The results of a 1-year study, in 1977-78, of surface-water quality in the Flat Bayou watershed, Jefferson County, Ark. are presented to document conditions before implementation of Soil Conservation Service programs. Analysis of samples collected at two sites showed that oxygen depletion, as low as 32 percent of saturation at times, and high concentrations of pesticides on the streambed were the most serious water-quality problems in the watershed. The pesticides aldrin, DDD, DDE, DDT, dieldrin, endrin, heptachlor epoxide, lindane, and toxaphene were found in samples of the bottom material. One sample of bottom material contained an unusually high toxaphene concentration of 160 micrograms per kilogram.
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