Geology topics
M.J. Malcolm
Publications and source records attributed to M.J. Malcolm.
Analytical results and sample locality map of rock samples from the Park Range Wilderness Study Area, Nye County, Nevada
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Analytical results and sample locality map for heavy-mineral-concentrate and stream-sediment samples from the Desatoya Mountains Wilderness Study Area, Churchill and Lander counties, Nevada
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Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Rough Hills Wilderness Study Area, Elko County, Nevada (NV-010-151)
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Analytical results and sample locality map of heavy-mineral-concentrate and rock samples from the Little Humboldt River Wilderness Study Area (NV-010-132), Elko County, Nevada
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Analytical results and sample locality map of heavy-mineral-concentrate and rock samples from the Owens Peak Wilderness Study Area (CA-010- 026), Kern and Tulare counties, California
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Analytical results and sample locality map for stream-sediment, nonmagnetic heavy-mineral concentrate, and rock samples from the Blue Eagle Wilderness Study Area (NV-060-158/199), Nye County, Nevada
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Analytical results and sample locality map of heavy-mineral- concentrate and rock samples from the Kingston Range Wilderness Study Area (CDCA-222), San Bernardino County, California
During 1984, 60 stream sites were sampled for the presence of Giardia sp. cysts. The sampling sites ranged in elevation from 6 ,000 to 12,000 feet, and were distributed over a distance of more than 200 miles, from the Lake Tahoe basin in the north to Mt. Whitney in the south. Cysts of Giardia were detected in 27 of 78 samples. The number of cysts detected ranged from 1 to 41. Of the 27 samples positive for Giardia, only 1 cyst was detected in each of 10 samples, 2 cysts were detected in each of 8 samples, 3 cysts were detected in each of 3 samples, 4 cysts were detected in each of 2 samples, and 5, 6, 14, and 41 cysts were detected in 1 sample each. (USGS)
Geochemistry of altered and mineralized rocks from the Morey and Fandango Wilderness Study Areas, northern Hot Creek Range, Nye County, Nevada
The U.S. Geological Survey and the St. Johns River Water Management District are investigating the hydrogeology of the Floridan aquifer system. An essential element of this investigation is the design and construction of a monitor well network in the lower saline water-bearing zone which occurs at about 2,000 ft below land surface. During 1985, a well near Ponte Vedra in northeast St. Johns County was completed into the lower saline water-bearing zone at a depth of 1,980 to 2,035 ft below land surface. This well and other wells drilled under this or other programs will be used to monitor water levels and water chemistry of the lower saline zone. Chloride concentrations in water above the lower saline zone ranged from 14 to 270 mg/L and specific conductance ranged from 450 to 1,440 micromhos/cm c. In the lower zone, chloride concentrations were as much as 16,210 mg/L and specific conductance as much as 46,000 micromhos per centimeter. Aquifer head and artesian flow from the well generally increased with depth. Water temperatures also increased from 23 C in the upper part of the aquifer to more than 28 C in the lower saline zone. (USGS)
Analytical results and sample locality map of heavy-mineral-concentrate and rock samples from the Castle Peaks Wilderness Study Area (CDCA- 266), San Bernardino County, California
The report presents water-quality and geohydrologic information for 106 public water-supply wells in Illinois. These wells were sampled during April to December 1984 as part of a pilot program to develop a ground-water observation network in the State. The pilot program was designed to sample single-aquifer wells from three major aquifer systems--(1) sand and gravel, both confined and unconfined; (2) Silurian dolomite; and (3) the Ironton-Galesville deep sandstone. Data are tabulated for water temperature, pH, specific conductance, oxidation-reduction potential, ammonia nitrogen, nitrate + nitrite nitrogen, phosphorus, silica, arsenic, lead, mercury, fluoride, chloride, sulfate, cyanide, phenols, selenium, residue on evaporation at 180 degrees Celsius, alkalinity, calcium, magnesium, sodium, potassium, barium, boron, beryllium, cadmium, chormium, copper, cobalt, iron, aluminum, manganese, nickel, silver, strontium, vanadium, zinc, and selected geohydrologic information.
Analytical results and sample locality maps of stream-sediment and heavy-mineral-concentrate samples from the Battle Creek (ID-16-49E), Deep Creek-Owyhee River (ID-16-49A), Juniper Creek (ID-16-52), Little Owyhee River (ID-16-48C), Owyhee River Canyon (ID-16-48B), South Fork Owyhee River (ID-16- 53), and Yatahoney Creek (ID-16-49D) Bureau of Land Management Wilderness Study Areas, Owyhee County, Idaho
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Analytical results and sample locality maps of stream-sediment and heavy-mineral-concentrate samples from the Honeycombs (OR-003-77A) and the Owyhee Canyon (OR-003-195) Bureau of Land Management Wilderness Study Areas, Malheur County, Oregon
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Geochemistry of trace elements and uranium in Devonian shales of the Appalachian Basin
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Preliminary analytical results for a new U.S. Geological Survey Devonian Ohio Shale Standard SDO-1
Using several analytical techniques, results of analysis of U. S. Geological Survey new standard SDO-1 are given for selected elements. The Devonian black shale shows an organic carbon content of approximately 10.3 percent, a sulfur content of approximately 5.6 percent, and a uranium content of approximately 56 ppm. Some elements show higher than average values for black shales: Mn, 389 ppm; Co, 57 ppm; Ni, 128 ppm; As, 104 ppm; and Hg, 0.19 ppm.