Geology topics
G.A. Nowlan
Publications and source records attributed to G.A. Nowlan.
Analytical results and sample locality maps for 12 water samples from springs and domestic wells near the El Dorado, Lime Canyon, and Million Hills Wilderness Study Areas, Clark County, Nevada
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Analytical results and sample locality map of stream-sediment, panned-concentrate, and rock samples from near the Baboquivari Peak Wilderness Study Area, Pima County, Arizona
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Analytical results and sample locality map for stream-sediment and heavy-mineral-concentrate samples from the Rimrock (NM-020-007), Sand Canyon (NM-020-008), Little Rimrock (NM-020-009), Pinyon (NM-020-010), and Petaca Pinta (NM-020-014) Wilderness Study Areas, Cibola County, New Mexico
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Mineral resources of the Table Top mountain Wilderness Study Area, Maricopa and Pinal counties, Arizona
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Significance of gold and silver in drainage samples from the vicinity of the Baboquivari Peak Wilderness Study Area, Pima County, Arizona
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Analytical results and sample locality map of stream-sediment and panned-concentrate samples from the Baboquivari Peak Wilderness Study Area, Pima County, Arizona
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Regional geochemical studies in parts of Maine, New Hampshire and Vermont, U.S.A.
A geochemical survey of the Sherbrooke and Lewiston 1° × 2° quadrangles was conducted from 1979 to 1982 by the U.S. Geological Survey as part of the Conterminous United States Mineral Assessment Program. The area covers about 23,000 km 2 . The region is characterized by a temperate climate, abundant rainfall, and dense forests. The topography ranges from rolling and subdued to mountainous. Bedrock is generally covered by glacial deposits, lakes, and bogs. The bedrock includes metamorphic and plutonic rocks ranging in age from Precambrian to Cretaceous. Known mineral deposits within the area include massive-sulfide deposits, Cu-Mo porphyry deposits, minor base-metal vein deposits, minor Sn-bearing vein deposits, and minor Be-bearing skarn deposits.
Analytical results and locality map for 82 well water samples from the lower Santa Cruz Basin, Pinal County, Arizona
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