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Floyd Gray

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Articles by Floyd Gray

Preliminary geologic map of the Greater Antilles and the Virgin Islands

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By Frederic Wilson, Greta J. Orris, Floyd Gray
| usgs.gov
Links Document: Pamphlet (862 KB pdf) Sheets: Sheet 1 (3.3 MB pdf) Sheet 2 (4.6 MB pdf) Tables: Table 2 (684 KB pdf) Table 2 (80 KB xlsx) Spatial Data: OFR 2019-1036 spatial data (196.5 MB zip) Open Access Version: Publisher Index Page Download citation as: RIS | Dublin Core Introduction First posted January 13, 2020 This geologic map of the Greater Antilles and the Virgin Islands is a compilation of information from the literature, integrated to provide a seamless geologic map of the region.
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Hydrogeologic investigations of the Miocene Nogales Formation in the Nogales Area, Upper Santa Cruz Basin, Arizona

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By William Page, Floyd Gray, Mark W. Bultman, Christopher M. Menges
| usgs.gov
Hydrogeologic investigations were conducted to evaluate the groundwater resource potential for the Miocene Nogales Formation in the Nogales area, southern Arizona. Results indicate that parts of the formation may provide new, deeper sources of groundwater for the area.
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Geologic Map of the Rio Rico and Nogales 7.5’ Quadrangles, Santa Cruz County, Arizona

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By William Page, Christopher M. Menges, Floyd Gray, Margaret E. Berry, Mark W. Bultman, Michael A. Cosca, D. Paco VanSistine
| usgs.gov
The Rio Rico and Nogales (Arizona) 1:24,000-scale quadrangles are located in the Basin and Range Province of southern Arizona, and the southern edge of the map is the international border with Sonora, Mexico. The major urban area is Nogales, a bi-national city known as “the gateway to Mexico.”  Rocks exposed in the map area range in age from Jurassic through Quaternary.
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