Geosciences and Environmental Change Science Center
March 30, 2015
Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado
By V.J.S. Grauch, Gary Skipp (GECSC), Jonathan Thomas, Joshua Davis, and Mary Ellen Benson. USGS Data Series 918.
Well BP-3-USGS, drilled in 2009 but now plugged and abandoned, was sited to test hypotheses developed from geophysical studies and to answer questions about the history and evolution of Pliocene and Pleistocene Lake Alamosa. This report presents lithologic descriptions from the well samples and core, along with a compilation and basic data processing of the geophysical logs. It provides a basis from which future studies can answer questions regarding geologic history and climate change, groundwater hydrology, and geophysical interpretation in the San Luis Valley.
March 26, 2015
Field-Based Description of Rhyolite Lava Flows of the Calico Hills Formation, Nevada National Security Site, Nevada
By Don Sweetkind (GECSC) and Shiera Bova. USGS Scientific Investigations Report 2015-5022.
This report, produced in cooperation with the U.S. Department of Energy, describes the lithologic variability of the Calico Hills Formation based on geologic mapping of surface outcrops near the Calico Hills and Yucca Mountain in the western part of the Nevada National Security Site in southern Nevada. Map data and outcrop descriptions are used to develop information on the individual rhyolite lava flows within the Calico Hills Formation, including their lateral extent and continuity, thickness, and field-based criteria useful in stratigraphic correlation. Geologic mapping and outcrop description of the lava-bearing Calico Hills Formation are intended to provide a useful surface analog to similar rocks buried beneath Pahute Mesa in the northwestern part of the Nevada National Security Site. The geologic mapping results may be useful in developing, or at least corroborating, conceptual models of Calico Hills Formation lithofacies variations at Pahute Mesa.
March 24, 2015
Land-cover change in the Gulf Coastal Plains and Ozarks Landscape Conservation Cooperative, 1973 to 2000
By Mark Drummond, Mike Stier, and Alisa Coffin. USGS Open-File Report 2015-1018.
This report summarizes baseline land-cover change information from between 1973 and 2000 for the Gulf Coastal Plains and Ozarks Landscape Conservation Cooperative (LCC). Using sample data from the USGS Land Cover Trends dataset, the study developed estimates of change for 10 land-cover classes in the LCC, with results showing that an estimated 17.7 percent of the LCC land cover had a change during the 27-year period. The report also highlights causes and challenges of land-cover change.
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