Geosciences and Environmental Change Science Center
January 20, 2017
GECSC Geologist Don Sweetkind is co-author on three related reports:
• Update of the Death Valley Regional Groundwater Flow System Numerical Model, Nevada and California (USGS Scientific Investigations Report 2016-5150)
• Hydraulic Characterization of Volcanic Rocks in Pahute Mesa Using a Consolidated Analysis of 16 Multiple-Well Aquifer Tests, Nevada National Security Site, 2009-2014 (USGS Scientific Investigations Report 2016-5151)
• Simulating regional groundwater flow in the vicinity of the Nevada National Security Site, Nye County, Nevada [PDF] (published in Waste Management 2016)
All three reports result from Don's work with hydrologists at the Nevada Water Science Center, combining geology and hydrology to simulate groundwater flow at the Nevada National Security Site (formerly Nevada Test Site). He contributed subsurface hydrogeologic framework to the analysis for each report.
January 17, 2017
Geologic map of the Fittstown 7.5' quadrangle, Pontotoc and Johnston Counties, Oklahoma
By Dave Lidke and Chuck Blome. USGS Survey Scientific Investigations Map 3371.
This 1:24,000-scale geologic map of the Fittstown quadrangle, located in northeastern part of the Arbuckle Mountains in south-central Oklahoma, includes new geologic mapping as well as compilation and revision of previous geologic maps in the area. The report also contains a pamphlet that describes the geologic setting of the mapped area, georeferenced map, and GIS files.
January 12, 2017
On the importance of stratigraphic control for vertebrate fossil sites in Channel Islands National Park, California, USA: Examples from new Mammuthus finds on San Miguel Island
By Jeff Pigati (GECSC), Dan Muhs (GECSC), and Jack McGeehin. Published in Quaternary International.
Mammoth and other quaternary vertebrate fossils are relatively common on the northern Channel Islands, but the lack of geologic context of the finds presented in the published literature has hampered the interpretation of associated 14C ages and reconstruction of past environmental conditions. Fossils (all likely mammoth) were recently uncovered at two sites on the northwest flank of San Miguel Island, and this study presents documentation of their stratigraphic context, descriptions of the host sediments in detail, and their ages. In addition, this report proposes a series of protocols for documenting and reporting geologic and stratigraphic information at fossil sites on the California Channel Islands in general, and in Channel Islands National Park in particular, so that pertinent information is collected prior to excavation of vertebrate materials, thus maximizing their scientific value.
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