This U.S. Geological Survey (USGS) data release provides a digital geospatial database for the geologic map of the eastern part of the Challis National Forest and vicinity, Idaho (Wilson and Skipp, 1994). Attribute tables and geospatial features (lines and polygons) conform to the Geologic Map Schema (USGS NCGMP, 2020) and represent the geologic map as published in U.S. Geological Survey (USGS) Miscellaneous Investigations Series Map I-2395 (Wilson and Skipp, 1994). The database represents the geology for the 2.7-million-acre map plate at a publication scale of 1:250,000. The map covers primarily Butte, Custer, Lemhi and Blaine Counties, but also includes minor parts of Clark County. References: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10. Wilson, A.B., and Skipp, Betty, 1994, Geologic map of the eastern part of the Challis National Forest and vicinity, Idaho: U.S. Geological Survey, Miscellaneous Investigations Series Map I-2395, scale 1:250,000, https://ngmdb.usgs.gov/Prodesc/proddesc_10267.htm.

This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here.

Maps used for field sampling were created using 2013 National Agriculture Imagery Program (NAIP) aerial imagery. Higher resolution imagery was downloaded from the Clark County GIS website for the Water Resources Education Center (Clark County 2014).

This data release is a compilation of information for hydrologic characteristics of groundwater and surface water within Clark County, South Dakota and around selected lakes (Dry Lake #1 and #2, and Antelope Lake). Information is organized into two broad categories (besides the folder for the Clark County ScienceBase landing page shapefile); reports and maps, and geographic information systems (GIS) data sources.

1:24,000 scale Geologic Map of the Nelson Quadrangle, Clark County, Nevada. Nevada Bureau of Mines Map 134. Detailed Geologic Mapping By Jame s E . Faulds, John W. Bell, and Eric L. Olson in 2002. Field work done 1999. Map includes two cross sections and 42 geologic units. The quadrangle includes part of the Highland range, Eldorado Valley, and Piute Valley. It contains excellent exposures of early to middle Miocene volcanic and sedimentary rocks, the upper part of the ~16.6 Ma Searchlight. Mining district. The Miocene section rests nonconformably on Early Proterozoic gneiss. As a result of the middle Miocene extension, Tertiary strata are moderately to steeply tilted and cut by complex arrays of normal faults. Flat-lying Quaternary alluvial-fan deposits dominate Eldorado and Piute Valleys and onlap tilted Miocene strata in the Highland Range. The GIS work was in support of the U.S. Geological Survey COGEOMAP program. Office Reviewers: Frank Hillemeyer, La Cuesta International, Inc., Kingman, AZ.; Jonathan Miller, Dept. of Geology, San Jose State University, San Jose, CA.; Alan Ramelli, NBMG; Eugene Smith, Dept. of Geoscience, UNLV. Field Reviewers: Frank Hillemeyer, La Cuesta International, Inc., Kingman, AZ.; Werner Hellmer, Dept. of Building, Clark County; Ryan Murphy, Dept. of Geological Sciences , University of Nevada; John Peck, Consulting Geologist, Las Vegas , NV.; Jonathan Price, NBMG; Alan Ramelli, NBMG. The geologic mapping was supported by the U.S. Geological Survey STATEMAP Program (Agreement No. HQ-AG-2036) and a grant from the National Science Foundation (E AR 98-96032). The 40Ar/39Ar dates were obtained through geochronology labs at the U.S. Geological Survey in Denver, for which we thank Steve Harlan, and the New Mexico Bureau of Mines, for which we thank Bill McIntosh and Matt Heizler. We greatly appreciated the hospitality of several landowners in the area, including Barney and Elaine Reagan, Gene Lambert, and John Kuyger. We also thank the Lake Mead National Recreation Area for providing housing during part of this study. Base map: U.S. Geological Survey Nelson SW 7.5' Quadrangle. To download and view this map resource, map text, and associated GIS zipped data-set, please see the links provided.