Title: Geologic Map of the Leadville North 7.5' Quadrangle, Eagle and Lake Counties, Colorado By Chester A. Ruleman, Theodore R. Brandt, Marc W. Caffee, and Brent M. Goehring 2018 U.S. Geological Survey Scientific Investigations Map 3400 Data release available at https://doi.org/10.5066/F7DR2TRG ABSTRACT: The Leadville North 7.5' quadrangle lies at the northern end of the Upper Arkansas Valley, where the Continental Divide at Tennessee Pass creates a low drainage divide between the Colorado and Arkansas River watersheds. In the eastern half of the quadrangle, the Paleozoic sedimentary section dips generally 20–30 degrees east. At Tennessee Pass and Missouri Hill, the core of the Sawatch anticlinorium is mapped as displaying a tight hanging-wall syncline and foot-wall anticline within the basement-cored structure. High-angle, west-dipping, Neogene normal faults cut the eastern margin of the broad, Sawatch anticlinorium. Minor displacements along high-angle, east- and west- dipping Laramide reverse faults occurred in the core of the north- plunging anticlinorium along the western and eastern flanks of Missouri Hill. Within the western half of the quadrangle, Meso- and Paleoproterozoic metamorphic and igneous rocks are uplifted along the generally east-dipping, high-angle Sawatch fault system and are overlain by at least three generations of glacial deposits in the western part of the quadrangle. 10Be and 26Al cosmogenic nuclide ages of the youngest glacial deposits indicate a last glacial maximum age of about 21–22 kilo-annum and complete deglaciation by about 14 kilo- annum, supported by chronologic studies in adjacent drainages. No late Pleistocene tectonic activity is apparent within the quadrangle. DISCLAIMERS: This database, identified as SIM3400, has been approved for release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this information product, for the most part, is in the public domain, it also may contain copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. REPORT FILES: The map for this report is located at and can be downloaded via the web from the U.S. Geological Survey publications website at https://doi.org/10.3133/sim3400. List of files: 00ReadMe_sim3400.txt sim3400.pdf sim3400_hillshade.pdf (map with shaded relief base added) sim3400_georeferenced.pdf (georeferenced map) How to Obtain the Digital Report Files: The map sheet can be obtained via the internet from the U.S. Geological Survey publications website. Go to the web page at https://doi.org/10.3133/sim3400 and follow the directions to download the files. The main product is a Portable Document Format (.pdf) map, which requires Adobe Acrobat for viewing. These Portable Document Format (PDF) files can be downloaded, from which paper copies may be printed. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com. How to View Data for Features in the Georeferenced PDF File: To view map attribute data for map features in Adobe Acrobat, use the Object Data Tool. In the sim3400_georeferenced.pdf file, map layers containing "Symbols" have graphic features that are visually attributed and should be turned on when printing; map layers containing "Data" have graphic features with map attribute data. If an unattributed layer overlies a Data layer, turn off the unattributed layer to select the feature using the Object Data Tool. The Shaded Relief layer must be turned off in order to select features with the Object Data Tool. Suggested citation: Ruleman, C.A., Brandt, T.R., Caffee, M.W., and Goehring, B.M., 2018, Geologic map of the Leadville North 7.5' quadrangle, Eagle and Lake Counties, Colorado: U.S. Geological Survey Scientific Investigations Map 3400, 1:24,000, https://doi.org/10.3133/sim3400. DATA FILES: The database contact is: Theodore R. Brandt 303-236-1901 tbrandt@usgs.gov U.S. Geological Survey Box 25046, Mail Stop 980 Denver, CO 80225 The data were compiled from field mapping, interpretation of lidar data and NAIP imagery. Jeremiah B. Workman (U.S. Geological Survey), and Robert M. Kirkham (GeoLogical Solutions, Alamosa, CO), reviewed the geologic map and accompanying text. This geospatial database consists of ArcInfo export files (.e00), ArcView shapefiles, and ArcGIS geodatabase files contained in a zip archive. See the list below. Please refer to the file SIM3400.met for detailed metadata documentation for this geospatial database. List of files: SIM3400.met lnbasr.tif lnbasr.tfw lnhlsd.tif lnhlsd.tfw SIM3400GIS.zip: e00 directory: lngeo.e00 lnlscarp.e00 lnxc.e00 lnpts.e00 lnpta.e00 lnptd.e00 lnptps.e00 lncosmo.e00 lnhlsd.e00 wpgcmykg.shd.e00 geol_sfo.lin.e00 geoscamp2.mrk.e00 import.aml shapefiles directory: lngeo.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) polygon lngeol.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line lnlscarp.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line lnxc.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line lnpts.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point lnpta.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point lnptd.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point lnptps.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point lncosmo.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point SIM3400GIS.gdb directory (contains GIS data as geodatabase feature classes) How to Obtain the Digital Data Files: The digital GIS files constituting the geologic map database of this report can be obtained from the U.S. Geological Survey via the Internet from ScienceBase. ScienceBase link: https://doi.org/10.5066/F7DR2TRG Suggested citation: Ruleman, C.A., Brandt, T.R., Goehring, B.M., and Caffee, M.C., 2018, Data release for Geologic map of the Leadville North 7.5' quadrangle, Eagle and Lake Counties, Colorado: U.S. Geological Survey data release, https://doi.org/10.5066/F7DR2TRG. ArcReader may be downloaded free of charge from http://www.esri.com/software/arcgis/arcreader/download for viewing additional files included in this report. This map is offered as an online-only, digital publication. Users should be aware that, because of differences in rendering processes and pixel resolution, some slight distortion of scale may occur when viewing it on a computer screen or when printing it on an electronic plotter, even when it is viewed or printed at its intended publication scale.