DIGITAL DATABASE FOR THE QUATERNARY GEOLOGIC MAP OF THE VICKSBURG QUADRANGLE, UNITED STATES, MISCELLANEOUS INVESTIGATIONS SERIES I-1420 (NI-15) Edited and integrated by Gerald M. Richmond, David S. Fullerton, and David L. Weide State compilations by Drew F. Holbrook, William A. Gilliland, Kenneth V. Luza, David E. Pope, E. Gerald Wermund, Robert A. Miller, William V. Bush, Kathryn M. Jensen, and William D. Fishman 1990 Miscellaneous Investigations Series Map I-1420 (NI-15) Digital edition 2012 by Charles A. Bush INTRODUCTION Files available through this site represent the digital component of the VICKSBURG Quadrangle of the Quaternary Geologic Atlas of the U.S., Miscellaneous Investigations Series, Map I-1420 (NI-15). The files contain .e00 files, and pdf files of the map's illustrations and correlation diagram, and pdf files of the map unit descriptions and sources of information. An ARC/INFO aml, keyfiles and shadeset are included to produce the plot of the data. DISCLAIMERS This database, identified as I-1420 (NI-15), has been approved for release and publication by the Director of the 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 implies 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 U.S.Geological Survey 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. Government. Although this information product, for the most part, is in the public domain,it also contains copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. CONTACT INFORMATION Charles A. Bush U.S. Geological Survey (303) 236-4723 cbush@usgs.gov CONTENTS README.txt The following ARC/INFO export coverages are included in vicksburgGIS.zip: geo_net coverage includes polygons that are map units and open water, and arcs that are Contact, Shoreline, null, and Map Boundaries. Null lines are arbitrary lines separating bodies of water. geo_net.pat INFO file consists of the following items: GEOCODE--Refers to the type of polygon and is either the map unit symbol, or Lake or River. MAPUNITS--A description of the deposits and materials that make up the map units; blank where not applicable. (See below.) See textonly file for full unit descriptions. AGE--Refers to the age of the map unit and is one of the following: EARLY PLEISTOCENE TO PLIOCENE(?), HOLOCENE, HOLOCENE AND LATE WISCONSIN, LATE PLEISTOCENE, LATE PLEISTOCENE AND MIDDLE PLEISTOCENE, LATE PLEISTOCENE TO EARLY PLEISTOCENE, MIDDLE PLEISTOCENE, QUATERNARY AND TERTIARY, or blank where not applicable. MODIFIER--Refers to the names of certain bodies of water. COLOR--An integer value representing a shade pattern in the shadeset color524.shd used in preparing the plotfile of the map. geo_net.aat INFO file consists of the following item: LTYPE--Refers to the type of arc and is one of the following: Contact, Shoreline, null, or Map Boundary. vick_pnt is a point coverage indicating the location of Pleistocene volcanic ash beds. The vick_pnt.pat INFO file consists of the item TYPE and is defined as PLEISTOCENE VOLCANIC ASH BED. hydr_lin is a line coverage created after scanning and vectorizing the hy