The standard also can be used for different kinds of special-purpose or derivative map products and databases that may be focused on a specific geoscience topic (for example, slope stability) or class of features (for example, a fault map). Note: some sections containing more than one EPS file have been placed in a ZIP archive. Questions, comments, suggestions?
Geologic Map Symbolization. To the extent possible, symbols and specifications were retained from previous informal and draft standards (the USGS "Technical Cartographic Standards", ca. A limited number of paper copies will soon be available. Section 33 - Suggested Ranges of Map-Unit Colors for Volcanic and Plutonic Rocks and for Stratigraphic Ages of Sedimentary and Metamorphic Rocks Basics Table--Geologic Map Symbols Created by Ralph L. Dawes, Ph.D. and Cheryl D. Dawes, including figures unless otherwise noted updated: 7/10/11 Unless otherwise specified, this work by Washington State Colleges is licensed under a Creative … Be aware, however, that reducing lineweights below .125 mm (.005 inch) may cause symbols to plot incorrectly if output at higher resolutions (1800 dpi or higher).
To help locate a symbol or group of symbols of interest, a PDF version of each section's EPS file also has been prepared. Non-Federal agencies and private companies that produce geologic-map information are urged to adopt this standard as well. In addition, the EPS file for an individual page in the standard can be downloaded from the PDF file of that page by following the links in the upper right-hand corner in the PDF file. This draft standard also includes a newly revised CMYK color chart, a chart of commonly used geologic map patterns, a geologic age symbol font, and a variety of bar scales, mean declination arrows, and quadrangle location maps.The standard is designed for use by anyone who either produces or uses digital geologic-map information.
The final standard document was formally approved as an FGDC standard in August 2006. Geological Map Symbols inclined strata, dip in degrees horizontal strata vertical strata axial surface trace of antiform axial surface trace of synform fold hinge line, fold axis or other linear structure, plunge in degrees inclined cleavage, dip in degrees horizontal cleavage vertical cleavage geological boundary fault line, mark on downthrow side younging direction of beds metamorphic aureole NOTE: …
More information These PDF files can be downloaded or, depending on browser settings, viewed by clicking the "PDF" links below. The Federal Geographic Data Committee.
To find the location of a particular symbol in the various sections, please consult the detailed The standard is scale-independent, meaning that the symbols are appropriate for use with geologic mapping compiled or published at any scale. In the FGDC Digital Cartographic Standard for Geologic Map Symbolization document, the symbols are contained in "Appendix A," which is divided by feature type into sections.
Accessible from the links below are Illustrator EPS files of each section, provided in both Illustrator 8 ("AI8") and "CS2" formats. To assist in the review of this standard during its development, a Public Review Draft standard document ("Public Review Draft Digital Cartographic Standard for Geologic Map Symbolization") was released in May 2000. U.S. Department of the Interior U.S. Geological Survey Reading Topographic Maps Interpreting the colored lines, areas, and other symbols is the fi rst step in using topographic maps. For guidelines on symbol usage, as well as on color design and map labeling, please refer to the standard's In addition, the earlier PostScript Implementation of the Public Review Draft of the standard (USGS Open-File Report 99-430, "Public Review Draft Digital Cartographic Standard for Geologic Map Symbolization (PostScript Implementation)") has been updated to reflect changes in the now-approved standard, and the revised PostScript Implementation is presented herein as USGS Techniques and Methods 11-A2. This standard is intended to provide to the Nation's producers and users of geologic-map information a single, modern standard for the digital cartographic representation of geologic features. Please contact Dave Soller and Taryn Lindquist. Accordingly, the symbols in this PostScript Implementation of the standard also are grouped into sections. Features are shown as points, lines, or areas, depending on their size and extent. This standard allows the use of any symbol that doesn't conflict with others in the standard, provided that it is clearly explained on the map and in the database.