A guide to some common symbols found on geologic maps. Includes strike and dip, vertical strata, horizontal strata, anticline axis, syncline axis, plunging anticline axis, plunging syncline axis, and strike-slip fault. For more details and symbols, see the FGDC Digital Cartographic Standard for
Geologic Map Symbolization at <a rel="nofollow" class="external text" href="https://ngmdb.usgs.gov/fgdc_gds/geolsymstd/download.php">the official website</a>
<a href="//commons.wikimedia.org/wiki/User:CrunchyRocks" title="User:CrunchyRocks">CrunchyRocks</a>, after Randa Harris
CC BY-SA 3.0
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