FGDC Digital Cartographic Standard for Geologic Map Symbolization

This document provides a single national standard for the digital cartographic representation of geologic map features. This standard is intended to support the Nation's producers and users of geologic map information by providing line symbols, point symbols, and colors and patterns that can be used to portray the various features on geologic maps. The objective of this standard is to aid in the production of geologic maps and related products, as well as to help provide geologic maps and products that are more consistent in both their appearance and their underlying database content. A geologic map is a cartographic product that expresses information about the geology of a particular area. The map uses graphical elements such as line symbols, point symbols, and colored or patterned areas to portray complex geological information such as the composition, age, genesis, and extent of an area's geologic materials, as well as the geometry, orientation, and character of the geologic structures that have deformed them. Geologic maps generally are intended for use by both the geoscience professional and the general public; however, designing and preparing a geologic map that will inform such an audience can be a daunting task because of the complexity of both the mapping concepts and the geologic information. The imperative for clear communication of geologic map information to a diverse audience was outlined early in the history of the U.S