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Colorado Geological Survey (COGS), as part of the United States Geoscience Information Network (USGIN), provided a geologic map from the United States Geological Survey (<a href="http://pubs.usgs.gov/of/2005/1351/#CO" target="_blank">http://pubs.usgs.gov/of/2005/1351/#CO</a>). US-CO_COGS_500k_Geologic_Age (1 of 2 layers provided in this service) is a compilation dataset containing geologic units covering the State of Colorado at 1:500,000 scale. The data table includes geologic name, description, lithology, and geologic history. The data in this layer is portrayed based on geologic age. |