The Geologic Hazard area and symbology was based upon the map that can be viewed using this link: https://pubs.usgs.gov/imap/i-2735/i-2735.pdf The GIS-Data needed to create the Weld County Geologic Hazard area can be obtained from this link to the USGS Interactive Map of the Colorado Front Range Infrastructure Resources: https://pubs.usgs.gov/ds/2006/193/ Select Download GIS Data and a file called FrontRange_Shapefiles.zip (124 MB) will be downloaded. After extracting the content of the zip file, these are the shapefiles that are most relevant: Frifaultu - Bedrock faults Frimndpthu - Depth of cover above abandoned coalmine workings friminedu - Areal extent of underground coal mines frivshaftu - Mine Shaft (hoisting shaft) friairshtu - Air Shaft friaditu - Adit (rock slope entry)