GIS data for preliminary geologic map of the Greeley 1 degree x 2 degrees quadrangle, Colorado and Wyoming

This U.S. Geological Survey (USGS) data release provides a digital geospatial database for the preliminary geologic map of the Greeley 1 degree x 2 degrees quadrangle, Colorado and Wyoming (Braddock and Cole, 1978). Attribute tables and geospatial features (points, lines and polygons) conform to the Geologic Map Schema (USGS NCGMP, 2020) and represent the geologic map as published in USGS Open-File Report 78-532 (Braddock and Cole, 1978). The 4.7 million-acre map area represents the geology at a publication scale of 1:250,000. The purpose of this data release is to provide Geologic Map Schema (GeMS)-compliant data for the preliminary geologic map of the Greeley 1 degree x 2 degrees quadrangle, Colorado and Wyoming (Braddock and Cole, 1978). Development and publication of modern GIS data for geologic maps is foundational and high priority to the USGS Mineral Resources Program (MRP) to facilitate on-going research and other activities pertaining to critical mineral deposits, geologic and geophysical mapping efforts, petrologic studies, and mineral resource assessments.