MI-33 Surface Vitrinite-Reflectance Map of the Uinta, Piceance, and Eagle Basins Area, Utah and Colorado Download Publication Details Originally U.S. Geological Survey Map MF-2008-B. Text discusses sampling and analytical techniques, problems associated with surface sampling, vitrinite reflectance as a tool for resource evaluation, and other sources of data. Table shows location, age, and vitrinite reflectance data for surface samples from the Uinta, Piceance, and Eagle Basins. 21 pages. 1 plate (1:500,000). The map plate is followed by the USGS report. Digital PDF download. MI-33D Citations Nuccio, Vito F., and Ronald C. Johnson. “MI-33 Surface Vitrinite-Reflectance Map of the Uinta, Piceance, and Eagle Basins Area, Utah and Colorado.” Vitrinite-Reflectance. Miscellaneous Investigations. Denver, CO: Colorado Geological Survey, Department of Natural Resources, 1988. https://coloradogeologicalsurvey.org/publications/surface-vitrinite-reflectance-map-uinta-piceance-eagle-basins-utah-colorado.