This report, developed as part of the Community Geothermal Heating and Cooling Design and Deployment initiative, presents subsurface and seismic interpretations for Carbondale and the surrounding Roaring Fork Valley. The analysis incorporates historical well data, seismic data, geological maps, and cross-sections. Both visualizations and written interpretations of these materials are provided in the report. Authored by retired geophysicist Don Marlin for the Clean Energy Economy for the Region (CLEER) team, the report was prompted by the discovery of a sinkhole in Carbondale. The report is a component of the Carbondale Community Geothermal Coalition's efforts to establish a zero-energy district, which include the design and planned deployment of a thermal energy network for community buildings in Carbondale.