Stratigraphic range: Permian
The Maroon Formation is a geologic formation in Colorado. It preserves fossils dating back to the Permian period. It is the primary formation of sandstone that lends the vivid red color to the hills around Glenwood Springs, Colorado.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
- Colorado Geological Survey. "Guide to the Geology of the Glenwood Springs Area, Garfield County, Colorado" (PDF). Retrieved 31 August 2015.