Geology

Geologic map of the Alamosa 30' x 60' quadrangle, south-central Colorado 

https://ngmdb.usgs.gov/Prodesc/proddesc_103535.htm

Geologic map of the Trinidad quadrangle, south-central Colorado 

https://ngmdb.usgs.gov/Prodesc/proddesc_9346.htm

Reconnaissance geologic map of the Cucharas Pass quadrangle, Huerfano and Las Animas Counties, Colorado 

https://ngmdb.usgs.gov/Prodesc/proddesc_5914.htm

Reconnaissance geologic map of the Spanish Peaks Wilderness Study Area, Huerfano and Las Animas Counties, Colorado

https://pubs.usgs.gov/publication/mf1542A

Igneous Petrology of the Spanish Peaks

https://www.spanishpeakscolorado.com

Cenozoic Exhumation Across the High Plains of Southeastern Colorado from (U-Th)/He Thermochronology

https://pubs.geoscienceworld.org/gsw/lithosphere/article/2023/Special%2014/lithosphere_2023_310/635708/Cenozoic-Exhumation-Across-the-High-Plains-of?utm_source=researchgate.net&utm_medium=article