TY  - RPRT
TI  - Age and tectonic setting of lower Paleozoic alkalic and mafic rocks, carbonatites, and thorium veins in South-central Colorado
AU  - Jerry C. Olson
AU  - Richard F. Marvin
AU  - Raymond Laurence Parker
AU  - Harald H. Mehnert
PY  - 1977
UR  - https://pubs.usgs.gov/publication/70233484
ID  - 70233484
ER  -