TY - RPRT TI - Sedimentology and petroleum occurrence, Schoolhouse Member, Maroon Formation (Lower Permian), northwestern Colorado AU - Samuel Y. Johnson AU - Christopher J. Schenk AU - D. L. Anders AU - Michele L. Tuttle PY - 1990 DO - 10.1306/0c9b2277-1710-11d7-8645000102c1865d UR - https://pubs.usgs.gov/publication/70016226 ID - 70016226 ER -