TY - RPRT TI - Palaeomagnetism and magnetic–polarity zonation in some Oligocene volcanic rocks of the San Juan Mountains, south–western Colorado AU - J. F. Diehl AU - Myrl E. Beck AU - Peter W. Lipman PY - 1974 DO - 10.1111/j.1365-246x.1974.tb01242.x UR - https://pubs.usgs.gov/publication/70246995 ID - 70246995 ER -