TY - RPRT TI - Seismic constraints on the nature of lower crustal reflectors beneath the extending Southern Transition Zone of the Colorado Plateau, Arizona AU - Thomas E. Parsons AU - John M. Howie AU - George A. Thompson PY - 2012 DO - 10.1029/92jb00947 UR - https://pubs.usgs.gov/publication/70138207 ID - 70138207 ER -