Gary J. Axen Martin J. Grove Bernard Housen George Jefferson Kristin McDougall-Reid Lyndon Murray Michael E. Oskin Tom Peryam Jolante W. van Wijk Elaine Young Rebecca J. Dorsey 2021 <p>No abstract available.</p> application/pdf 10.1130/G49145C.1 en Geological Society of America Redefining the age of the lower Colorado River, southwestern United States: Comment article