The University of Arizona Press

Markes E. Johnson is the Charles L. MacMillan Professor of Natural Science, Emeritus, at Williams College, where he taught historical geology, paleontology, and stratigraphy in the Geosciences Department for thirty-five years. He studied at the University of Iowa and University of Chicago. Since 1989, he has been a frequent visitor to Mexico’s Baja California, where his research examines coastal landscapes formed when sea level and global temperatures were higher than present day.