The evolving sedimentological picture of the lower Colorado River system before and after engineering efforts to control flow.

AZGS has a strong presence at GSA-2019 in Phoenix, Arizona, on the week of 22 Sept. 2019.

As a newly minted faculty member in geology at the University of Wisconsin in 1964, the opportunity to join Bob Dott in co-teaching our traditional summer “field mapping” course was one I could not refuse.