Where human and geologic time will soon meet, on the Trail of Time exhibition under construction at Grand Canyon. Photo is by Vicki Mills. Contributor: Steven Semken semken@asu.edu http://sese.asu.edu
Where human and geologic time will soon meet, on the Trail of Time exhibition under construction at Grand Canyon.
Photo is by Vicki Mills.
Contributor: Steven Semken semken@asu.edu http://sese.asu.edu
