The Yosemite Forum for January will be held in the Yosemite Valley Auditorium, Tuesday, January 13, 2015, from Noon to 1 p.m. for the Yosemite Forum. The subject, “Geologic Limits on Life in Mountain Landscapes” will be presented by Clifford Riebe, Department of Geology and Geophysics, University of Wyoming, Laramie and the Southern Sierra Critical Zone Observatory.