----------------------------Original message---------------------------- I'm a graduate student in the City University of New York's Earth and Environmental Science program. I am studying playa lakes in California/Nevada with "sliding rocks." There are about ten such playas, including the Racetrack in Death Valley National Park, Little Bonnie Claire in Nevada, among others. Although the tracks of these "sliding rocks" have been studied, I am wondering if any maps showing the trails exist. Where might I look? Are there any searchable map databases, online or otherwise, that may assist? I would appreciate any "leads" that you may have. Please direct any replies to me via e-mail at the two addresses listed below. Thank you so much! Paula Messina City University of New York/Hunter College Department of Geology and Geography 695 Park Avenue New York, NY 10021 [log in to unmask] Please also send a CC to me at: [log in to unmask]