http://www.cmdrmark.com/devilspunchbowl.html
Devil's Punch Bowl (Diana's Punch Bowl) GPS N39 01' 50.4" W116 40' 04.5" 36 miles north of Belmont off SSR82 Road factor/Accessability - pitted graded dirt/gravel ~301 miles from Las Vegas Sounds like that in addition to the sinkhole, there's a cave. Probably have to enter through the sinkhole which has a hot spring.
