Above, a couple pictures of cross bedding in the Prospect Mountain Quartzite - once a sandstone, now metamorphosed to a quartzite. Cross bedding can tell a geologist which way was up (if the rocks are in place in an outcrop instead of lying every which way on some rock glacier!). Which way is up in photos #1 and #2? Or are the boulders too small to determine the orientation?
Photo #3 shows some faint, criss-crossing striations or grooves in a thin black shale bed remaining on one side of a quartzite boulder. Photo #4 shows similar but deeper striations or grooves on one quartzite boulder, enlarged in Photo #5. What does this mish-mash of orientations, seemingly quite random, tell us?
As usual, click to enlarge photos.
Wheeler Peak is inside Great Basin National Park