Another one from Nevada:
https://www.roadtripamerica.com/blog...ater_Panel.jpg
(Photo credit: Base Camp Las Vegas/Deborah Wall)
Elevation is 5100 feet
It is thought that dotted line could be a calendar or perhaps a time line.
And a clue about the access:
https://www.roadtripamerica.com/blog...BASI_hiker.jpg
(Photo credit: Base Camp Las Vegas/Deborah Wall)