Beans;
The drawings you asked about are petroglyphs, and are in the sandstone of the El Paso Mtns, but are in the wilderness area, that I go ride my horse in. If you are familiar with the area, it is off of E-15, and east of the Holland Camp mine site.
I do not want to advertise them much, as so many of them have been vandalized, and this IS a public forum.
If you are up in the Bishop area, really extensive Petroglyphs remain along the Hwy 6 road toward Benton Crossing, and several tours go there. Also there are a lot at Fossil Falls, in the Coso Mtn area, east of Hwy 395.