I visited the Black Canyon Petroglyph Site on the afternoon of Wednesday, November 6, 2019.  I had never heard of this site, but noticed it on a map.  It is located within the Pahranagat National Wildlife Preserve, right on Nevada Highway 93 (South of Alamo, Nevada).  The gate to the access road was locked, so I went to the visitor center, hoping to get permission to hike up to the cliff that contained the petroglyphs.  The visitor center was closed and I could not locate any park personnel, so I had to be satisfied with taking photos from the road with my long lens.  I would love to look at this site up close some day!  As a sidenote, the map I was using also identified a site off Alamo Canyon Road as “Black Point Petroglyphs”.  I didn’t have time to make the drive to this location, but perhaps next time!