My first though was Little Flat Top, heading west out of the San Rafael Desert. But I checked my photos and that's not it. It's definitely not along the Little Wild Horse road because the Summerville layers are much higher up along the entire length of that road between GV and the LWHC parking lot (it's all Entrada Sandstone down at the level of the road). So, I'm going to have to go with the
Green River Cutoff Road, where it passes near the highest point of the Woodside Anticline. There's really not a name for this specific location, but it's about halfway between El Rancho Not So Grande and US-6.
Edit: The more I think about this, the more I'm sure of my guess. Check out pages 11 and 15 of Desert Magazine from June 1951 for photos of the same formation:
http://www.scribd.com/doc/2403358/19...zine-1951-June
I've done some exploring around there and have even been up on the southern flank of that butte on an old mining road.