I'm not 100% sure where this was taken but it was definitely on the Mobil Oil West Texas Geology Fieldtrip. It looks like a canyon cut into sandstones and shales with maybe flatter lying volcanics on the skyline. It may be part of Cow Heaven anticline in Big Bend National Park.

It was certainly taken from the roadside because we didn't hike into the bush at all on this trip.

Lots of bare rock walls around these parts! HWW to everyone. Enjoy the day.