Hole in the Rock

Hole-in-the-Rock is a series of openings eroded in a small hill composed of bare red arkosic conglomerate sandstone.  The sandstone was first formed some 6-15 million years ago, which has long since eroded away, leaving what looks like petrified mud cakes. The tafoni are thought to have been eroded by water. An open, shelter-like chamber in the face of the formation communicates with the rear of the formation via a hole eroded completely through the rock.

We climbed up and into the largest hole.  You can see a very large portion of west Phoenix from this vantage point.  Its a beautiful place to watch a sunset from! 

Brianna and Brian standing inside the 'hole'.