The top two photos are of the entrance which was

down a wash which always had trees across it. 

The entrance ran from the south to the north.

The two photos above are of the east side of the ring (looking north). 

A large dug out arrow fire pit can still be seen in the center of the ring.

The west side of the ring (looking north).

The ring was abandoned in the early 1980s (?)

and a new ring built farther into the Camp Osborn woods.