This rocky ledge was along the edge of the trail. I think it is mostly limestone. The rock seems to be fairly soft and full of lines, and holes. The holes sometimes hold water that birds and small wildlife drink. Lost hikers and travelers have looked for holes in rocks where water can collect in any outdoor setting. There are also lots of fossils in the rocks that confirm the fact that the Sandia's were under water, either an ocean or sea many, many, many years before man.