Hole-in-the-Rock is a series of openings (tafoni) eroded in a small hill composed of bare red arkosic conglomerate sandstone. The sandstone was first formed some 6-15 million years ago, and 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.
View in Google Earth Categories: Nature - Parks and Playgrounds, Nature - Scenic
Links: en.wikipedia.org
By: mlc1us
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