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Hole in the Rock
Arch
on
Arizona Cross Cut Canal
on
Hole in the Rock Trail
in
Papago Park
,
Sonoran Desert
in
Phoenix
,
AZ
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On Wikipedia
Hole-in-the-Rock is a series of openings (tafoni) eroded in a small hill composed of bare red arkosic conglomeritic sandstone. The sandstone was first formed some 6-15 million years ago from the accumulation of materials eroding from a Precambrian granite, long since eroded away. 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. Another substantial opening exists in the "ceiling" of the chamber.
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Taxonomy
Classified As
Arch
Waterbody
Arizona Cross Cut Canal
Canal
Geologic Formation
Proterozoic granitic rocks (AZYXg;0)
Geologic Formation
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