NABSQNO 14S-609400-4327600

NABSQNO 14S-609400-4327600.
An unnamed irregular natural arch, Ottawa County, Kansas
Photo by Jay Wilbur

Example Irregular Natural Arch

NABSQNO 14S-609400-4327600. This unnamed miniature natural arch has eroded through a remnant calcite concretion of Dakota sandstone. The boulder it penetrates is one of several roughly-spherical concretions that are the attraction of Rock City, a private park that charges the public a modest fee to access these geological oddities. Rock City is located about 3 miles southwest of Minneapolis, in Ottawa County, Kansas. Because the process of erosion that formed the arch is atypical and probably unique, this natural arch is classified as an irregular natural arch. It is sometimes called "Donut Rock".

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Other Irregular Natural Arch examples:

Woodpecker Rock Keystone Arch Buffalo Rock unnamed arch

© 2009 by Jay H. Wilbur, All Rights Reserved.