File:Travertine crust (Ohio Caverns, western Ohio, USA) (30783960962).jpg

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Ohio Caverns is the largest cave system in Ohio. It is located in a bedrock knob called Mt. Tabor on the southern side of the Bellefontaine Outlier (= Ohio's elevationally highest area). The cave is hosted in the Middle Devonian Columbus Limestone, which is part of a widespread shallow marine carbonate succession in eastern and midwestern America.

The general term for all secondary mineral deposits occurring in caves is speleothem. Between 200 and 300 different minerals have been reported to occur in various speleothems around the world. The most common speleothem minerals are calcite (CaCO3), aragonite (CaCO3), and gypsum (CaSO4·2H2O). Calcitic speleothem is given the rock name travertine.

Varieties of cave travertine are named based on morphology and origin. The most common type is dripstone, formed by dripping water. Examples include stalactites, stalagmites, and columns. Other varieties include flowstone, knobstone (a.k.a. coralloids), helictites, shelfstone, rimstone, cave pearls, frostwork, etc.

Shown above is a cave wall-ceiling with a relatively thin crust of travertine that is coating limestone. Some of the underlying limestone is exposed (= gray patches). The yellowish and yellowish-brown coloration is from iron oxide staining.

Locality: Ohio Caverns, Mt. Tabor, east of the town of West Liberty, northern margin of Champaign County, western Ohio, USA

For a recent technical article on the geology of Ohio Caverns, see:

<a href="http://scholarcommons.usf.edu/ijs/vol45/iss1/7/" rel="nofollow">scholarcommons.usf.edu/ijs/vol45/iss1/7/</a>
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Source Travertine crust (Ohio Caverns, western Ohio, USA)
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30783960962 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 October 2019

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current13:39, 12 October 2019Thumbnail for version as of 13:39, 12 October 20193,989 × 2,367 (6.4 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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