File:Rills (Endless Caverns, Virginia, USA) (30545962014).jpg

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Rills in Endless Caverns in Virginia, USA.

The subparallel grooves incised on the sloping limestone surface shown above are rills, which are vadose dissolution features (= formed above the water table in a cave). Slightly acidic water running downward along the rock surface (this follows cave passage flooding events) will dissolve some of the limestone, leaving a series of shallow, parallel channels.

The publicly accessible portions of Endless Caverns are developed in structurally tilted carbonates of the New Market Limestone (Middle Ordovician). Other portions of Endless Caverns are in overlying units: the Lincolnshire Limestone and the Edinburgh Formation.

Locality: Endless Caverns, south of the town of New Market, eastern Rockingham County, northern Virginia, USA
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Source Rills (Endless Caverns, Virginia, USA)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30545962014 (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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Date/TimeThumbnailDimensionsUserComment
current13:34, 12 October 2019Thumbnail for version as of 13:34, 12 October 20194,000 × 3,000 (4.65 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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