File:Dripping Rock Cave - boulder rubble in oolitic calcarenitic limestone (San Salvador Island, Bahamas) 2 (16204173338).jpg
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| Description |
Dripping Rock Cave (looking ~SW), southwestern San Salvador Island, eastern Bahamas. Dripping Rock Cave is hosted in aragonitic, oolitic calcarenite limestones of the Cockburn Town Member of the Grotto Beach Formation (Upper Pleistocene). This cave is a good example of a breached flank margin cave. Flank margin caves form at the flanks of carbonate islands and at the margins of fresh-groundwater lenses. As such, flank margin caves are phreatic features. In the vicinity of the seawater-freshwater mixing zone (halocline) of a groundwater lens (see diagram - www.carbonatecreek.com/caves/images/carbisland.gif), relatively rapid dissolution of limestone occurs due to the high aggressivity of the water. Limestone dissolution at Dripping Rock Cave occurred during the MIS 5e highstand (early Late Pleistocene ~119-131 ka). Flank margin caves have no surface entrances. Access to flank margin caves occurs only after surficial erosion intercepts chambers or passages. Dripping Rock Cave was erosionally breached by the development of a wave-cut, paleo-sea cliff during the mid-Holocene. The bedrock floor is about 8 feet down from the present, sandy floor of the cave. Sediments have been flushed into the cave during the middle to late Holocene. Some travertine speleothem (dripstone) has been been partially buried by these sediments. A second generation of travertine dripstone is forming on the present, sandy cave floor (stalagmitic dripstone on sediment fill). The above photo shows a large rubble clast buried in aragonitic beach sands. The rocks hosting the clast have gently seaward dipping beds consistent with a beach facies. The large clast shows an aberrant dip, and represents a rotated boulder of paleo-beach rock that got cemented up after burial. |
| Date | |
| Source | Dripping Rock Cave - boulder rubble in oolitic calcarenitic limestone (San Salvador Island, Bahamas) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/16204173338. It was reviewed on 2 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 21:09, 2 March 2015 | | 3,008 × 2,000 (2.8 MB) | Jacopo Werther (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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