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Natural Sinkholes
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Managed By: Icon Here Natural SinkHoles
This category is for those that love sinkholes
Expanded Description:
Sinkhole Formation Photo Sharing and Video Hosting at Photobucket Photo Sharing and Video Hosting at Photobucket A sinkhole (also called a doline) is a depressed area usually formed by solution of superficial bedrock or collapse of underlying caves. The surface expression of a sinkhole is typically a conical depression or area of internal drainage. Sinkholes range in size from several square yards to hundreds of acres. They may be quite shallow or may extend hundreds of feet deep. Sinkholes are places where there is rapid recharge (replenishing) of groundwater from the surface and, therefore, are areas of potential groundwater contamination. For this reason, managing surface water and waste disposal in sinkhole-prone areas are important to maintaining good groundwater quality. The diagrams below conceptually illustrate the stages of sinkhole formation. Actual conditions in nature may be very different than those illustrated. For instance, the rock and soil layers may be thicker or thinner, the fracture and cave passage may be larger or smaller, and the surfaces are likely to be much more irregular in shape. Stage 1 For a sinkhole to form there must be an opening in the bedrock surface that allows overlying soil to move downward into a cave passage. This stage illustrates a solution-widened fracture in the bedrock choked with soil. Photo Sharing and Video Hosting at Photobucket Stage 2 Soil that collected in the cave passage in Stage 1 has been carried away by flowing water. Photo Sharing and Video Hosting at Photobucket Stage 3 Soil that collected in the fracture or bedrock opening collapses into the cave or is washed into the cave by water movement from the soil into the cave. Photo Sharing and Video Hosting at Photobucket Stage 4 Additional soil movement or collapse causes a void to form at the bedrock surface Photo Sharing and Video Hosting at Photobucket Stage 5 The void enlarges and moves upward in the soil profile, a process known as stoping. Photo Sharing and Video Hosting at Photobucket Stage 6 Eventually the void enlarges until only a thin layer of soil remains at the surface. Photo Sharing and Video Hosting at Photobucket Stage 7 Finally the thinned soil roof can no longer support itself and creates a surface collapse that may or may not choke the hole in the bedrock. Typically the initial appearance is a steep-sided hole at the surface several feet deep with a floor of soil that used to be at the surface. Photo Sharing and Video Hosting at Photobucket Stage 8 If the bedrock throat of the sinkhole remains plugged with the collapsed soil, the surface hole may fill with other eroded soil. Photo Sharing and Video Hosting at Photobucket In some instances the unstable, steep-sided surface hole may widen into a conical depression, like the upper portion of an hour glass. If the throat of the sinkhole remains open, surface water will drain readily. If the throat becomes plugged with soil, water may pond temporarily or permanently in the depression, forming a sinkhole lake. The entire process may repeat itself by starting over.
Instructions for Posting a Natural Sinkholes Waymark:
To create a waymark in this category, you must record the actual location of the Sinkhole.
To be accepted, the waymark must meet the following criteria:
1. You must provide coordinates taken at the location. 2. You must provide one or more quality pictures of the location of the Sinkhole. Neither you nor your GPSr need to be in the picture. In fact, it is preferable that you aren't in it. Mark it as the default image. Additional photographs are requested, but not required.
3. In General the Sinkhole should be at least 5' in diameter (the bigger the better)
4. Narrative Description -- Please include as much information about the location you are waymarking as you can
Instructions for Visiting a Waymark in this Category:
Please provide a photo of you and/or your GPS at the site.
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Image for Devil's Millhopperview gallery

SWSW99 km

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Natural SinkholesDevil's Millhopper

in Natural Sinkholes

This sinkhole is located in Florida's only geological state park.

posted by: Groundspeak Regular Member Team Min Dawg

location: Florida

date approved: 5/18/2007

last visited: 7/11/2018

Image for Lake Eaton Sinkhole-Ocala National Forestview gallery

SS120.4 km

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Natural SinkholesLake Eaton Sinkhole-Ocala National Forest

in Natural Sinkholes

Lake Eaton Sinkhole-Ocala National Forest

posted by: Groundspeak Premium Member crackergals

location: Florida

date approved: 12/31/2008

last visited: 11/29/2019

Image for Devil's Den Sinkhole - Williston, FLview gallery

SWSW129.2 km

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Natural SinkholesDevil's Den Sinkhole - Williston, FL

in Natural Sinkholes

A sinkhole is located on top of Devil's Den in Williston, Florida.

posted by: Groundspeak Premium Member Marine Biologist

location: Florida

date approved: 2/1/2008

last visited: 1/18/2013

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