Raven Run Sinkhole
In Kentucky, United States
Size:  (not chosen)
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This Earthcache is located on the Green Trail at the Raven Run Nature Sanctuary in Lexington, Kentucky. Raven Run is a Lexington City Park and daily hours vary by season. Please stay on the marked trails.
This EC is located on the Green Trail northeast of the Raven Run Nature Center. Be sure to log in on the hiking log at the Nature Center prior to heading out on the trails and grab a trail map from the box above the log book. From the Nature Center head North then turn right (East) on the Green Trail. The posted coordinates will take you to a sinkhole next to the trail.
Kentucky’s terrain is dotted with sinkholes like this one, most of which are a result of the Commonwealth’s world famous karst topography. Karst is a type of landscape characterized by tunnels, caves and sinkholes which are formed by groundwater dissolving soft sedimentary rock such as limestone. Water penetrates and dissolves the limestone creating fissures which are further widened by the increased water flow creating larger spaces in the rock. This sinkhole is located in what is referred to as the “inner bluegrass karst area” which is considered an area of high potential for karst.
Raven Run Sink Hole
Sinkholes can range in size from quite small to very large and are often formed by collapsing caves below. Once formed, sinkholes serve as collection points for surface water runoff which is then funneled into the groundwater table. Due to the ease at which surface runoff penetrates into the groundwater table in karst areas, they are considered very susceptible to pollution.
To log this Earthcache you must post a picture of yourself or your team (I don’t accept pictures of hands) with this sinkhole in the background. Please don’t log the smiley until you have a picture READY TO POST and email me the answers to the following questions:
1. Estimate the length, width and depth of this small sinkhole.
2. Why are karst areas especially susceptible to pollution?
Pictures must be posted and you must answer the questions to get credit for the cache. Photos must include faces, not just hands. If these requirements are not met, your log may be deleted. I am no geologist. Information for this Earthcache was gathered from books and internet sources that are available to the general public.
WH1266FD at the Raven Run Sink Hole
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Last Updated: on 11/10/2013 9:55:35 AM (UTC-08:00) Pacific Time (US & Canada) (5:55 PM GMT)
Coordinates are in the WGS84 datum