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Saith Maen
Re: What criteria for a natural TMA monument?
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and the Ordnance Survey definition is simply:

A Shake Hole is a steep sided hole or funnel shaped depression in the ground. They are formed when the ground above underground cavities subsides.

http://www.ordnancesurvey.co.u[...]/freefun/geofacts/geo0051.html


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thesweetcheat
Posted by thesweetcheat
4th January 2011ce
18:59

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