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Oakenhill Railway Cutting
Oakenhill Railway Cutting () is a geological Site of Special Scientific Interest in Gloucestershire, notified in 1985.〔(Natural England SSSI information on the citation )〕〔(Forest of Dean District Local Plan Review, adopted November 2005, Appendix D 'Nature Conservation Site Designations Within the Forest of Dean District', Sites of Special Scientific Interest )〕
The site is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS).〔(Forest of Dean District Local Plan Review, adopted November 2005, Appendix D 'Nature Conservation Site Designations Within the Forest of Dean District', Key Wildlife Sites )〕
==Location and geology==
The site is in the Forest of Dean near Yorkley and adjacent to Oakenhill Wood, and provides significant exposures of rock outcrops of the Carboniferous age. They were formed some 300 million years ago. The exposures are mostly shale layers which are separated by thin sandstones or coals. They are known as the Supra Pennant Group, and are a subdivision of the Coal Measures. The site is the only exposure of this kind in the Forest of Dean, and supports research into the geological development of the area through its fossil content. The area is central in relation to other Coal Measures in southern Britain.〔
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