Caption
A PDC (polycrystalline diamond compact) type oil field drill bit on one othe Kimmeridge ledges. Kimmeridge Bay, Dorset, UK, March. The ledges are hard Jurassic age, carbonate rich horizons of Limetone and Dolomite that are more resistant to erosion than the overlying mudstone and Shale. The dark shales are Kimmeridge clay, a hydrocarbon source rock for many oilfields in Europe.
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