From Wikipedia:

..a 2¾ acre (1.13 hectare) geological Site of Special Scientific Interest near the village of Felton, North Somerset, notified in 1997.

The site has an excellent exposure of an irregular unconformity surface lying between inclined Lower Carboniferous (Dinantian) Black Rock limestones and flat-bedded Upper Triassic (Rhaetian) strata.

Disused and used as landfil?

SSSI