This small, though extremely interesting area of Carboniferous Limestone is situated about 4 miles north-east of Bridgwater and ¾ mile north-east of the village of Cannington.

For several reasons it has attracted a large number of workers. Fossils are scarce (at first the mass was thought to be unfossiliferous), and hence for a long time the “Devonian or Carboniferous” question of age was a bone of contention. Also, the final acceptance of its Avonian age showed that productive Coal Measures were probably deposited in the area between the Mendips and the Quantock Hills.