Bucks Earth Heritage Group

Purbeck

There are no exposures of this rock at the moment, but they used to be seen in the Bugle Pit SSSI and could sometimes be ploughed up at the surface in west Bucks. These sediments were deposited in very salty lagoons at the edge of an ocean around 140 million years ago. Fossils such as the stromatolites and gastropods found in this rock testify to the high salinity.