Chiltern Society PhotoGroup

Bordering the green on the south-west is an example of Bradenham puddingstone, a 55 million-year-old conglomerate of flint pebbles in a silica matrix. It has more angular pebbles embedded in it than is found in Hertfordshire. The pebbles were eroded from the chalk and sorted by water action. In a brief period when the sea retreated due to a semi-arid climate, capillary action brought dissolved silica from underlying rocks. The water evaporated leaving the silica which hardened around the pebbles.A sarsen stone lies beyond.
Author: Q Barrett