Forest trees are currently growing on both sites, but there are small accessible exposures on the sides of quarry and roadway cuttings.
The sites offer exposures of a mid-Purbeck Lagerstätte, fine-grained limestone rock with good conditions for fossilization.
[1] These rocks and fossils were deposited after shallow seas receded about 146 million years ago.
They record a warm environment of lakes and coastal lagoons, with occasional marine transgressions such as the Cinder Bed.
[5] These beds formed the main material for Peter Bellinger Brodie's "Insects in the Secondary Rocks of England", a seminal work and still significant today.