SSSI 1975 cited:

The site, lying 2km east of Beith, encompasses an active limestone quarry. It
exposes the Dockra Limestone of the Dinantian (Lower Carboniferous) Lower
Limestone Formation, which is approximately 330 million years old. Here this unit
shows a reef-mount development which laterally passes into transitional bedded
limestones, collectively showing a great diversity of carbonate microfacies. The
fauna associated with the limestones is also very diverse and of very great
palaeontological interest, and it includes many brachiopod species. A key site for
studies of facies and faunas in the Lower Carboniferous rocks of Scotland.