Laycock Railway Cutting is the best single exposure of the Bathonian ’Fuller's Earth Rock’ in South Somerset. Ammonites indicating the Morrisi and Subcontractus zones of the Middle Bathonian are frequent. Ammonites are generally
extremely rare at this level in Britain and their presence at Laycock is of international stratigraphic importance.
The combination of features of both litho- and chrono-stratigraphical importance make Laycock Railway Cutting a key British Bathonian locality.
References
^"SSSI detail". designatedsites.naturalengland.org.uk. Retrieved 29 September 2024.