The Blisworth Limestone is a stratum of limestone of the Bathonian stage, found in the Jurassic ridge which extends north and south through England. It was laid down in the shallows of the Jurassic sea and is part of the more widely defined Great Oölite Series. It is also known as the Great Oolite Limestone. From the Jurassic ridge it extends eastwards below the later deposits and in the North Sea terminology, it is part of the West Sole Group. (Cameron p. 74)