It is part of the Great Oolite Group and was deposited in the Bathonian stage of the Middle Jurassic.

The predominant lithology is mudstone with thin beds of limestone and sandstone with ironstone nodules.

[1] Towards the South-West it laterally transitions into the Forest Marble Formation.

This article about a specific stratigraphic formation in the United Kingdom is a stub.

You can help Wikipedia by expanding it.This article related to the Jurassic period is a stub.