It includes chalky limestones, siliceous earths, red clay, and, at the top, a layer of mudstone composed mainly of volcanic dust.
Nodular anhydrite (Arab Formation)Gypsum(dark lenticular shapes) in brown/grey lime mudstone (lens 2.5cm sq) What environment do these structures/textures occur in?
It includes outcrops of numerous coal seams, and several mudstone horizons yielding non-marine bivalves.
Below the cretaceous Tertiary escarpment, the low ground is underlain by soft sedimentary rocks of the Triassic Mercia Mudstone Group.
The Waterloo mudstone Formation spans the Triassic Jurassic boundary, and comprises dark gray mudstones and shales, alternating with gray limestones.