At Helwith in Ribblesdale, the hard, dark grey-green mudstone quarried there is much in demand today for producing skid resistant roadstone.
Below the cretaceous Tertiary escarpment, the low ground is underlain by soft sedimentary rocks of the Triassic Mercia Mudstone Group.
It includes chalky limestones, siliceous earths, red clay, and, at the top, a layer of mudstone composed mainly of volcanic dust.
It includes outcrops of numerous coal seams, and several mudstone horizons yielding non-marine bivalves.
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?
On the north side of the Lagan Valley the Triassic sandstone is succeeded by reddish Triassic mudstone which does not provide a water supply.
The 3 mudstone formations There are three different mudstone formations There are three different mudstone formations found in the study area.
The geology of much of the western half of Leicestershire is dominated by the red mudstones of the Triassic aged Mercia Mudstone Group.
The Waterloo mudstone Formation spans the Triassic Jurassic boundary, and comprises dark gray mudstones and shales, alternating with gray limestones.
This arrangement of dolomitised limestone and overlying mudstone is the most common feature seen through both the prehistoric and more recent workings.