Downstream of Armitage the solid geology is primarily Mercia Mudstones, the course of the river following the arc of these mudstones as they pass through the Midlands all the way to the Humber.
12.
The solid geology of St Werburghs comprises Triassic Redcliffe Sandstone to the south-east of Glenfrome Road, and Triassic mudstone and halite-stone of the Mercia Mudstone Group to the north.
13.
In the Taunton area Permian ( 299 252 million years ago ) red sandstones and breccia outcrop, although rocks of Triassic age ( 252 201 million years ago ) underlie much of Somerset and form the solid geology of the Somerset Moors and Levels.
