I expect that most people who know Colwick and Sneinton see the reddish brown cliff face along side the loop roop road / Rail way line quite often, know locally as Colwick Cutting.
Locals at one time used to call the cliffs "Deadmans drop", some maybe still do ? As far as the Geologists are concerned this is the oldest and deepest sedimentary rock formation East of Nottingham.
Known to them as the "Sneinton formation" a 10-20 metre thick reddish brown layer of inter-bedded sandstone, siltstone and mudstone from the middle and upper Triassic period, about 200 million years ago !!
Below these mudstone cliffs is a bed of sandstone which can be seen in various places around the city, the obvious is Nottingham Castle. So there we have it, the Sneinton formation is Mercia Mudstone dating back some 200 Million years, if only trees and rocks could talk, what a story they would tell !!!