- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
The Malvern hills lie between Gloucester and Birmingham in western England and are composed of crystalline gneisses somewhat comparable to the Lewisian of Scotland. Cambrian and Silurian strata overlap the crystallines. Earlier work has postulated a fault boundary along the western side, with Silurian faulted against the crystallines. More recent work on the east, where the eastern margin is claimed to be a pre-Triassic unconformity rather than a fault, has led to a reconsideration of evidence on the west, and the presence of a "western boundary fault" is now doubted. It is shown that the Malverns were uplifted vertically in pre-upper Llandovery time and that a large unconformity exists below the Silurian.