1.—On a Group of Slate Rocks ranging E.S.E. between the rivers Lune and Wharfe, from near Kirby Lonsdale to near Malham; and on the attendant Phænomena.

Abstract

General Remarks Though the secondary rocks which form a crescent around the Cumbrian Lake district are in general arranged with much regularity, geologists are aware that in consequence of dislocations of some strata and unconformed positions of others, the beds do not always appear at the surface in the order of their consecutive deposition. The great fault under Cross Fell, investigated by Dr. Buckland, and the double range of limestone scars which stretch to the west and north from under Wild Boar Fell, would have been much less difficult of explanation but for the unconformed deposit of red marl and sandstone in the vale of Eden, upon the depressed range of limestone. In some parts around the Lake mountains, the obscuration of certain secondary rocks may be ascribed wholly to the over-extension of new red sand­stone; as from Egremont to Low Furness, where this rock is brought into contact with granite and slate, to the exclusion of coal-measures, limestone, and old red sandstone;—and sometimes, without any considerable deposit of unconformed rocks, great interruptions in the lines of strata are caused by sudden variations of dip, or remarkable dislocations. A full account of the variations which are produced by the causes above-mentioned, on the direction and appearance of the secondary rocks round the Lake district, would be highly serviceable to the cause of inductive geology. The observations in the present communication are restricted as much as possible to the illustration of the phaenomena connected with a group of rocks, aberrant