Notes on the Geology of the Valleys of the Upper Part of the River Teign and its Feeders

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Abstract
A memoir on “The Bovey deposit,” by J. H. Key, Esq., was read before the Geological Society of London, on November 20th, 1861†; and a memoir “On the Lignite and Clays of Bovey Tracey, Devonshire,” by W. Pengelly, Esq., was read before the Royal Society November 21st, 1861‡. The district noticed in the following pages consists of the portions of the valleys of the River Teign and its feeders, that lie north of that described in these papers. The Teign is formed for the most part by the North and South Teigns, the Walla Brook, Easter Brook, and Bovey River. The South Teign rises near Fernworthy, about 1400 feet above the sea level§, and joins the North Teign at Leigh Bridge. The North Teign rises on Dartmoor, about 1600 feet above the sea-level, near the upper end of a valley that is crossed at its western extremity by the East Dart; and near the Tolmen, 1192 feet above the sea, it receives the Walla Brook, which brings the drainage of an extensive granitic district to the north. Both these streams, near and at their junction, run in artificial courses, walled at the side with blocks of granite, and cut through a rising bank, the diversion having probably been made by tin-streamers to drain the broad level that occupies a hollow of the hills at this point. From this place the North Teign runs in a narrow gorge to a level in an opening of the hills at Gidley Park, where

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