VOL. XIV. (1) PRE-RH/AETIC DENUDATION 57 
band between Watchet and South Devon. This Trias 
thickens out to the south, and in North Devon attains a 
maximum of from-2,000 to 3,000 feet." The lower beds 
were regarded as Permian by Murchison; but they are 
at least of Bunter age. The sea, or an inland lake, must 
therefore have lain in that direction in Lower Triassic 
times. The river occupying this line, if we may assume 
its existence, probably received other tributaries flowing 
parallel to the Channel river, for a tongue of Trias runs 
up from the main band past Tiverton to the west, and 
another, of much greater length, strikes into the heart 
of the Culm Measure series, as far as a little north of 
Oakhampton. 
1 Ussher, Quart. Journ. Geol. Soc., Vol. xxxii., p. 392. 
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