TRIAS. 



235 



in the high chff to the west comes the famous Pebble-bed, and this again overlies 

 variegated marl (Lower Marls). In the lower part of this division towards 

 Exmouth there is an alternation of marl and sandstone, and in this direction the 

 beds are much disturbed by small faults ; the strata rest upon breccia, at 

 Exmouth. Crossing over the mouth of the Exe, we come to Langstone Point, 

 and here we find a continuation of the breccia, which just appears at Exmouth. 

 The cliffs between Langstone Point and Dawlish show sandstone and breccia 

 interstratified, sometimes the one predominates, sometimes the other ; and they are 

 much faulted on a small scale. Between Dawlish and Teignmouth the dip 

 continues uniform, and the cliffs display a series of breccias witli sandstone 

 interstratified. Between Teignmouth and Babbacombe the beds undulate, but 

 they are well seen in the cliffs of Watcombe, Minicombe (or Maidencombe), and 

 Petit Tor, faulted in places against the Devonian Limestone. Here the lower 

 beds, which might be termed conglomerate, are conspicuous from the fragments of 

 limestone contained in them. (See p. 237.) The red rocks of Watcombe are 

 imderlaid by clayey beds (lOO feet), which furnish material for the Terra Cotta 

 works. At Livermead and Roundham Head, the beds appear similar to those on 

 the Dawlish coast, and the sections show breccia and sandstone, with conglomerate 

 at the base. The breccia and sandstone are shown also at Paignton, and at the 

 Thurlestone Rock, a natural arch on the coast south-west of Kingsbridge. 



There is thus a continuous series of rocks from the breccias and sandstones of 

 Dawlish and Teignmouth up into the Rhcetic Beds of Axmouth. 



Fig. 36. —The Cliff West of Budleigh Salterton, Devonshire. 

 (J. W. Salter.) 



d. Gravel. 



c. Red sandstone. 



b. Pebble-bed. 



a. Red marl. 



The Upper Marls appear on the southern edge or escarpment of 

 the Polden Hills, and are visible in several outlying hills in the 

 bordering moors. (See Fig. 39.) From Bridgewater the Marls 

 extend north-west towards Watchet, and southwards towards the 

 Vale of Taunton, where their boundary with the Upper Sandstone 

 of Halse and Fitzhead is very ill defined. The Marls border the 

 older rocks along the western side of the Quantock Hills, and thence 

 at intervals to Porlock, but they do not exhibit conglomeratic con- 

 ditions as is the case with the Dolomitic Conglomerate of the Mendip 

 Hills ; hence it appears possible that portions of these older rocks 

 were upheaved after the Triassic period. In an easterly direction 

 the Marl is overlaid by the Greensand of Blackdown. At Keshill, 

 near Broadhembury and Kentisbere, alternations of sandstone and 

 mottled clay, which dovetail together, are seen in the lane cuttings. 



Pseudomorphous crystals of Rock-salt have been noticed in the 



