SERIES OF THE DEVOIS" COAST-SECTION. 



159 



(6) The deep rich red colour of the rocks of the breccia-series 

 and the marls, as compared with the comparative absence of colour 

 in the Bunter (except on weathered surfaces), is another (though 

 minor) poiut of distinction. This difference extends even to the 

 colour of the soils, the deep crimson -red of the fresh-ploughed 

 fields over the area occupied by these rocks being (as in the 

 Thiiringen country) at once distinguished by the eye from the 

 reddish-brown colour of the soils of the Triassic region *. 



(7) The admixture (as jjointed out above) of materials derived in 

 all probability from these breccias with materials from more 

 distant sources in the Eudleigh-Salterton pebble-bed. 



(8) What is perhaps the most significant fact of all after (7) is the 

 difference between the general direction (if there is one) of the dip 

 (and consequently of the strike) of the breccia-series as compared 

 with that of the true Triassic series. 



In the study of the diagram (fig. 1) which accompanies Mr. 

 TJssher's paper (Quart. Journ. Geol. Soc. loc. cit.) it is obviously 

 necessary to bear in mind the fact that the coast-line at the mouth 

 of the Exe takes a turn to the south, and the general dip for that 

 portion of the section is nearly in the direction north. 



In the upper part of the Crediton Yalley about a mile above Yeo- 

 ford Station, some fine railway-sections show a dip of 10° W. (20° S.). 

 It is well seen in the cutting on the Plymouth line, which is in the 

 plane of dip, as proved by the horizontal strike of the beds (1) in 

 the vertical weathered face of an older section at right angles to 

 this line, (2) in the cutting near by on the Barnstaple line, which 

 by the compass is at right angles to the Plymouth line. The 

 direction of the dip and the nature o£ the detritus both point to the 

 great felspathic outburst of the Posbury Hills to the east as the 

 source of the materials. Mr. Ussher records a similar local dip of 

 10° S. on the north side of the valley (p. 391). 



There is a very fine fresh section just south of Dawlish, the cliff 

 having been recently shorn down to a smooth surface, where the 

 fall of the cliff happened some two years ago. A comparison of the 

 beds, here laid bare in the most perfect fashion, with the beds which 

 rise to the south on the other side of the gorge reveals the presence 

 of a fault with a downthrow of about 150 feet to the south, the 

 several beds being easily identified on either side of it t. 



Conclusions. 



I. The rocks which have been described as a sort of reduplicated 

 Trias (recognizing six divisions) seem to fall into two sejmrate and 



* Cf. Jukes, ' Manual of Geology,' p. 608 ; Geikie, ' Textbook,' p. 751. 



t With reference to the importance here attached to the very brecciated 

 character of this lower series, as compared with the " pebble-beds " of the 

 Bunter, attention may be drawn to the value assigned by Sir Charles Lyell to 

 such evidence. See ' Student's Elements,' p. 381, 3rd ed. 



