Yol. 52.] ASSOCIATED BEDS, IN N. DEVON AND W. 80MERSET. 257 



II. MORTHOE AND WoOLACOMBE TO BlTTADON. 



The beds are well exposed at Morte Point and in the cliffs of 

 Rockham Bay on the northern side, and between the Point and 

 Woolacombe on the southern side. At the Point the beds are nearly 

 vertical, being folded so acutely that the bedding, owing to the 

 cleavage, is with difficulty made out. Under Morthoe, however, there 

 are some well-marked folds, and the strike is shown to be from about 

 "W.S.W. to E.N.E. The folds are here, as in most places along this 



November 1867, and is given in reply to the papers in the Quart. Journ. 

 Geol. Soc. of that year by Mr. Townshend Hall and Mr. Etheridge. 



Southern Area. Northern Area. 



0. Pilton and Barnstaple Beds. 

 4. Braunton Beds. 



3. Croyde Beds. 



2. Ba?gy and Mar wood Slates. 



1. Pickwell Down Sandstones (red). 



5. Grey unfossiliferous slate. (Morte.) 



4. Calcareous Slates. (Ilfracombe.) 



3. Hangman Grits. 



2. Lynton Slates. 



1. Lynton Sandstone (red). 



Prof. Jukes places the beds, as named by Mr. Etheridge, in parallel columns, 

 with the view of showing that the groups in the one area are merely a repetition 

 of those in the other. 



Since that time the rocks have been investigated by Messrs. Valpy, Hall, 

 Champernowne, Ussher, and others ; but no important change in the classifica- 

 tion suggested by Mr. Townshend Hall and Mr. Etheridge has been attempted 

 by them. In a paper 011 the ' History of the Classification and Nomenclature 

 of the North Devon Rocks/ in the Trans. Devonshire Assoc. 1879, p. 189, 

 Mr. Townshend Hall says : ' On the whole, as far as North Devon proper is 

 concerned, I believe the following classification is the best that can be adopted 

 for the Devonian beds : — 



j j f Pilton Beds. 



Devonian 1 Oacuilaa-zone (Baggy Point, etc.). 

 Devonian. ^ pickwell Down Sandstone# 



,,. -, -.j r Morthoe Slates. 

 j. . < Ilfracombe Slates and Limestones. 

 [ Martinhoe or Hangman Grits. 

 Lower ( Lynton Beds. 

 Devonian. \ Foreland Sandstones.' 



And at p. 190, he says: — 'It will be found that the North Devon Beds from 

 Lynton to Pilton, though possessing a general dip to the south, are folded into 

 many anticlinals, reducing their apparent thickness very considerably. I know 

 this to be the case at so many different places throughout the area that, until 

 we have a re-survey on the six-inch scale, I fear it will be a hopeless task to 

 attempt to map the exact boundaries of the subdivisions, or to estimate their 

 real thickness.' 



In Sir H. De la Beche's ' Report on the Geology of Cornwall, Devon, and 

 West Somerset,' 1839, a section across the North Devon Beds is given (fig. 1, 

 pi. iii.) which shows several main folds ; and Dr. Sorby. in his well-known paper 

 'On the Origin of Slaty Cleavage' (Edinb. New Phil. Journ. vol. lv. 1853, 

 p. 137), and Mr. J. E. Marr, in his important paper ' On some Effects of 

 Pressure on the Devonian Sedimentary Rocks of North Devon ' (Geol. Mag. 

 1888, p. 218), have shown how the rocks in places have been greatly affected 

 and minutely folded and broken by pressure. See also Jukes, Quart. Journ. 

 Geol. Soc. vol. xxii. (1866) p. 371 ; Champernowne, Geol. Mag. 1878. p. 193; 

 Champernowne & Usher, Quart. Journ. Geol. Soc. vol. xxxv. (1879) p. 532 

 and Hicks, Geol. Mag. 1893, p. 3.— April 15th, 1896.] 



