ETHEHIDGE DEVONIAN ROCKS AND FOSSILS. 579 



of the Carboniferous Slate. The Coblentzian beds are noticed, with 

 Prof. Jukes's views upon them. 



1865. Pengelly. — " On the Co-relation of the Slates and Lime- 

 stones of Devon and Cornwall with the Old Red Sandstones of Corn- 

 wall " *. This paper refers particularly to the evidence of the fossil 

 fishes in the Devonian strata, and is an endeavour to co-ordinate 

 the Old Eed and Devonian rocks. 



1865. Hall, T. 3/.— "The Geology of North Devon^f. In 

 this lecture on the '^ Geology of the country around Barnstaple, 

 Bideford, Ilfracombe, Lynton, and Clovelly," &c., the author pro- 

 poses a new nomenclature for the North Devonian rocks, which he 

 divides into seven series — " the Foreland Group, Ly7iton Zone, Mar- 

 tinlioe heels, Ilfracombe Group, Marwoocl Zone, and Pilton heds.^^ 

 Whatever local value may be attached to these divisions, they, with 

 his descriptions, clearly express their succession and position below 

 the Carbonaceous series south of Barnstaple. 



1866. Juices. — " On the Carboniferous Slate (or Devonian Rocks) 

 and the Old Red Sandstone of South Ireland and North Devon " J. 

 The Introduction to this paper contains the sum of the differences that 

 exist between Mr. Jukes and the older authors upon the physical 

 structure of North Devon and West Somerset ; and in it he endea- 

 vours to remove from the British rocks the Devonian series, as a 

 system, altogether §. The author gives physical and palaeontological 

 reasons for his conclusions. The second part is devoted to the 

 structure of South Ireland, as derived from his experience in that 

 region ; part the third to the geological structure of North Devon 

 and West Somerset, in which are elaborated the distinctive views 

 held by the author, and the reasons he assigns for his change of 

 nomenclature, and the difference in the conclusions arrived at by 

 him, as compared with those of other writers. 



1867. Jukes. — " Additional Notes on the Grouping of the Rocks 

 of North Devon and West Somerset, mth a Map and Section "||. 

 This pamphlet, so far as regards the subject matter, is intended to 

 supply the deficiency in the author's communication to this Society 

 in 1866, relative to the more complete examination of the series of 

 rocks below the Upper Old Red Sandstone of Pickwell, Devon ; con- 

 sequently the Wiveliscombe, Dulverton, Combe Martin, Dunster, 

 Minehead, and Quantock region are partly described. This paper 

 is accompanied by a map and section of North Devon and West 

 Somerset. 



III. — Steuctuee and Succession of the Rocks of West Somerset. 



1. Cannington Park Limestone. — In the midst of faulted ground 

 the outlier of hmestone at Cannington Park is a conspicuous feature. 



* Royal Geol. Soc. Cornwall, 1865, p. 441. 



t A lecture delivered before the members of the Exeter Naturalists' Club, at 

 ♦' Westward Ho," Northam, Sept. 23rd, 18G5. 



X Quart. Journ. Greol. Soc. vol. xxii. March, 1866. 



§ This view is discussed in my present paper. 



II Printed for private circulation amoni^ the Fellows of the Geological Society 

 of London, 1867. & j 



2r2 



