GEOLOGY 



Lower 



New Red 



}r 



ermian 



New Red 

 Sandstone 



Series 

 {continued) 



Carboni- 

 ferous 



Upper Culm Measures 

 Middle Culm Measures 

 Lower Culm Measures 



Red rock-sand, brecciated in the upper part and 

 with beds of breccia on the coast, and breccia 

 with sand-rock. Trap rocks of Silverton, 

 Killerton and Poltimore districts 



Breccia with numerous igneous fragments, mur- 

 chisonite, etc, in a loamy sand matrix. North 

 of Crediton valley, gravels and gravelly breccia 

 with few igneous stones. Trap rocks of 

 Dunchideock, Exeter and Crediton districts. 

 Trap rocks of Tiverton (Washfield, etc.) 

 district 



Breccio-conglomerates of Watcombe and Petitor 

 crags, Oddicombe, and Paignton, etc. ; also 

 sands and breccias 



Loamy breccia and clays of Watcombe and 

 Petitor 



Devonian 



Rocks of 



North 



Devon 



Upper Devonian 



Hard, thick, even-bedded, grey grits, intercalated 

 with dark shales 



Irregular and even grits, sandstones and shales, 

 in locally variable association 



Hard shales with limestone bands locally develop- 

 ing into limestones with Posidonomya hecheri 

 and Goniatites spiralis, etc., succeeded by hard 

 shales and chert beds {Radiolaria) based by 

 dense mudstones and dark shales. Contem- 

 poraneous volcanic rocks near the base of the 

 series in Tavistock and Ashton districts : 



Middle Devonian, or Silurian 

 upthrust by faults (Hicks) 



Middle Devonian . . . 



Lower Devonian 



rustica, etc., found 

 un- 



Pilton beds. Argillaceous slates with beds of 

 grit and calcareous fossiliferous lenticles 



Baggy beds. Slates with Lingula, brown sand- 

 stones with CucuUaa 



Pickwell Down beds. Grits of various colours 

 and purple slates 



Morte slates. Greenish and grey slates. Strick- 

 landinia lirata and Orthis 

 by Dr. Hicks ; previously regarded as 

 fossiliferous 



Ilfracombe slates. Silvery and grey slates with 

 limestone bands and lenticles, intercalated 

 with grits toward their base 



Hangman grits. Red quartzose grits with Natica 

 and Myalina in upper part, grits thick and 

 thin bedded variously associated with, or in, 

 slates. (Middle Devonian of Etheridge) 



Lynton beds. Irregular grey, partly calcareous, 

 slates intercalated with thick, even-bedded grits 



Foreland grits. Shaly grits and thick-bedded 

 hard grits associated in places with red slates. 

 (GlengariiF grits of Hull) 



Devonian 



Rocks of 



North 



Devon 



Upper Devonian . 



BufF, greenish and grey slates ; purple-red, green- 

 mottled slates 



In the limestone areas these slates contain 

 calcareous nodules, concretionary limestone 

 and thin, shaly, red-brown limestone, locally 

 with Budesheim Fauna 



rr 



