S-QG Br. Wheelton Hind — Lower Calm of North Devon. 



If the geological map made by Mr. Ussher and published in his 

 paper in the Transactions of the Institute of Mining Engineers 

 (op. supra cit.) be examined, it will be seen that from south to 

 north the Lower Culm beds tend to form a succession of small 

 evanescent synclinals due to folding. Tongues of Middle Culm 

 measures invade the Lower Culm, lying in small troughs which 

 become lost as they pass east. One of these troughs runs up 

 between Hulverton Hill and Westbrook, but in this trough I think 

 I am right in saying no limestones have been found. But at West- 

 brook Farm and near the road from Brush ford to Bampton, beds of 

 Coddon Hill type are to be seen dipping south, to pass beneath the 

 Fosidonomya limestones so fully exposed in the many Bampton 

 quarries. In the railway cutting north of Bampton Station the 

 beds are distinctly thin and cherty, and approach closely to the 

 Coddon Hill type. 



Coddon HhlC 



N 



■ Ordnance 

 K Datum •.."■• -p 



Fig. 2. — Section through Coddon Hill Beds, Barnstaple, on the line A-B in Fig. 1. 

 Scale: horizontal, 4 inches = 3 miles, or 2 inches = 1^ miles; vertical, 

 \ inch = 150 feet. 



At Holcombe-rogus and Westleigh the well-developed limestones 

 all crop out south of the general strike of the Coddon Hill Beds, 

 but the time was too short, in this immediate neighbourhood, to 

 examine the ground in sufficient detail. 



West of Barnstaple an examination of the succession at Fremington 

 seems to point to similar conclusions. The river bank at Fremington 

 shows a series of fossiliferous shales with numerous Brachiopods and 

 corals of a Carboniferous type, but containing no fossils which could 

 be used as an index of horizon. These beds evidently are either at 

 the top of the Pilton series or immediately overlie that series, but 

 for our present purpose it is important to note the relation of the 

 strike of these beds to that of the Pilton series, for they afford 

 a base-line for the determination of the beds immediately above 

 them. These are seen at Pen Hill quarry, immediately south of the 

 railway line, where there are thin platy beds with cherts in bands 

 and siliceous beds, but also there is here a development of calcareous 

 beds of some few feet in thickness. The limestones and shales, 

 liowever, have not been found to contain Fosidonomya Becheri, and 

 the whole section beai's a close lithological resemblance to the 

 Coddon Hill Beds. The beds are dipping south at an angle of 

 28°. At Fremington Pill, near Gaydon's Cottage, thin-bedded 



