348 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



[Mar. 7, 



Bed Sandstone of the Barnstaple district continued steady in their 

 strike to the eastwards to at least some miles east of Dulverton. 

 The Carboniferous Slate, however, appeared to me to be getting 

 thinner to the eastward, apparently by reason of the dying away of 

 the sandstones contained in it. That the Marwood Sandstones were 

 still represented was evident from the abundance of subangular 

 blocks and angular fragments of their peculiar kind of stone, in the 

 lanes and ditches and fields along the strike of the lower part of the 

 Carboniferous Slate ; but they did not appear to be quarried, neither 

 did I succeed in finding any fragments containing fossils. In the 

 lanes near a place called Crewsball * in the Ordnance map, a mile 

 west of Dulverton, the rocks shown in the ditches were exactly like 

 those in similar ditches near Marwood. A mile to the east of Dul- 

 verton, too, by the lane-side going over the hill to Burry, there is 

 one little disused quarry in which these sandstones can be partially 

 observed, and they appeared to be perpendicular, striking E. 10° 

 north. The cleavage in all the slate beds about Dulverton strikes 

 about east-north-east and west-south-west, dipping either north or 

 south at high angles. The beds also dip occasionally to the northward, 

 showing that they are either undulated or inverted in places. 



Pig. 10." — Section East of Dulverton. 



Upcot. 



Gulham 



Dulverton Common. 



Length of section about three miles. 



fd"^. Coal-measures. 

 d}. Carboniferous Slate with Marwood Sandstone in 

 lower part. 



/-Mj -o JO ^A^i-^ fRed. yellow, and greenish sandstones interstratified 



c. Old Red Sandstone.. | ^.^^ ^^^^^.^^^ ^^| ^^^^.^j^ ^^^^^^^ 



The sections most interesting to me, however, near Dulverton, 

 were those in the Old Red Sandstone, on the sides of the vaUejs of 

 the rivers Barle and Exe. Just north of Dulverton, in the valley 

 of the Barle, there are large quarries in rocks precisely identical 

 with those seen in so many places in the south-west of Ireland at 

 the top of the Old Red Sandstone. Hard, massive, fine-grained grits 

 of various tints of yellowish white, pinkish red, greenish yellow, and 

 dark-red, and purple, interstratified with bands of green and purple 

 clay-slate, dip south or south- south- east at angles varying from 40° 

 to 70°, with occasional short roUs to the northward. The cleavage 

 sometimes imparts a sort of grain even to the sandstones, at right 

 angles to the bedding. In one mass of bright-red slate, where the 



* No such name as "Crewsball" was known to the people, the place being 

 called "Willway." In like manner "Old HoUom," a neighbouring farm, ought 

 to be "Old Burry." 



