156 E. 0. Martin— Ni'20 Red Gravels of the Tiverton District. 



gravels occiipy the higher grounds (400 to 850 feet) and are replaced 

 by breccias in the lower grounds. Fossiliferous fragments occur, but 

 are not so common as further north. They have been detected 

 at Christ Cross, near Silverton (847 feet), and in the lane sections 

 north-west of Bradninch. The species found included : — 



Spirifer VeriieiiiH, Murch. TentacitUlcs conicus, F. A. Roraer. 



Rhynchonella Partridgice, Whidb. Crinoid remains. 



A fragment of grit with Spirifer Verneuili was found in the section 

 by the Tiverton-Exeter Road, south of Jenny's Portion. 



The last patch of gravel mantles the slopes of the large Culm inlier 

 at White Down Copse, in the parish of Broad Clyst; and here, 15 

 miles in a straight line from the outcrop of the Pilton Beds, fragments 

 of grit with Pilton fossils occur. They were found in the lane 

 section east of Frogmore, and in another section still further to the 

 east. The species found included Rhynclxonella Partridgice, Whidb., 

 Ctenodonta lirata, Phil., sp., and Crinoids. 



5. Thorveeton District. 



The following note appears in the Geological Memoir of the Exeter 

 District (p. 7) : — " South of Cadbury, between the streamlets near 

 Kidlake (West Bowley on the old series map), amongst numerous 

 fragments of brown grit scattered over the surface one containing 

 casts resembling Stropfiomena was picked up. The stones, although 

 unworn, may be mixed with debris resulting from the denudation of 

 lower New Red rocks." 



Fragments with Upper Devonian fossils are fairly common in the 

 road sections and ploughed fields north of Thorverton. 'J'hey contain 

 the usual fossils, Spirifer Verneuili^ Murch., and Rhynchonella 

 Partridgi<B, W^hidb., being the most common. Further west, between 

 Thorverton and Crediton, the gravels are replaced by breccias composed 

 largely of trap. No fossiliferous pieces have been detected in this 

 direction. 



Summary and Conclusions. 



The New Red gravels of the Tiverton type extend from Warbrights- 

 leigh and Chimney Down on the north to Thorverton and White 

 Down Copse on the south. Further south they are replaced by 

 breccias and sandstones or covered by the higher beds of the New 

 Red series. Throughout the whole of this area of nearly 1 00 square 

 miles the gravels contain fragments of sandstone and grit with Upper 

 Devonian fossils. These Devonian fragments are most common in 

 the north-east of the district, and are comparatively rare further 

 south. They are found at the entrance of the Crediton valley, but 

 do not appear to be present further west. 



All the fossils that have been identified are known to occur in the 

 Pilton and Marwood Beds of North Devon. The only Trilobite found 

 {Phacops latifrons, Bronn) is practically the only Trilobite occurring 

 in the Pilton Beds, where it is very common. Spirifer Verneuili, 

 Murch., Spirifer JJrii, Ylc-ai., Rhynchonella [Cainarotoechia) Partridgim, 

 Whidb., and Productm prailongtis, Sowerby, are the commonest 

 Brachiopods both in the gravels and in the Pilton Beds. The little 



