132 The Rev, D. Williams's Proofs that the Devonian 



inner zone, during the whole of its circuit. At Bovey Tracey 

 it is concealed for a short distance, the floriferous beds there 

 abutting against the granite ; in many other instances, on the 

 east and south-east of Dartmoor, the floriferous beds are seen 

 in advance of it, and resting on it, and together underlying the 

 killas and coral limestones ; in truth, the entire distance from 

 the west limit of Bovey Heath near Chudleigh to Ivy Bridge and 

 Cornwood, is one continuous series of highly instructive sec- 

 tions for the advocates of the Old Red hypothesis. Thus a 

 traverse from Haytor Rocks to Bickington, gives in ascending 

 succession, granite, Coddon grit, floriferous, coral limestone, 

 killas. 



From Rippon Tor by Owlecombe and AshburtonDown to 

 Ashburton, north and south, the section is granite, Coddon 

 grit, killas, coral limestone with anthracite and culm-shales, 

 killas. 



North of Ashburton, from Summer House by Waterleat 

 and Rewmill, the section is granite, Coddon grit, killas, green- 

 stone, coral limestone, killas. 



From Uppercot by Holne chase to Ashburton, the ascending 

 sequence is granite, Coddon grit, killas. 



From Holne Lee by Holne to Buckfastleigh, the order is 

 granite, Coddon grit, floriferous, killas, coral limestones, 

 killas. 



From Buntingdon Cross by Walliford Down to Dean Prior, 

 the section is granite, Coddon grit, floriferous, killas, coral 

 limestone, killas. 



South of this I have met with no well-exposed section till 

 we come to Bittaford Bridge, two miles east of Ivy Bridge. 

 The Coddon grit here and at Ivy Bridge, appears to contain 

 a somewhat higher per-centage of silica and less of alumina; 

 its ordinary aspect presents a coarse jaspery character; at 

 Bittaford Bridge it differs but little from this ; at Ivy Bridge 

 it is a finer variety, but still a coarse one. If at either Bittaford 

 Bridge or Ivy Bridge it be an altered rock, it is the Coddon 

 grit altered, and 7iot killas, for it strikes with and runs into 

 undoubted Coddon grit on either side of Bittaford Bridge and 

 Ivy Bridge. Weathered specimens show it to possess the 

 same striped, plated and layered character, weathering irre- 

 gularly, the thin and more jaspery plates standing consider- 

 ably in relief of the layers which contain more alumine, and 

 which have been as deeply eroded as the other projects in 

 relief. I do not believe, however, that at either of these places 

 it has been at all altered by the granite, for near a by-lane 

 which leads from Ivy Bridge to Peak-mill, a little south of 

 east, I observed the same rock interpolated among perfectly 



