Bernard Hobson — Permian Breccias of S. Devon Coast. 315 



north side of a scar of conglomerate a similar boulder 3 ft. 6 in. by 

 2 ft. 9 in. by 2 ft. 9 in. ; 120 paces further south two similar blocks, 

 2 ft. 4 in. by 3 ft. by 1 ft. 4 in. and 2 ft. by 2 ft. by 1 ft. 6 in. 

 respectively. I have no doubt that all the loose blocks hitherto- 

 mentioned are derived from the neighbouring Permian conglomerate, 

 as they agree lithologically with the blocks in the conglomerate. 

 Lying, as most of them do, amongst fallen masses of conglomerate, 

 they do not appear to have been appreciably worn by the action of 

 the existing sea. All the quartz-porphyry blocks at Bundle Head 

 and the Ness are subangular. It is on account of their exceptionally 

 large size, and not as average specimens of the blocks composing the- 

 conglomerate, that they are referred to. 



7. Teignmouth. 

 On walking along the promenade (sea-wall) at Teignmouth 

 towards Dawlish, one sees the breccio-conglomerate exposed at the 

 back of the promenade just before it reaches the Great Western 

 Railway. The rock fi'agments in the breccio-conglomerate there are 

 generally 2 to 4 inches across and smaller. Quartz-porphyry is 

 common ; a subangular block of it measured 1 ft. 4 in. by 1 ft. 4 in. 

 by 1 ft. + partially embedded. Purplish-red sandstone fragments 

 are abundant, and the so-called lydian stone occurs. No limestone 

 was observed;' indeed, the difference between the abundance of 

 limestone fragments at the Ness on the south side of the Teign and 

 its comparative scarcity at and north of Teignmouth is such that 

 perhaps one may suspect that the beds on the north of the river are 

 faulted down compared with those at the Ness. 



8. Along the Great Western Bailwaij between Teignmouth and Daiolish, 



North of Teignmouth, at the 208^ mile-post (from London) on the 

 railway, the breccia has an apparent dip of 16° to 20° northward, and 

 consists of distinctly angular fragments, mostly about 3 inches or 

 less, but running up to 7 inches, and exceptionally, in the case 

 of a quartz-porphyry block, 18 inches in diameter. The fragments 

 consist of grey quartzite, greenish quartz - porphyry weathering 

 reddish, the typical red quartz-porphyry, purplish-red sandstone, 

 black quartzite. No limestone was observed, though, as remarked 

 in reference to Teignmouth, a minute search might discover some. 



"Where large boulders occur in these South Devon breccias the}', 

 so far as observed, lie with their longer axes parallel to the bedding- 

 planes - — for instance, at a point 150 paces south of the 208^ mile- 

 post (G.W.R.) a quartz-porphyry boulder 2 ft. 8 in. by 9 in. by 

 1 ft. 4 in. + partially embedded, elliptical in form, moderately well 

 rounded, lies in the breccia 20 to 30 ft. above the rails ; 5 paces 

 north of it is a subangular block of fine-grained mottled red 

 sandstone 2 ft. 4 in. by 1 ft. 6 in. + partially embedded, and about 



^ Very likely a minute search might discover some. 



2 Pengelly says : ' ' The pebbles lie with theu- longest axes parallel to the planes 

 of bedding''' (" The Eed Sandstones, etc., of Deyonshu-e," pt. ii: Ann. Eept. and 

 Trans. Pl)Tnouth Inst., 1862-3, p. 31). 



