222 BRITISH ASSOCIATION, &C. 



Old Ked Sandstone group was a very perplexing one, and passed down into 

 the Silurians at its base, and into the Carboniferous towards its upper 

 portion. The most northern portion of Devonshire where rocks containing 

 true Devonian fossils came up was Linton. The author then traced the 

 easterly direction of the Devonian group, showing how they cropped up 

 beyond the chalk of Boulogne, and thence across Belgium and Prussia, into 

 Bohemia and Eussia. — Professor Phillips said the division of Old Bed Sand- 

 stone as fresh-water, and Devonian as marine, made by Mr. Godwin- Austen, 

 was very distinct. The former extended towards the north, and the latter 

 towards the south. He expressed himself however, as opposed to the fresh- 

 water origin of Bed Sandstones, simply because few fossils were found in 

 them. — Mr. Pengelly said he had found 300 specimens of Ptcraspidian fishes 

 in the Devonian rocks, as well as Cej^halopocla. — Mr. Edwaed Hull, F.E.S., 

 expressed his hope that geologists would withhold their decision on Mr. 

 Godwin-Austen's separation of the Old Bed Sandstone and Devonian, and 

 pointed out the three sub-divisions of these formations in various places. 

 He thought the evidence of fossil fish was not sufficient to establish the fresh- 

 water origin of Old Bed Sandstone. 



The Gkanite op the Noktheenly and Easteenly Sides of Daetmook. — 

 By G. W. OiiMEEOD, F.E.S., &c. 



This paper was intended to serve as a guide to geologists visiting Dart- 

 moor. Schorl and tourmaline are of frequent occurrence in the granites. 

 South of Torquay are rook basins, of various shapes and sizes. Throughout 

 the whole of Dartmoor the granite is much jointed, and sudden changes in 

 the joints and stratification frequently occur. On the north of Dartmoor,- 

 near Belston, the granite bends under schistose rocks, and the present con- 

 tour of the country may be attributed to this phenomenon. It was an un- 

 certain point whether the Dartmoor granite was all of one age, but the 

 " elvans," or veins crossing the mass, were of undoubtedly later age. A vein 

 of fine porphyry may be seen on the road from Okehampton to Exeter. Mr. 

 Ormerod said geologists visiting Dartmoor could not help asking what had 

 become of the overlying rock masses, and what had been the agents which 

 had cut it down to its present form. Mr. Pengelly had stated that some of 

 the beds in the Isle of Wight had been formed out of the wear and tear of 

 the granites of Dartmoor. The author had not found any glacial scratchings, 

 but last year professor Otto Jorell had visited with him the gravels near 

 Hunt's Tor, and that geologist had declared it as his firm opinion that these 

 were remains of moraines. 



Teeea Cotta Clay at Watcombe, Toeqday. — Me. E. Etheeidge. 



The author of this Paper described the discovery, some years ago, in 

 boring, of a large deposit of Terra Cotta Clay at Watcombe, resting on New 

 Bed Sandstone. This clay was mineralogically similar to that formerly used 



