302 THE CANADIAN NATURALIST. [Sept. 



fossils were found in them. Mr. Pengelly said he had found 

 300 specimens of Pteraspidian fishes in the Devonian rocks, as 

 well as Cephalopoda. Mr. Edward Hull, F.R.S., expressed his 

 hope that geologists would withhold their decision on Mr. 

 Godwin-Austen's separation of the Old Red Sandstone and 

 Devonian, and pointed out the three subdivisions of these 

 formations in various places. He thought the evidence of fossil 

 fish was not sufficient to establish the fresh-water origin of the 

 Old Red Sandstone. 



THE GRANITE OP THE NORTHERNLY AND EASTERNLY SIDES OF 

 DARTMOOR, BY G. W. ORMEROD, F.R.S., &C. 



This short paper was intended to serve as a guide to 

 geologists visiting Dartmoor. Schorl and tourmaline are of 

 frequent occurrence in the granites. South of Torquay are rock 

 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 contour of the country may be attributed to this 

 phenomenon. It was an uncertain point whether the Dartmoor 

 granite was all of one age, but the " el vans," 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 the granite 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. 



SOURCE OF THE MIOCENE CLAYS OF BOVEY TRACEY. 



W. Pengelly, F.R.S., F.G.S., read a few notes on the above 

 subject. All the beds of clay and sand at Bovey thin out towards 

 Dartmoor. Most of these were formed of disintegrated granite. 

 The clays are interstratified with the lignite, or coal beds, and 

 the author thought that Mr. Maw and himself had referred to 

 two different beds. 



