124 British Association for the Advancement of Science. 



Mr. De la Beche called the attention of the meeting to the 

 geological map of Cornwall and Devon, which he had made for 

 the Ordnance Survey; it was universally admitted to be a most 

 beautiful specimen of scientific topography. — Mx. J. E. Marshall 

 exhibited a section across the Silurian rocks in Westmorland, 

 from Shap Granite to Casterton Fell. — Rev. D. Williams read a 

 paper on the rocks of South Devon and Cornwall, which was 

 followed by a communication from Mr. Austen on the fossil re- 

 mains of the limestones and slates of South Devon. 



Mr. Lyell announced the discovery, in a crag pit at Newbourn, 

 in Suffolk, of the teeth of several species of mammalia. The 

 first of these fossils was determined by Mr. Owen, to be the pos- 

 terior grinder of the lower jaw of the leopard. Mr. Wood, on 

 receiving this intelligence, examined carefully a large collection 

 of teeth from Newbourn, and they were found to belong chiefly 

 to fishes of the genus Lamna ; but among them was one which 

 Mr. Owen has pronounced to be the molar tooth of a bear, and 

 others which belong to a small ruminant. These fossils are all 

 more or less broken, and there is no doubt they were found in 

 the large pit at Newbourn, in which the teeth of fishes are abund- 

 ant, in red crag. But, Mr. Lyell remarked, that there are many 

 vertical fissures extending downwards to the depth of 30 feet and 

 more, through the red crag at Newbourn ; these fissures being 

 filled with the detritus of shelly red crag. It is possible therefore, 

 that the mammalian teeth may have been derived from the con- 

 tents of these fissures, and may consequently belong to a qualified 

 epoch, posterior to that of the red crag. Mr. L. however, inclines 

 to the opinion that the teeth of the mammalia and fishes will 

 prove of the same age ; because, although the shells of the red 

 crag are almost exclusively marine, yet Mr. Wood has discovered 

 at places distant only a few miles from Newbourn, a fresh-water 

 Amiator, the Planorbis inarginatus, and two individuals of a 

 land shell, Auriada onigosotis, imbedded in the marine crag. 

 The same river, therefore, that conveyed these shells to the sea, 

 may also have carried down the remains of land quadrupeds. 

 Mr. L. then mentioned the discovery of the teeth of an opossum 

 in the London clay at Kyson, near Woodbridge. This fossil 

 was obtained, together with the teeth of fish, from the upper part 

 of a bed of sand about ten feet thick, which is covered by a mass 

 of London clay about 17 feet thick. The clay is again covered, 



