448 Geological Society. 



lower part of a fissure is filled with a brown marl containing 

 crystals of carbonate of lime and numerous remains of Arvicolce, 

 Frogs, Birds, and Pishes. The jaws of Arvicola were very abundant. 



He then proceeded to describe the occurrence of similar phe- 

 nomena in the Bristol area, as at Durdham and Clifton Downs, in 

 the gorge of the Avon at Clifton, at Ashton and Westbury-on-Trym, 

 in the Yate rock, in Nettlebury quarry, at Clevedon, and on the 

 Thornbury railway. He noticed the occurrence in the infillings of 

 fissures traversing* the Carboniferous Limestone of these localities of 

 fossil remains belonging to various geological ages ; and he especially 

 called attention to the presence in different deposits of an immense 

 number of small tubular bodies of doubtful origin, for which, should 

 they prove to be of organic nature, he proposed the name of Tubu- 

 lella ambigua. By different authorities these little bodies have 

 been assimilated to Serpuhe (Fihgrana), insect-tubes, and the casts 

 of the fine roots of plants. With regard to the age of the fissure- 

 deposits, the author remarked that although in some fissures the 

 infilling shows a mixture of organisms, in most cases each " vein " 

 appears to have an individuality of its own, and thus the veins 

 represent intervals of geological time clearly distinct from one 

 another, different fissures showing infillings of Alluvium, Oolite, 

 Lias, Rhaetic, and Keuper beds. The presence of his Tubuhlla he 

 considered to indicate freshwater conditions. 



The author also referred to the discovery of Thecodontosaurus and 

 Palceosaurus many years ago at the edge of Durdham Down, and 

 discussed the age of the deposit containing them, which was 

 originally supposed to be Permian, and was referred by Mr. 

 Etheridge to the Dolomitic Conglomerate at the base of the Keuper. 

 The author stated that he had found remains of the same genera in 

 Rhaetic deposits at Holwell and Clifton Down, and had hence been 

 led to refer the two genera to that age. He stated, however, that 

 he had since discovered teeth of Thecodontosaurus identical with 

 those of the Bristol area in a deposit belonging to the middle of the 

 Upper Keuper at Ruishton near Taunton, and recognized certain 

 differences between these teeth and those of the same genus from 

 the Rhaetic beds of Holwell ; hence he was led to give up the 

 notion that the former were of Rhaetic age, and to refer them to the 

 Upper Keuper ; but he remarked upon the interesting fact that, 

 while most of the generic forms of the Keuper are represented in 

 the Rhaetic, the species differ. 



2. " Interglacial Deposits of West Cumberland and North Lan- 

 cashire." By J. D. Kendall, Esq., C.E., E.G.S. 



The glacial deposits of the district consist of an Upper and a 

 Lower Boulder-clay, with an intercalated group of sand, gravel, and 

 clay, the three being rarely present in one section. These deposits 

 occur fairly continuously up to 500 feet above the sea, and in 

 patches up to 1000 feet. Associated with these glacial beds are 

 deposits of vegetable matter, which, when occurring on the sea- 

 shore, have been designated submerged forests. The author con- 

 siders this designation incorrect. The results of a large number of 



