OP THE MEUX-WELL DEPOSITS, 923 



Mr. Haeeison pointed out the correspondence of the specimens from 

 the Crossness boring with the typical Trias of the Midland district. 



Mr. Evans referred to the undulations of the strata of the N.W. 

 of Prance, as pointed out by M. Hebert, and to the parallelism of 

 the river-valleys of that district, which corresponded in direction 

 with the Bethune and Marquise coal-fields, and also with the general 

 strike of the North Downs. He argued that these undulations were 

 prolonged into England, even to the neighbourhood of London, but 

 feared that the deposits covered such small areas as to give little hope 

 of obtaining successful results from trial-borings. 



Prof. Pkestwich, in reply, said that he thought that the thin- 

 ness of the Neocomian at Meux's well was due partly to the ori- 

 ginal smallness of the deposit and partly to denudation. He remarked 

 on the abundance of carbonate of lime in the beds. He considered 

 the beds at Kentish Town and Crossness to be Old Red Sandstone, 

 from their agreement with the equivalent beds in the neighbourhood 

 of Prome. He found that Rhynchonella hottensis occurred in Meux's 

 boring, proving the beds to be Upper Devonian. He had watched 

 the boring at Kentish Town very carefully, and did not think that 

 any beds intervened between the Gault and the red micaceous sand- 

 stone and grits. The fossils found appeared, as at Crossness, to be 

 all derived from above, as was determined at the time by both the 

 late Mr. Sharpe and himself. 



