248 01^ THE EEDS BETWEEN THE UPPER AND LOWER CHALK OF DOVER. 



^ means of these hard beds we can trace the anticlinals and syn- 

 clinals of the Chalk. 



Prof. JuDD congratulated the authors on the great value of the 

 work which they had accomplished, and the new light they had 

 thrown on the succession of the beds of the Chalk. He thought the 

 microscopical work of Mr. Hill of great value. At the Richmond 

 Well the 10 feet of Melbourn Rock was found underlain by the 

 remarkable brecciated bed he had described, which seemed to repre- 

 sent the Belemnite-Marls of the authors. 



Prof. T. Rupert Jones agreed that the beds in the Chalk spoken 

 of as " brecciated " were really such. He remarked on the rock 

 made up of single and apparently primordial chambers of Glohigerina, 

 Planorhulina^ and Teoctularia. Some of these rocks probably con- 

 sisted of 90 per cent, of remains of Poraminifera. 



Dr. HiNDE pointed out the great beauty of the sections exhibited 

 by Mr. Hill ; many of the rocks appeared to be almost completely 

 made up of organisms. 



The President stated that he doubted the existence of false- 

 bedding at Cherry Hinton. He did not think that erosion necessarily 

 implied elevation in the case of the Chalk, because the lowering of. 

 barriers during subsidence might allow stronger currents to act. 



Mr. Hill said that green-coated nodules do not occur in the 

 representative of the Chalk Rock, but the structure of the rocky 

 layers seen in thin sections under the microscope is similar at Dover. 

 The beds which occasionally present a " brecciated" appearance in 

 the zone of Belem.nitella plena more commonly show a structure 

 which he and Mr. Jukes-Browne were led to regard as nodular. 



