598 ON THE UPPER CRETACEOUS I]S T WEST SUEEOLK AND NORFOLK. 



by Mr. Reid at West Dereham, the greater part were phosphatized, 

 and might have been derived ; but the few which evidently belonged 

 to the bed were thought to indicate Chalk-marl rather than Gault. 

 Fragments of large Inocerami were such as occur in the Chalk. 

 The correlation, by the Authors, of the Hunstanton Red Chalk with 

 the Gault, if proved, was of great interest. 



Dr. Hende also spoke in verification of the Authors' work. 



Mr. Hudleston regretted the length of time which had elapsed 

 since he had entertained any of these questions, but the paper was 

 calculated to arouse the old interest. He had always thought that 

 the fossil contents of the Hunstanton red rock pointed most clearly 

 to its being, in the main, on the horizon of the Upper Gault. These 

 were, in the main, Mr. Wiltshire's original views, and the objections 

 arising from lithological differences had been surmounted years ago. 

 Consequently it was with the utmost surprise that he had read from 

 time to time the several interpretations which had been put forth. 

 In the present paper it would seem that the Authors claimed that 

 the Hunstanton red rock represented the whole of the Gault. Cer- 

 tainly the occurrence of Amm. interruptus in the chalky Gault a 

 very few miles south of Hunstanton was in favour of this view, but 

 he should like to know of its occurrence at Hunstanton. The attenu- 

 ation of the various beds so carefully traced out by the Authors, 

 besides tending to throw much light on the basal Upper Cretaceous 

 in Lincolnshire, would ultimately explain what had hitherto been 

 regarded as an anomaly in the Chalk of Yorkshire. 



He. Teall had not studied the subject since he wrote his essay 

 on the Potton and Wicken phosphatic deposits. He was pleased to 

 find that there was good reason to believe that he had not made a 

 mistake in recording the occurrence of Gault in West Dereham. The 

 section was well exposed when he examined it, and he satisfied 

 himself that the phosphatic nodules were, to some extent, at least, 

 indigenous to the deposit in which they were found. 



Mr. Jukes -Browne, in reply, alluded to the differences of opinion 

 expressed by his colleagues on the Survey, and, as Mr. Newton had 

 said, they had not yet met with a view to coming to an agreement, 

 but he believed that it would be found that the work done in 

 Norfolk would have much bearing upon the interpretation in 

 Lincolnshire and Yorkshire. Mr. Reid had given up his reliance 

 on the stratigraph} T . The presence of Amm. interruptus in the 

 base of the Marl at West Dereham was a fact that could not be got 

 over. The presence of a nodule-bed did not necessitate any great 

 break in the sequence ; it merely represented the residual washings 

 of a certain amount of sediment. Their paper was a confirmation of 

 Mr. Wiltshire's conclusions, and that author had himself heard of a 

 red bed overlain by grey clay near Flitcham. The Hunstanton 

 specimen of Amm. interruptus ought to be in the Woodwardian 

 Museum. He would remark that Amm. rostratus was not confined 

 to the Upper Gault, but was common in the Lower Gault of Bucking- 

 hamshire, where there was a mixture of Upper and Lower Gault 

 forms of Ammonites. 



