220 SPEETON SEKIES IN YORKSHIRE AND LINCOLNSHIRE. [May 1 896, 



Mr. E. S. Hereies congratulated Mr. Lamplugh on his paper 

 and said that from his knowledge of the Author's excellent work at 

 Speeton he felt every confidence in the correctness of his inter- 

 pretation of the Lincolnshire sections. He was especially interested 

 in that part of the paper which dealt with the boundary between 

 the Neocomian and Jurassic, as in this he saw the elements of a 

 reconciliation between the diverse views of Prof. Judd and the 

 Author. He wished to say how much assistance he had derived 

 from Prof. Judd's paper while working on the Speeton section. 



Mr. G. C. Crick desired to bear testimony to the value of the 

 paper. So far as the beds in question were concerned, he agreed 

 with the Author in using the belemnites to characterize the various 

 zones. He mentioned that much of the confusion which had arisen 

 with respect to the determination of some ammonites, such as 

 Ammonites biplece, was due to the unsatisfactory conditions of the 

 types, some of these having been obtained from the Drift. 



Mr. W. H. Htjdleston also spoke. 



The Author was glad to learn that Prof. Judd was inclined 

 in the main to accept his results. As for the belemnites, their 

 peculiar value as zonal fossils in the area described was, not only 

 that they were abundant, but that owing to the intervention of the 

 southern forms of the jaculum-giouip between the lateralis- and the 

 brunsvicensis-grou^s of the northern eocplanati, the boundaries were 

 very definite and easy to trace. He was quite ready to grant to 

 Mr. Strahan and Mr. Woodward that an unconformity might exist at 

 the base of the Spilsby Sandstone, and even that true pebbles might 

 exist at this horizon, though he had himself failed to find any. His 

 contention was, however, that the phosphatized casts of fossils were 

 not derivative as had been supposed, but represented a fauna proper 

 to the horizon and to some extent distinct from that of the overlying 

 portion of the Sandstone. The condition of the casts appeared to be 

 similar to that of the nodules dredged up by the Challenger ex- 

 pedition. He allowed that such nodules might form pebbles upon 

 the destruction of their original matrix, but held that this explana- 

 tion should be adopted only when the evidence was convincing, and 

 not in such cases as this, where (as he had tried to show) it was 

 insufficient. He thanked the Society for the kindly reception- 

 accorded to his paper. 



