330 Norwich Geologieal Society. 



Beds of the Ehastic series were stated to occur at Lea, two miles to 

 the south of Gainsborough, and were described as consisting of more 

 or less indurated and highly micaceous sandstones, alternating with 

 black shaly clays, and containing two bone-beds. 



The fossils are very abundant, and are those which are usually 

 met with in the " Avicula-contorta" zone of other parts of Great 

 Britain. A fragment of the edentulous portion of the right rawMs of 

 the lower jaw of a Pliosaurus was found in the lowest bed, lying 

 on the blue Keuper Marl. Two interesting additions to the verte- 

 brate fauna of this series are Trematosaurus Alberti, and Lepidotus 

 Giebeli ? 



The author pointed out the correlation of these beds with those at 

 Aust Cliff and other well-known localities in England, and their 

 probable connexion with similar deposits in Ireland and on the con- 

 tinent ; he concluded by defining the surface-extent of this the 

 most northern English deposit of Ehsetic age as yet discovered. 



Norwich Geological Society. — ^Monthly Meeting, April 2, 

 1867. The Eev. John Gunn, M.A, F.G.S., President, in the chair. 



A flint implement, picked up that day at Bramerton, by the Eev. 

 J. Gunn, was laid upon the table, and a communication read, stating 

 that another had been found at South Wootton. 



The next subject was introduced by the Eev. S. W. King, M.A., 

 F.G.S., who said that the question as to the proportionate ratio 

 between the existing and extinct species of the Crag was now one 

 of considerable interest, and had been most admirably handled by Sir 

 Charles Lyell and the late Dr. Woodward. One of the most con- 

 spicious, as well as interesting, shells belonging to the Norwich 

 Crag was the Nucula Cohholdice. From a communication lately 

 received from Mr. Gwyn Jeffreys, he learned that Nucula Coh- 

 holdice had been found living in the Japanese seas, near Vancouver's 

 Island. He wrote to Mr. Jeffreys for full particulars, and received a 

 letter from him in which it was stated that the specimens dredged 

 near Vancouver's Island did not differ specifically from Nucula Coh- 

 holdics, and that Mr. Searles Wood confirmed this identification. 

 Now the fact of great interest was the finding of N Cohholdice in 

 Japanese seas, so far removed from England, and yet showing that 

 there must have been a marine connection between the two districts. 

 Leda myalis, too, which he had found under the Boulder-clay, but 

 above the true Crag at West Euncton, had been found living at the 

 mouth of the St. Lawrence. Mr. King showed a specimen of the N. 

 Cohholdice. from Japan with others from the Norwich Crag. The Eev. 

 0. Fisher, M.A., F.G.S., remarked that they had been told by Mr. 

 Taylor that the Upper Crag was a deep-sea deposit ; but it appeared 

 to him the Mtja, Tellina, and Cardium were not deep-sea shells. The 

 Eev. S. W. King said they were littoral shells. Mr. Fisher observed 

 that they were told the assemblage of species showed that the Crag 

 sea had been an area of subsidence, and that important alterations 

 in the fauna had taken place. He scarcely knew what species 

 there were in the bed, proving it to be more northern or arctic 



