Geological Society of London. 87 



In the paper a full description of the representatives of the 

 Birkhill, Gala (Tarannon), and Wenlock beds is given, and the 

 distribution of the fossils (chiefly graptolites) in the various sub- 

 divisions is recorded. Many of the graptolites are forms which 

 have been described from Swedish deposits, but have hitherto been 

 unrecorded in this country. 



3. " The Gypsum Deposits of Nottinghamshire and Derbyshire." 

 By A. T. Metcalfe, Esq., F.G.S. 



The gypsum deposits of these counties occur in the Upper Marls 

 of the Keuper division of the Triassic system. The Author describes 

 their occurrence in thick nodular irregular beds, large spheroidal 

 masses, and lenticular intercalations, and their association with 

 satin-spar, alabaster, selenite, and anhydrite. 



lI._January 22nd, 1896. -Dr. Henry Woodward, F.R.S., Presi- 

 dent, in the Chair. The following communications were read : — 



1. " On the Speeton Series in Yorkshire and Lincolnshire." By 

 G. W. Lamplugh, Esq., F.G.S. 



Further work on the Speeton section, while extending our know- 

 ledge of the palaaontological details, has fully sustained the results 

 of the Author's previous investigations. The rapid attenuation and 

 final disappearance of the Speeton Series in a westerly direction in 

 Yorkshire is discussed, and though the available evidence is held to 

 be insufficient to demonstrate the exact conditions, it is shown that, 

 contrary to the accepted view, the lower zones are probably the first 

 to die out, and are overstepped or overlapped by the higher divisions, 

 since at Knapton, fourteen miles inland, only the upper zones of the 

 coast-section can be proved to occur, as shown by the presence of 

 marls with Bel. minimus passing upward into the Bed Chalk, aiid by 

 the fossils preserved in the Old Collection which include Ifoplites 

 Deshayesii under the name of Amm. Knaptonensis, Bean MS., and 

 a few others. 



The ferruginous sands locally occurring beneath the Red Chalk on 

 the western edge of the Yorkshire Wolds are recognized as agreeing 

 in all respects with the Lincolnshire Carstone ; and Mr. A. Strahan's 

 conclusions as to the relations of this division to the Red Chalk are 

 confirmed both in Yorkshire and in Lincolnshire. 



In Mid-Lincolnshire all the palreontological zones of Speeton are 

 identified and traced, the presence of the leading zonal types of the 

 Cephalopoda readily establishing the general correlation proposed 

 by Professor A. Pavlow and the Author, in spite of the greatly 

 modified lithological aspect of the deposits, and the corresponding 

 modification of their fauna. The chief features of this correlation, 

 which differs in many respects from that adopted by Professor Judd 

 and the Geological Survey, are as follows : — (see table on p. 88). 



Kimmeridge Clay. 

 In Lincolnshire in at least one instance the boundary of a palseon- 

 tological zone, which is the true synchronal line, is shown not to 

 pursue the same stratigraphical horizon throughout its course, 



