﻿512 



ME. J. T. STOBBS ON THE MARINE BEDS [Aug. I9O5, 



band, scattered through the shale, unaccompanied by any other 

 organisms but fragments of plant- remains. This horizon marks the 

 uppermost limit of the genus Leiopteria and the occurrence of a new 

 form of Pterinopecten. 



Marine Beds near the base of the ' true Coal-Measures/ 



For the purpose of completing the record of the marine bands at 

 present known in the Coal-Measures of North Staffordshire, the 

 following horizons below the Winpenny Coal may be noticed : — 



(10) The Knypersley Marine Band. 



This bed is mentioned by Warington Smyth 1 as being exposed on 

 the eastern side of the reservoir at Knypersley, and containing in 

 abundance Pterinopecten papyraceus. Its horizon is given as being 

 between the Winpenny Coal and the Four-Feet Coal. 



(11) Horizons near the Crabtree, Stinking, or 

 Four-Feet Coal. 



There are three distinct and separate horizons of marine character 

 in connection with this coal-seam. 



The uppermost is recorded by William Molyneux 2 as occurring 

 50 feet above the Stinking Coal of the Churnet Valley, in the form of 

 a thin band of lean ironstone containing remarkably-fine examples 

 of Pterinopecten papyraceus. 



The middle horizon comprises the roof-shale immediately over- 

 lying the Stinking Coal itself, and it was used, many years ago, for 

 the purpose of correlating the Crabtree, the Stinking, and the Four- 

 Feet Coals. The following list has been recorded from this band: — 





GrOLDSITCH. 



Wetley 

 Moor. 



Churnet 

 Valley. 





-X 



-* 



* 



Posidoniella IcBvis (Brown) 



Pterinopecten papyraceus (Sow.) 











The lowest horizon is recorded by Molyneux (loc. cit.) as occurring 

 in a nodular ironstone, found below the Froghall haematite-deposit, 

 and containing Posidoniella and Goniatites. 



1 ' The Iron-Ores of Great Britain' pt. iv, Mem. Geol. Surv. 1862, p. 264. 



2 Eep. Brit. Assoc. 1864 (Bath) p. 343. 



