RELATIONS TO OTHER BRITISH DEPOSITS. 51 



Leaving Farringdon we trace the Ironsands southwards to the 

 Ferruginous conglomerate of Calne in Wiltshire with its rare and 

 interesting fossil Eequienia Lonsdalei 1 (Chama, Dicer as). 



A richer fauna was gathered together in 1849 1850 by Mr 

 Cunnington from a road cutting at Sceend 2 near Devizes, where 

 the Kimmeridge Clay was exposed overlain by a pebble bed with 

 Quartz pebbles and fossils, which formed the base of a series of 

 yellowish, dark green, and brown sands and iron sandstones, also 

 containing fossils, "the whole surmounted with a patch of yellow 

 brashy clay of a few acres in extent." This is evidently an exposure 

 of the same series of Neocomian sands and gravels as at Farring- 

 don, and the fossils leave no room for doubt in the matter. 



In the Woodwardian Museum, we find from Sceend : 



Exogyra. Terebratella Fittoni, Meyer. 

 Lima longa, Roener. oblonga, Sby. 



Terebratula Tornasensis, d'Archiac. Rhynchonella depressa, Sby. 

 Terebratella Menardi, Lam. 



and Mr Cunnington also records amongst others, 



Emarginula Neocomiensis, d'Orb. Rhynchonella latissima, Sby. 

 Waldheimia tamarindus, Sby. Gibbsiana, Sby. 



Terebratula sella, Sby. 1 Opis Neocomiensis, d'Orb. 



Other species in the British Museum are, Lima Farringdonensis, 

 Sharpe; various small univalves and bivalves; Sphcerodus Neoco- 

 miensis, and various undetermined Reptile Bones. 



A few miles further south, towards Warminster, these western 

 shore deposits of the Upper Neocomian sea are lost to view, being 

 overlapped by the newer members of the Cretaceous system. 



There can therefore scarcely be a reasonable doubt remaining 

 that these western Neocomian Ironsands and coprolite beds above 

 described are all the result of one and the same physical phenome- 

 non, or continuous (and not greatly protracted) series of pheno- 

 mena; so that for most purposes they should be treated all together 

 as one group. "No one can reasonably doubt the identity of the 

 iron sand and gravels of Devizes, Rowde, and Calne, with those of 

 Farringdon," wrote Mr Godwin Austen, so long ago as June, 1850. 



The many local differences in the several sections are, of course, 



1 According to M. Barrois this is a distinct shell from the Diceras Lonsdalei of 

 the Middle Neocomian of Southern Europe. 



2 Quarterly Journal Geological Society, 1850, page 453. 



42 



