64 RELATIONS TO OTHER BRITISH DEPOSITS. 



Atherfield clay period; but we do find a very close relationship 

 between these beds and the Sandgate and Hythe series as developed 

 in Kent and Surrey, and it is to this part of the Lower Cretaceous 

 series that I consider they belong. The phosphatic nodule beds 

 are especially similar to the pebble bed of Mr Meyer as developed 

 both in the east and west of the Weald area. 



In proceeding to trace the relations of our Neocomians to those 

 of the northern areas we find their connexions seriously broken at 

 the two sea gulfs of the Wash and Humber ; for these places just 

 coincide with points of radical changes in the rock beds. The 

 general characters of the rocks are so widely different on opposite 

 sides of these two barriers that the detailed relations of the several 

 types to one another are far from obvious. North of the Humber 

 we have the Speetonian type, consisting of one great mass of stiff 

 clay. Between the Humber and the Wash is the Tealby type of 

 Neocomian consisting of 



(3) Upper sand group, 



(2) Middle series of limestones, ironstones and clays 

 = Tealby series (Judd), 



(1) Lower sand group, 



which Professor Judd has shewn to be the equivalents of the Upper, 

 Middle, and Lower Speetonian (Neocomian) respectively. But the 

 relations of these beds to the Ironsand and Carstone series over the 

 other side of the Wash have yet to be determined. 



Scarcely any fossils were known from the lower sands of Tealby 

 at the time when Mr Judd's papers 1 on the Lincolnshire Neoco- 

 mians were written; but in the summer of 1875 when working in 

 Lincolnshire with my father, we were fortunate enough to find a 

 number of beautiful fossils, mostly from hardened sandstone masses 

 in the neighbourhood of Donnington and Claxby. These include : 



Ammonites Kcenigi, Shy. Ammonites multiplicatus, Roem. 1 



mutabilis, Sby. plicomphalus, Sby. 



Species of 



Chemnitzia. Pileopsis and Viatica. 



PJiasianeUa. Inoceramus. 



Pleurotomaria, Pholadomya. 



Trochus. Thetis. 



Crepidula. Lucina. 



1 Geological Soc. Proceedings, August, 1867. 



