1868.] 



JUDD SPEETON CLAY. 



241 



1. The Speeton Clay, including under this name all the beds of clay- 

 exposed in Filey Bay and intermediate between the Hunstanton 

 Limestone and Coralline Oolite, is a deposit of very great thickness 

 and importance. 



2. It is certainly not the equivalent of the Gault; nor does any 

 portion of it appear to be referable to that formation, the evidence on 

 which it was thus originally correlated breaking down on reexami- 

 nation, and being entirely negatived by other and ample evidence, 

 both strati graphical and palaeontological. 



3. The Speeton Clay contains at least seven divisions, well marked 

 lithologically, still better defined palaeontologically. They are : — 

 1st, the Upper Neocomian, having its equivalent in the Lower Green- 

 sand of the south of England ; 2nd, the Middle Neocomian, of which 

 the Tealby series of Lincolnshire is the equivalent ; 3rd, the Lower 

 Neocomian, now recognized for the first time in this country ; 4th, 

 the Portlandian, agreeing much more closely with some of the con- 

 tinental representatives of that formation than with the limestone 

 and sand of Portland ; and, 5th, 6th, and 7th, the Upper, Middle, 

 and Lower Kimmeridge. Some of these groups fall naturally into 

 still smaller subdivisions. 



Appendix A. — Tahle showing the Vertical Distribution of the Fossils of 

 the Speeton Clay. 



Nautilus pseudo-elegans, jD' Orb 



radiatus, Sow 



plicatus, Sow 



Belemnites semicanaliculatus ?, Blainv. .. 



minimus, List 



ultimus, ly Orh 



jaculum, Phill. 



spec, nov.? 



lateralis, PM/ 



sp. 



Trosloyanus, i)' Orh 



nitidus, Bollf. 



Ammonites Deshayesii, Leym. 



, var. curvinodus, Phill. 



Nisus, D' Orb 



nucleus, Phill. 



marginatus, Phill. 



rotula, Sow 



, spec. nov. ? 



, spec, nov 



, spec, nov 



bipinnatus, Will. MS. 



cryptoceras, B' Orb 



angulicostatus, -D' Orb 



crassieostatus, i>' Orb. . . ; 



c3 



ao 



S. V 



t5 O 







be 



^a 



u 



sa 



