Vol. 69.] 



THE ' KELLOWAY ROCK OF SCARBOROUGH. 



153 



From the examination of these specimens it is possible (1) to say 

 what the ammonite fauna is ; (2) to arrange the ammonites in 

 groups, according to the different matrices which the}' exhibit ; and 

 (3) to make a supposition as to the relative order of the different 

 matrices. The results arrived at may be stated as follows, beginning 

 with the bed which underlies the so-called ' Oxford Clay ' of York- 

 shire, according to the statements in the literature. 



Table I. 



-Matrices and Ammonite Fauna of the ' Kelloway Rock' 

 of Scarborough. 



Gregarium zone. 



Bluish, calcareous, with many close-packed oolitic grains which are 

 fairly large. 



Quenstedtoccras gregarium Bean- 

 Leckenby sp. 

 Q. turgidum Bean sp. 

 Aspidoceras Mrsutum Bayle. 



Lunuloceras conterminum Bean- 



Leckenby sp. 

 L. cf. pompeckji Parona & Bonarelli. 

 Oppelia sp. 



Vertumnus zone. 



Grey, with a few fairly-large oolitic grains. 



vertumnus Bean- Siemiradzkiapoculwn Bean-Leckenby 

 sp. 



Leckenby sp. 

 Q. aff. vertumnus. 

 Vachyceras rugosum Bean-Leckenby 



sp. 

 Oppelia glabella Bean-Leckenby sp. 



S. plana (?) Siemiradzki sp. 

 Hectieoceras ombilicatum Tsytovitch. 

 H. puteale Bean-Leckenby sp. 



Perisphiuctes alligatus Bean-Leckenby sp. 



This has a bluish matrix, with occasional fairly-large oolitic grains ; but 

 there is not much matrix attached. 



Bluish, marly, calcareous, with a few oolitic grains. 



Aspidoceras faustum Bayle sp. Q. aff. gregarium Bean-Leckenby 



Qaenstedtoceras vertumnus Bean- sp. 



Leckenby sp. 



Lamberti zone. 



Bluish, somewhat argillaceous, a few large grains. 



Quenstedtoceras lamberti J. Sowerby sp. 

 Q. flexicostatum Phillips sp. 



k2 



