156 mr. s. s. buckhan on [June 19 13, 



Leckenby (op. cit. pp. 4, 5) mentions a thin band of calcareous 

 pisolite a short distance to the south of Gristhorpe Bay, which imme- 

 diately underlies the Oxford Clay and is 5 inches thick. He does 

 not seem to have considered this bed of importance, as he does not 

 mention it in his section. But the description seems to fit the 

 matrix of the vertumnus zone : its fairly-large oolitic grains 

 might well be described as small pisolites. Such a bed, therefore, 

 should be placed on the top of his section. In that position Fox- 

 Strangways mentions a hard band very oolitic, and 'very oolitic' is 

 a term which exactly describes the matrix of the gregarium zone. 

 Further, Fox-Strangways says, of the north side of Osgodby Nab : 



' At the top of the rock is a thin band of dark-coloured calcareous shale, with 

 oolitic grains, which also contains many ammonites including a large tubercu- 

 lated species. This is probably the calcareous pisolite ... ' (op. cit. p. 281). 



This description seems to fit the matrix of the gregarium zone. 

 4 A large tuberculated species ' of ammonite is very vague : it 

 might be a Oosmoceras, a Peltoceras, or an Aspidoceras ; certainly 

 Asjyidoceras hirsutum Bayle answers well to the description, and 

 that is a species of the gregarium zone. 



Assuming a general identity of the calcareous pisolite with Fox- 

 Strangways's ' dark-coloured calcareous shale,' then the following 

 suggestion may be made as to the zoning of the sections given by 

 the two authors : — 



Table III. — Zones and Sections op the ' Kelloway Rock ' correlated. 

 Zones. Leckenby. Fox-Strangways. 



' " " ''■■■• I „ , . ... I Hard band, very oolitic. 



Vertumnus I Calcareous pisolite. J 



Lamberti J Soft shaly rock, calcareous. 



oSL;.".'":" } A - Ir0Q y sandstone - \ Soft sandstone. 



(?) B. Sand and sandstone. \ Red irony rock. 



Kanigi C. Irony sandstone. J 



(?) D. Unfossiliferous sandstone. Three beds of sandstone. 



II. Bemaeks on the Fauna and the Zones. 



Beginning at the base : — Leckenby's bed D, which is above the 

 Cornbrash with Macrocephalites (Macroceplialus zone), cannot be 

 assigned to any one zone on the evidence now available. His bed C 

 may be regarded as forming the lecenigi zone. Above that, on the 

 evidence of South of England strata, should be a zone of cattoviense : 

 this may be represented by Leckenby's unfossiliferous bed B ; but 

 it is noticeable that Sigaloceras cattoviense appears to be absent 

 from the Yorkshire strata. There is evidently a lacuna here, for 

 the zone of Reineckeia anceps is also missing. This zone, which is 

 well shown by Continental deposits, would seem to be entirely 

 absent from Yorkshire, and to have been practically removed from 



