Vol. 69.] THE ' KELL0WAY ROCK ' OF SCARBOROUGH. 157 



the Callovian strata of the rest of England : the only evidence for 

 it known to me being a solitary Reineckeia from Wiltshire, and 

 another reported by Dr. A. Morley Davies from Dorset. Such 

 isolated finds appear to indicate that the zone was denuded 

 except, perhaps, for a fragment or two left in pockets. But in 

 Scotland at Duart House, in the Isle of Mull, the Reineckeia- 

 anceps zone is represented by several species and many specimens; 

 the material was submitted to me for professional work by the 

 Geological Survey of Scotland. 



Another Continental zone, that of Ammonites coronatus (Erym- 

 noceras coronatum Bruguiere sp.), occurs about this horizon, above 

 anceps. It also must have suffered by denudation. There appears 

 to be no trace of Erymnoceras in Yorkshire. In Wiltshire there 

 is a representative, E. reyinaldi Morris sp. : this appears to have 

 been not uncommon, and is quoted from a rock-band about 10 feet 

 above ' Ammonites jason.' l From the brickyard, Calvert Station 

 (Buckinghamshire), I have the same species ; this exposure shows 

 about 90 feet in the so-called ' ornatum zone.' In the ornatum 

 zone of Oxford the species or its allies appear to be wanting ; 

 perhaps these strata represent only the upper part of the Calvert 

 series. 



The ornatum zone in the Kelloway Bock of Yorkshire is repre- 

 sented by a stratum with coarse oolitic grains, yielding several 

 species of Cosmoceras, Other species of the genus show a more 

 iron-stained matrix, which is similar to that yielding many species 

 of Peltoceras (atlileta zone) ; but perhaps the iron-staining of the 

 Cosmocerata is deceptive, being 'due to filtration from a superior 

 stratum. These Cosmocerata are remarkable for their large size, 

 and in some cases for their robust proportions ; they are unlike the 

 usual ornatum-zone series found in the Midlands. And the series 

 of Peltoceras is more varied than in the Midlands : P. reversum is 

 a very noticeable form, quite suggestive of P. transversarium 

 Quenstedt sp. and P. toucasianum d'Orbigny sp., which are from 

 the Argovian. 



On the evidence of Fox-Strangways's section, where calcareous 

 shaly rock follows above soft sandstone resting on the irony bed, 

 the zone of lamberti is next in order above that of athleta, for the 

 matrix of the species examined and placed in this zone is the only 

 one which seems to correspond with his description. Apparently, 

 however, there is much difference in the lamberti zone of Yorkshire, 

 as compared with that of counties south of the Humber ; the former 

 is much less fossiliferous than the latter. 



Above the lamberti zone comes the renggeri zone, well developed 

 in Buckinghamshire and on the Continent, and very fossiliferous. I 

 have seen no evidence for this zone among the Yorkshire specimens 



1 E. N. Mantell, ' Strata . . . exposed . . . near Chippenham, &c. ' Q. J. G. S. 

 vol. vi (1850) p. 313 ; Ammonites reyinaldi is figured in pi. xxx, fig. 6. 



