6 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 24, 



Kcenigi, Am. jlexicostatus, Belemnites tornatilis, all which, however, 

 occur in greater abundance and perfection in the lower zone, which is 

 the chert- deposit. Amongst the Cephalopods are 



Ammonites gemmatus Common. Ammonites lenticularis . Very rare. 



Duncani Common. Arduennensis ? ... Very rare. 



Growerianus Not rare. perarmatus Scarce. 



athleta Not rare. Guhelmi Common. 



lunula . , Scarce. bipartitus Rare. 



Chauvinianus Rare. 



Here it is that the great bulk of the Mollusca and Gasteropoda after- 

 wards enumerated have been obtained. 



At this point Am. GuUelmi is found in tolerable abundance ; but, 

 although Am. Calloviensis is recorded by W. Smith and by Prof. 

 Phillips as having been found here, and, in fact, is mentioned by 

 these authors as one of the fossils which first led to the identification 

 of the rock with the Wiltshire beds, I have nowhere seen a specimen 

 of true Am. Calloviensis from Yorkshire. Prof. Phillips's figure does 

 not agree either with typical Wiltshire specimens, or with the figures 

 of Sowerby or D'Orbigny. 



On the north side of Scarborough Castle, numerous blocks of this 

 rock, derived from section D, but having portions of C attached, for- 

 merly strewed the base, the accumulated debris of centuries from 

 the undermining and falling over of the cliifs adjacent. 



A few years ago the surfaces of these blocks were found to consist 

 of cherty calcareous nodules, filled with fossils, and so diligently have 

 these been explored, that now hardly a block is to be found to reward 

 the industrious collector. 



The Kelloway Eock finally disappears from the cliifs about 

 200 yards north of the Castle. Its upper beds were removed about two 

 years ago in preparing the ground for the erection of a row of houses, 

 and many characteristic fossils were then brought to light, including 

 examples of Am. GuUelmi and Am. gemmatus, of unusual dimen- 

 sions. 



At all the poiuts enumerated, in conformity with a pretty general 

 law, the great deposit of fossils is at or near the top of the bed ; 

 while all below, for a thickness often of 20 feet, is solid, compact 

 sandstone, as at Hackness, where quarries of this rock have yielded 

 the material for the erection of some of our public buildings. 



The Kelloway Eock ranges inland from Gristhorp to Oliver's 

 Mount, where it keeps the lower part of that curious ridge* ; the 

 middle being composed of Oxford Clay : the whole is surmounted by 

 calcareous grit. The eye of the practical agricultural geologist will 

 detect the argillaceous belt of Oxford Clay as he passes on the rail- 

 way along the valley, as well as on the hills on the opposite side. 

 In the parallel valley westward, the KeUoway Eock may be examined 

 in a quarry used for extracting material for repairing roads. Between 

 this point and Hackness I have not observed it ; but the peculiar 



* One or two springs of water mark its junction with the clays of the Corn- 

 brash beneath. 



