324 



J. P. BLAKE AND W. H. HITDLESTON ON 



c. Cylindrites elongatus, Phil, 

 v. c. Gervillia aviculoides, Sow. 



Avicula ovalis, Phil. 



Astarte Duboisiana, D' Orb. 



Trigonia (clavellate form). 

 c. Sowerbya triangularis, Phil. 



Gresslya peregrina, Phil. 



Myacites recurvus, Phil. 

 . jurassi, Brongn. 



Ehynchonella Thurmanni, Schlot. 

 Waldbeimia Hudlestoni, Walk. 

 Ecbinobrissus scutatus, Lam. 



, sp. 



Millericrinus echinatus, Phil. 

 Rhabdophyllia (fragments). 

 Spongia fioriceps, Phil. 

 Manon, sp. 



The above groups (B. a and 6), having a thickness of 28 feet, con- 

 stitute the Passage-beds of Mr. Pox Strang ways, and will subse- 

 quently be referred to under that title. It follows, therefore, that 

 the oolite of Scarborough Castle Hill (A of fig. 12) is no other 



Fig. 12. — Section of the Upper Part of Scarborough Castle Hill. 



A. Oolite of the Lower 



Limestones, locally 

 known as Coralline 

 Oolite, 24 ft. 



B. a. Gritty and vari- 



able Limestones with 

 shell beds, 17 ft. 

 b. Flaggy, ferruginous 

 Limestones, very 

 gritty ; the 

 beds," 11 ft. 



C. c Ball- ^ 



beds, 

 18 ft. 

 a. An- > ri .. 



«niUr Gnt P r °- 



red 



Lower Cal- 

 careous 



gular 



cherty 



bed. 



per. 



) 



than the lower oolite (d) of the Forge-Valley section ; and this con- 

 clusion is fully warranted by the few fossils it contains. 



To the west of the Derwent Gorge the Lower Limestones may be 

 seen spread out over the surface of the hills, and in quarries in the 



