Fossil Remains on the Yorkshire Coast. 145 



under the thick diluvial covering. The fault at Ewe Nab has thrown the corn- 

 brash, on its northern side, half-way down to the low water mark, where a small 

 portion is exposed, not observed until recently*. Slight traces of it exist in the 

 cliffs above the Spa at Scarborough, and it appears, for the last time, under the 

 Castle Hill. It may also occur in some of the high cliffs south of Cloughton Wyke, 

 as I have found its fossils amongst the rocks fallen from above. 



The cornbrash seldom averages more than five feet in thickness, consequently 

 few subdivisions can be expected. At Cayton Bay it is about four feet, and reposes 

 on a blue clay varying from three inches to four feet. The following is a general 

 ascending section : 



Blue clay 3 inches to 4: feet. 



Hard ironshot rock 2 feet. 



Softer rock, sometimes ironshot 2 



Fissile oolite, easily decomposed by the atmosphere. , 6 inches. 



At Ewe Nab it is less ironshot. At Cayton Bay the clay yields heads and claws 

 of a small Astacus? enclosed in round argillaceous nodules, and occasionally 

 a rather large bivalve not unlike an Unio, also a small Belemnite, not yet de- 

 scribed. The upper fissile portion of the cornbrash contains chiefly Terehratula 

 ovoides, T. obsoleta, Ostrea edulina and 0. Marshii. The greater number of the 

 fossils however occur towards the middle of the bed. The following are the most 

 abundant : 



Clypeus orbicularis. 

 Mya literata. 

 Amphidesma decurtatum. 



securiforme. 



Cardium citrinoideum. 

 Trigonia clavellata. 



Trigonia costata. 

 Unio peregrinus. 

 Plagiostoma rigidulum. 



interstinctum. 



Ostrea Marshii. 

 Ammonites Herveyi. 



The following species also occur, but less abundantly 



Cidaris vagans, and another species. 

 Clypeus clunicularis. 

 Galerites depressus. 

 Serpula intestinalis. 

 Pholadomya Murchisoni. 



ovalis. 



Mya calceiformis. 

 Cardium dissimile. 

 Isocardia minima. 

 Modiola cuneata. 



Lima rudis. 

 Pecten lens. 

 demissus. 



inaequicostatus. 



Melania vittata, 

 Trochus granulatus. 

 Terebra granulata. 

 Belemnites. 

 Ammonites terebratus. 



* Two years ago I pointed out the necessity of its existence at this spot, when examining the fault 

 and its effects, but from the thick covering of fallen rocks I could not then find it. It contains several 

 new fossils. 



VOL. VI. SECOND SERIES. U 



