Fossil Remains on the Yorkshire Coast. ^33 



entire length of the bone when perfect is uncertain, but it appears to have 

 been of gigantic size. 



The only portion of a vertebra is a fragment 4-j^ inches long by 2i inches 

 in diameter. 



It is very possible that these remains may belong to the Megalosaurus ; 

 and if this should prove to be the case, we shall have in the superior beds of 

 the great oolite of Yorkshire, some of the interesting fossils of the Stones- 

 field slate 



(e.) The seam of clay, above the ironstone, contains Amphidesma decur- 

 tatum with fragments of Avicula Braamburiensis, and of a Gervilia. 



(/.) The next bed, consists of nodular ironstones, separated by alternating 

 seams of argillaceous oolite, each layer being generally about eight inches 

 thick. In the lower argillaceous seams at Cloughton Wyke, Perna quadrala 

 occurs rather abundantly, and in the upper are the following fossils : 



Melania Heddingtonensis. 

 Terebratula spinosa. 

 Gryphea nani. 

 Ostrea Marshii. 

 Pecten lens. 



Plagiostoma interstinctum. 

 Avicula Braamburiensis. 

 echinata ? 



Gervillia acuta. 

 Trigonia costata. 



clavellata. 



Astarte minima. 

 Corbula depressa. 

 Pinna cuneata. 

 Pentacrinus vulgaris. 

 Cidaris vagans. 



The most abundant of these are Avicula Braambitrienais, with the species resembling A. echinata, 

 Plagiostoma interstinctum, Gervillia acuta, and Astarte minima. Of Trigonia clavellata, I have 

 found a single specimen, at the junction of one of the lower argillaceous seams, with a layer of 

 ironstone. It agrees with the fossil found in the Cornbrash. The Cidaris vagans is rare, and not 

 being larger than a shilling, can have no connexion with the long tubercular spines before men- 

 tioned ; but the smaller spines which I shall have occasion to mention, may belong to it. 



In the hard beds of ironstone, Ammonites Blagdcni sometimes occurs, but more rarely than in the 

 bed(i. 



I will now describe the upper part of the Bath oolite, at two other locali- 

 ties on the same range, and not more than three miles from White Nab. 

 These points are at the northern and southern extremities of Cayton Bay, 

 and at low water, on the south side of Carnelian Bay. At the south point of 

 Cayton Bay we find the following descending section. 



a. Soft beds of argillaceous oolite, containing Amphidesma decurtatum, Belemnites 

 compressus, Avicula Braamburiensis, and large tuberculated spines of a Cidaris 

 resembling those in the layer (a.) p. 231 3 feet. 



b. Alternations of sandstones and carbonaceous shales 9 



VOL. V. SECOND SERIES. 2 H 



