348 J. F. BLAKE AND W, IT. HUDLESTON OX 



connected with coral, is not quite clear, the fossil evidence having 

 been more or less melted up by some powerful action. 



Remarkable instances may be noted on both sides of the valley 

 of the Dove of the connexion of this class of bed with Coral Rag, 

 there well developed ; and in the neighbourhood of Kirkby Moorside 

 there are evidences of the " black posts," Coral Rag, and " throstler," 

 more or less inosculating with or replacing each other. 



Towards the edge of the vale the Upper Calcareous Grit con- 

 tinues to be of considerable importance : the town of Kirkby Moorside 

 is built upon a slope consisting mainly of this rock; and theKirkdale 

 cutting discloses about 16 feet without reaching the base. Towards 

 the top of this cutting are red sandy clays with calcareous disks and 

 nodules. Ammonites, some in a tilted position, were found at the 

 base of this, along with the valves of Ostrea bullata, exactly the 

 form so common above the " throstler " at Pickering. The remainder 

 of the cutting was seen to consist of hard blue rock, and of buff- 

 coloured calc-grits full of dichotomizing forms. Several Ammonites 

 of considerable size were found during the progress of the railway. 

 They may perhaps be referred to the following species : — ■ 



Ammonites Berry eri, Leseur. 



Achilles, 2)' Orb. (pi. 207. fig. 1). 

 „ decipiens, Sow. 



These forms have a strong Lower Kimmeridge aspect, and are 

 not unlike some of those from the Westbury ironstone, which occu- 

 pies a somewhat analogous position. The " throstler " has a great 

 development in certain situations beneath the Upper Calcareous Grit, 

 as is well seen in the bed of Hutton beck : the Upper Calcareous Grit 

 at this latter place has itself a thickness of not less than 30 feet, 

 and may be traced right up into the Kimmeridge Clay, which comes 

 on conformably, and even with a certain degree of gradation, as the 

 highest bed of the Upper Calcareous Grit is darker-coloured, fucoidal, 

 and more argillaceous. It is crammed with a Belemnite very near to 

 B. nitidus, Dollfus, and contains little nests of Serpula tetragona, 

 and numerous Pholadomyce. 



Behind the village of Nawton the development of these upper 

 beds is very similar to what we have seen elsewhere. Some tine 

 quarries occur, showing the central portions of the Coralline oolite, 

 here exceptionally hard and crystalline, but with abundance of 

 fossils, especially Gastropods, and in parts carbonaceous. The village 

 of Nawton is built, like Kirkby Moorside, on Upper Calcareous Grit, 

 which may be seen on both sides of the road. It has scarcely the 

 peculiar character here that it has at Pickering, but is more like an 

 ordinary Grit. 



Towards the mouth of Riccal dale, about 1 mile E.N.E. of Helms- 

 ley, we obtain a fine view of the Corallian development in this district 

 in a magnificent quarried face of 54 ft., having 4 ft. of Upper Cal- 

 careous Grit, 14 ft. of Coral Rag, and the remainder Coralline oolite 

 on the Pickering type, Phasianella striata being the most character- 

 istic fossil. 



