LIAS CLIFFS. 91 



feet. 



60 Grit rocks and thin shales in irregular succession, and of various thicknesses. 

 They generally appear thus : 



20 feet of grit of a white colour. 



6 to 10 feet of shale. 



20 feet of grit, at its bottom is ironstone, containing various plants, as 



cycadiform fronds and ferns. 

 10 feet of irony and carbonaceous shale. 



Conchiferous (dogger) series, analagous to the inferior oolite of Bath. This is best 

 exposed at Blue Wick, and contains the following beds, in the same downward order- 

 (See the enlarged section.) 



Feet. 



30 Fine-grained, yellow, micaceous, irony sandstone, in large blocks variously bedded 

 and jointed; containing several layers of pebbles and shells: (represented in 

 the enlarged section by dotted lines :) the upper one very ochraceous and full 

 of many shells, as turritella muricata, and t. cingenda, actaeon, trigonia, astarte, 

 SEC. The top is very irony, but without shells. A parting of shale, ironstone, &c. 



20 Fine-grained, yellow, micaceous sandstone in blocks of various forms, with nests or 

 irony masses of serpulas, lingulae, SEC. represented by dotted lines. 



20 Gray, micaceous, soft, argillaceous sandstone, mostly fissile, but not regularly plated 

 like the alum shale, to which it gradually changes in the lower beds : divided like 

 the lias by long joints, and filled with subramose masses of the same substance, 

 not unlike the beds at Cloughton. These beds form the scars which stretch from 

 Blue Wick, a short distance southward. On their surfaces lie irony nests of ser- 

 pula?, belemnites, aviculae, pinna 1 , &c. 



Below are the rough, sandy, upper beds of lias shale, which lower down become 

 regularly fissile, and are full of ammonites, belemnites, unioniform shells, SEC. 



LIAS CLIFFS. 



FROM Blue Wick, where it first appears, the lias formation is seen 

 along the whole shore by Whitby, Runswick, Staithes, Boulby, and 



N 2 



