INTRODUCTION. 



17 



and south-west districts there is a striking difference as regards 

 petrological characters, thickness, and fossil contents. The sedi- 

 mentary rocks in the north-eastern area consist of a considerable 

 thickness of estuarine or freshwater deposits, with here and there 



Hood 

 Boy 



Oldftali 



Blea -fluke Pi V////A L\as 



SCARBOROUGH 



Who* Nob 

 Cautoa Bau 



Scale of Miles (l InchtoGHiUs) 



FIG. 1. Geological Sketch-map of part of East Yorkshire. 



a thin marine band, whereas in the other districts the Lower 

 Oolite rocks are almost exclusively of marine origin. The country 

 between Whitby and a few miles south of Scarborough is occupied 

 by Middle and Lower Oolite and Liassic strata ; the accompanying 



