32 



STRATA OF YORKSHIRE. 



is a broad tract of alluvial marshland, undulated by hills of diluvial 

 clay and gravel. 



These five divisions of the surface reach the coast in succession, and 

 mark it with very characteristic features. The shore of Holderness is, 

 like the interior, low and undulated ; the wolds terminate in long, lofty, 

 and connected cliffs ; a depression on the coast marks the line of the 

 vale of Pickering ; flat-topped heights characterise the oolitic formation 

 on the shore, as well as in the interior ; and the highest precipices on 

 the coast belong to the same series of rocks as the loftiest of the inland 

 hills. It will, therefore, be no unprofitable labour to attempt a con- 

 nected sketch of the geological characters of the five districts, into which 

 nature has divided the eastern part of this county, before we describe, in 

 greater detail, the sections which they present against the sea. It is, 

 however, necessary previously to exhibit a 



.!...> . '} ' f,V'P 



TABULAR VIEW OF THE SERIES OF YORKSHIRE STRATA. 



utmost thickness. 



Chalk formation. 



Clay vale formation. 

 (SMITH.) 



1 White Chalk 



2 Red Chalk 



3 Gault? 



Coralline oolite formation. - 



feet. 



500 )The Wold hills from 

 5 j Flamborough to Hessle. 



Speeton, Knapton. 

 , Kf\f\ Kirby-Moorside, Helms- 

 ley, Settrington, El- 

 loughton. 



\ fiO J Silpho Brow, Sinnington, 

 |- 60 



^ Wass Bank. 



f Scarborough Castle, Pick- 



4 Kimmeridge clay 



5 Upper calcareous 



grit 



6 Coralline oolite 



\ ( Scarborough Castle, Ham- 



7 Lower calcareous f 8Q J bleton end, Malton, Lea- 



J ( vening. 



"i ( Scarborough Castle, Salter- 



8 Oxford clay >-150 -< gate Brow, Rievaulx 



j ( Abbey. 



n v ) An f Scarborough Castle, Hack- 



9 Kellowaysrock | 40 | ness , Rfevaulx Abbey. 



