2 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 
TABULAR VIEW OF THE SERIES OF YORKSHIRE STRATA. 
Utmost thickness. 
Chalk formation. 
Clay vale formation. 
( Smith) 
Feet. 
( 1 White Chalk 500 f The Wold hills from Flam- 
{ 2 Red Chalk 5 { borough to Hessle. 
3 Gault ? 
4 Kimmeridge clay 
Speeton, Knapton. 
Kirby-Moorside, Helmsley, 
Settrington, Elloughton. 
Coralline 
5 Upper calcareous 
grit 
6 Coralline oolite 
oolite formation. - 
7 Lower 
grit 
calcareous 
8 Oxford clay 
9 Kelloways rock 
Silpho Brow, Sinnington, 
Wass Bank. 
Scarborough Castle, Pick- 
ering, Malton. 
Scarborough Castle, Ham- 
bleton end, Malton, Lea- 
vening. 
Scarborough Castle, Salter- 
gate Brow, Rievaulx Ab- 
bey. 
Scarborough Castle, Hack- 
ness, Rievaulx Abbey. 
