DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 191 
base of the Grey Limestone Series and the top of the Upper Lias 
there is a thickness of nearly 500 feet, whilst at Hawsker the entire 
thickness is less than 300 feet. The section following is extracted 
from the memoirs of the Geological Survey (Quarter Sheet, 95 N.W.), 
and the whole of the series to the base of the Oolites is exhibited in 
the section : — 
Section or the Cliffs at and near Blea Wyke. 
C Massive false-bedded sandstone, resting 
on flaggy sandstone 
Grey Limestone J Sandy and calcareous shale, resting on 
[ bands of impure limestone 
j' Shales and false-bedded sandstone, with 
Moor Grit 
Series. 
Estuarine Series 
Millepore Bed 
Estuarine Series 
with 
Eller Beck Bed. 
Dogger Beds. 
occasional beds of fire clay and a thin 
[ seam of coal in the lower part 
C Nodular bands, with calcareous and fer- 
[ ruginous sandstone below . . 
Great masses of false-bedded ferruginous 
sandstone resting on shale, with bands 
of carbonaceous matter 
Thin flaggy sandstone, resting on a few 
feet of soft shale, enclosing thin bands 
of ironstone. (Eller Beck Bed.) 
Principally carbonaceous shales, with 
thin coal seams in the upper part, 
false-bedded sandstone in the lower . . 
Sandstone, oolitic in parts, with layers of 
small pebbles, and weathering into 
rounded blocks with ferruginous cas- 
ings, soft sandstone below graduating 
into the shales of the Upper Lias . . . 
Total ' 
Ft. Ins. 
40 0 
100 0 
100 0 
110 0 
15 0 
150 0 
95 0 
633 0 
The Dogger receives its name from its weathering into roundish 
lumps or doggers enclosed in a ferruginous casing. The lowest bed 
of the Oolites consists usually of reddish ferruginous sandstone, 
slightly calcareous, and is a littoral formation with numerous 
