208 DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 
Spongy Porous 
Grits. 
Ft. Ins. 
'Rhynchonella bed with fucoidal base, 
containing Pecten subfibrosus, G. avi- 
culoides ... . . ... ... 26 
Rhynchonella bed, with B. Thurmanni 
very abundant ... ... ... 10 
Spongy beds, shaly at base, with a band 
of G. aviculoides. Gryphova dilatata ... 1 6 
Gervillia beds, G. aviculoides very abundant 2 0 
Hard grey grit, with P. subfibrosus and G. 
aviculoides ... ... ... 2 0 
Grey gritty bed, full of Serpula, Ostrea 
mima, Pecten subfibrosus, and plant 
remains... ... ... ... 10 
Soft sandy beds in three or four divisions, 
with large sponge doggers, Serpula 
lacerata, P. subfibrosus, G. dilatata, 
Ostrea mima . . .. ... 10 0 
Hard gritty sandstone with doggers ... 2 0 
Massive sandstone, passing down into 
sandy sandstone .. ... about 50 0 
The upper beds of this series as they are traced along the cliff 
section towards Gristhorpe crop out and rapidly disappear, and both 
the Upper Limestone and the Filey Brig Grit have disappeared close 
to Filey Spa. 
III. The Scarborough and Hackness Sections. 
Lower 
Calcareous Grits 
The Passage Beds are very accessible on the north side of the 
Castle Hill at Scarborough, and about seven feet below the Lower 
Limestone Beds the series is so full of Gervillia as to have given the 
name of " Gervillia Beds " to the group. 
Section on the north side of Castle Hill, Scarborough. 
Ft. Ins. 
(Oolitic Limestone in several beds, with 
Echmobrissus scutatus, Ostrea mima, 
Gervillia aviculoides, and Trigonia ... 26 6 
