DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 209 
Ft. Ins 
CO 
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— 
Yellow Foxy 
Grits. 
7 
2 
18 
2 0 
3 0 
False- bedded Grit, with small projections 
weathering black ... 
Soft sandy stone, with ferruginous nodules 
Parting, with Pecten subfibrosus 
Grey Gervillia I Irregular spongy grits, with Cylindrites 
Soft bed, with uneven base 
Fine-grained grey spongy grit, with Ger- 
villia aviculoides 
Fine-grained hard grey grit, with G. avicu- 
loides and Gryphoea dilatata 
Yellow sand and sandy grit, passing down 
into white massive spongy grit, with 
Gervillia, Ostrea, Pecten ... 
Yellow grit, with Gervillia 
Hard band of grit ... 
Shaly band, with Pecten subfibrosus, 
Ostrea mima 
Solid bed of grit 
Six or seven courses of sandy yellow 
spongy rock, with Rhynchonella, Pecten 
subfibrosus, Trigonia, Ammonites cor- 
datus 
Yellow sandy grit ... 
| Bright yellow soft sand, with siliceous balls 
| Hard massive grit, evenly jointed, and 
I with a spongy line on top ... .. 3 0 
Massive sandstone, passing down into shaly 
sandstone of the Lower Calcareous Grit 
The Greystone is a siliceous rock, very hard and false-bedded, 
and is quarried inland for building walls and repairing roads. The 
rock is about 25 feet thick, and expands in some localities, as the 
one N.W. of Sawdon, over considerable localities. In Thorntondale 
this rock has a massive character, and frequently stands out in lines 
of bold crags. In this district it is readily distinguished from the 
Coralline Limestone above, but the distinctive features disappear to 
