DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 211 
FIG. 10. — GEOLOGICAL SKETCH-MAP OF THE DISTRICT AROUND HACKNESS. 
The following is the sequence of the beds above the Lower 
Calcareous Grits in the Hackness section below Selpho Heights : — ■ 
Ft. Ins. 
1. Upper Calcareous Grit. Partly in situ, partly disinte- 
grated on surface ... 
2. Upper Coral Rag. A crystalline limestone made up of 
roundheads of Thamnastrwa concinna and borings 
of Lithodomi ... ... ... ... 12 0 
3. The Upper Limestone or Bell-Head Limestone. Mas- 
sive oolite limestone in several beds, very fossili- 
ferous with Astarte, Nerinea, Chemnitzia, &c, in 
upper part ; near the centre a strong band of 
shelly bed, with Thecosmilia, Phasianella, Cidaris, 
