DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 183 
Close-grained sandstone, ferruginous and calcareous, 
containingfourdistinct bands of Gryphcea, Gardium, 
&c. (forms the roof of Castle Chamber, a small 
hollow in the cliff at high-water mark) ... 3 0 
Hard sandy shale : A. margaritatus, Pecten,, 
Belemnites, &c, in bands ... ... ... 2 4 
Dogger band ... ... . . ... 04 
Hard sandy shale, with an 8-inch fossiliferous 
nodular band at the base ... ... ... 3 0 
Hard shale, darker than above : Pecten, Belem- 
nites, &c. .. ... .. .. 5 4 
Calcareous and ferruginous Dogger Band . A. capri- 
cornus ... ... ... ... 0 6 
Hard Shale ... ... .. ... 0 6 
Very hard ferruginous sandstone, containing layers 
of fossils : Dentalium giganteum being abundant 
in the uppermost ; A. capricornus, Bel. clavatus, 
Gryphcea cymbium, &c, abundant ; Cardium 
truncatum found occasionally (forms the floor of 
Castle Chamber) ... ... ... .. 4 6 
Sandy shale, with doggers and fossil wood ... 15 1 
Shale, with septariated nodules at base ... ... 10 
Shale, with dogger at base, very fossiliferous ... 7 5 
Thin sandy laminae, passing into a calcareous band, 
composed of G. cymbium and Avicula incequi- 
valvis, accompanied by A. capricornus, Encyclas 
undatus, Bhynchonella calcicostata, Belemnites, &c. 1 6 
Total ... 54 4 
The Ironstone Series, the upper division of the Middle Lias, con- 
sists of shales with thin bands of ironstone. The shales are soft and 
clayey in the upper and middle portions, hard and sandy in the 
lower ; the whole is very fossiliferous. At Peak Steel this series 
forms a hard triangular piece of rock between the two branches of 
the fault. Its equivalent is on the other side of the east branch of 
the fault, 360 feet higher up in the cliff. A couple of miles west- 
