DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 205 
occurs at Scarborough Castle. (Fig. 9. ) It is extensively quarried along 
the inland escarpment, and forms a good building stone which hardens 
with exposure. The Lower Calcareous Grit is richly fossiliferous, 
and the beds at Filey are comparatively full of fossils. At Gris- 
thorpe Cliff there occurs huge fossils of the genus Ammonite, and 
also a very large starfish, Astropecten rectus, usually found embedded 
in a calcareous sparry matrix. 
The following list of fossils is given as common to the lower 
portion of the Coralline Oolite and the Lower Calcareous Grit by 
Mr. Fox Strangways, in the Memoirs illustrating this part of the 
district : - 
Echinobrissus scutatus, Lam. 
Holectypus depressus, Lam. 
Rhynchonella Thurmanni, Voltz 
Exogyra nana, Phil. 
Gervillia aviculoides, Sow. 
Gryphaea dilata, Sow. 
Ostrea flabelloides, Lam. 
Ostrea solitaria, Sow. 
Pecten subfibrosus, D'orb. 
Pinna lanceolata, Sow. 
Astarte Duboisiana, D'orb. 
Isocardia tenero , Sow. 
Following on the series of the Lower Oolites exhibited in the 
magnificent amphitheatre of Blea Wyke, the Upper series of the 
Lower Oolites from the Millepore Bed to the Cornbrash have been 
traced in the scars and cliffs of the northern portion of Gristhorpe 
Bay and round the headland to Red Cliff in Cayton Bay, where the 
Cornbrash is exhibited on the shore. Superceding the Lower Oolites, 
the rocks of the Middle Oolites successively crop out of the sea-bed 
along the cliffs between the north of Filey Brig and Gristhorpe Bay, 
forming an imposing succession of ever-increasing magnitude and 
magnificence. Above the Lower Calcareous Grit is a series of beds 
considered as passage beds. At Filey Brig, where a good sequence is 
exhibited, they are called the Greystone Beds. These rocks in the 
Lucina obliqua, Buvig. 
Modiola bipartita, Sow. 
Pholadomya angustata, Sow, 
Sowerbya triangularis, Sow. 
Alaria bispinosa, Phil. 
Cylindrites elongatus, Phil. 
Dentaliuru entaloideum, Desh. 
Ammonites cordatus, Sow. 
A. perarmatus, Sow. 
A. plicatilis, Sow. 
Belemnites abbreviatus, Mill. 
