DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 213 
T. corallensis, Buv. 
Trochus Aytonensis, B. & H. 
Delphinula muricata, Buv. 
Phasianella striata, Sow. 
Trochotoma tornata, Phil. 
Bulla Beaugrandi, De Lor. 
Ostrea duriuscula, Phil. 
0. gregaria, Sow. 
Exogyra nana, Sow. 
Modiola inclusa, Phil. 
M. Lycetti, Whit. 
Myacites ? sp. 
Terebratula insignis, Schub. 
Pseudomelania striata. 
Cylindrites Lindii. 
Ammonites cordatus, Sow. 
A. plicatilis, Sow. 
A. varicostatus 3 Buckl. 
Anomia? sp. 
Succeeding the Coralline Oolites, the uppermost beds of the 
Middle Oolites, are the Kimmeridge Clays, estimated by Mr. Fox- 
Strangways at more than 500 feet in thickness. These clays form 
the lower beds of the Upper Oolite Series. They are nowhere in the 
eastern part of the district exposed so as to show their relationship 
with the Coralline Oolites, they only actually come to the surface in 
the hills above Pickering, on the steep slopes of Thorpe Basset Wold 
and west of Brompton. These clays, however, occupy the large 
depressed area between Hemsley, Pickering, Malton and Filey ; and 
between Filey and Speeton they occupy the shore line, but are so 
deeply enveloped by glacial deposits that only a few small and doubt- 
ful sections can be observed. Occasionally they are exposed on the 
foreshore of the Bay under exceptionally favourable circumstances 
of wind and tide. Apparently they consist of dark-coloured shale 
with septaria, and thin fossiliferous bands of limestone. Besides the 
Kimmeridge Clay, the Upper Oolites comprise the Portlandian Beds, 
which are represented in this area by a band of Coprolites with 
Saurian remains, below which are a few feet of dark-coloured clays 
containing Ammonites gigas, Zeit, A. Gravesiansis, LP Orb, which are 
characteristic of the series. Their position is marked by the old 
coprolite workings, and the shales are occasionally seen near or on 
the shore. 
For more extensive information respecting the geological struc- 
ture of the area under consideration the student is referred to the 
works below, to which I am indebted for much of the information in 
this paper : — 
G 
