198 DAVIS: SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 
dently of marine origin, and must be associated with the Millepore 
Beds. They are of very local extent, and the following section of 
them is exposed on the Cay ton Bay side of the Nab : — 
Ft. In. 
Ferruginous sandstone : Trigonia signata, Avicula, 
MyaciteS) &c. ... ... ... ... 4 0 
Sandy shale, with an ironstone band near the base ... 4 6 
Ferruginous band : Pecten clathratus, P. artievlatus. 
Avicula Braamhuriensis, Pholadomya Heraultii, 
Ostrea, &c. ... ... ... ... 1 0 
Sandy shales, with fossils in upper part, and ripple 
marks about half way down : Trigonia abundant, 
Aviculm, spines of Pseudcdiadema, and remains of 
plants ... ... ... .. ... 7 0 
Indistinct marly shales, about ... ... ... 8 6 
Millepore sandstone ... 
Total ... ... 25 0 
The following list of the most characteristic fossils from the 
Millepore Beds has been prepared by Mr. R. Etheredge : — 
Spiropora (Millepora) straminea, Phill. 
Pygaster semisulcatus, Phil. Trigonia recticostata, Lyc. 
Stomechinus germnians, Phil. T. conjungens, Phil. 
Pecten demissus, Phil. Pholadomya Heraultii, Ag. 
Pinna cuneata, Bean. P. Samianni, L. and M. 
Lima duplicata, Sow. Ceromya Bajociana, D'Orb. 
Gervillia lata, Phil. Natica adducta, Phil. 
Modiola imbricata, Sow. Chemnitzia vetusta, Phil. 
Unicardium gibbosum, Lyc. Actaeonina glabra, Phil. 
Goniomya literata, Sow, Cerithium Leckenbyi, Wr. 
Immediately above the Millepore Beds are the Middle Estuarine 
Series, consisting of thin bands of sandstone and shale with thin 
coals. They occupy most of the cliff and foreshore on the east side 
of the Nab, where they are more than 50 feet in thickness. On the 
west side of the point or Nab at Low Red Cliff they have diminished 
to 34 feet. The section in Gristhorpe Bay, on the east side of the 
Nab, is :— 
