DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 179 
abundant in these beds and at the same time are restricted to 
definite lines. The highest beds with Am. armatus form the scar 
opposite Bay Town, where the dip is nearly due north ; thence they 
rise into the cliff, and about the middle of the Bay they reach an 
altitude of 90 feet above sea-level, and the dip of the beds is nearly 
west. The strata again descend and form part of the scar opposite 
Peak Fault, about 100 yards seawards from the foot of the cliff, and 
the dip is southwards. The cliff section is interesting, and the 
following beds may be traced without difficulty : — {see fig. 3). 
Ft. In. 
Soft dark shales, resting on hard sandy calcareous bed, 
with fucoidal markings ; Gryphcea and Belemnites ... 1 0 
Soft sandy shales : A. armatus, A. raricostatus, A. 
dudresseri, Gryphosa obliqata ... ... ... 5 6 
Sandy bands, Rhynclionella variabilis ... ... 5 6 
Hard calcareous sandy band, Modiola scalprum (forms 
the second well-marked scar) ... ... ... 20 
Sandy shale, with discs of ironstone resting on crinoidal 
remains ; several species of Ammonites in hard 
nodules ... ... ... ... ... 8 6 
Hard shales, with A. obsoletus at base .. ... 5 0 
Sandy shale : Belemnites and Grypli&a incurva ... 5 6 
Soft shale ... ... ... ... ... 0 2 
Hard sandy band ... ... ... ... 0 10 
(The three last beds form a double line in the cliff, and a 
small terrace at the mouth of Mill Beck, where a consider- 
able number of fossils may be obtained on the top of the 
terrace or ledge). 
Sandy shales ... ... ... ... ... 20 7 
(These contain two lines of small doggers or nodules in 
most of which A. gagateus occurs ; they also contain 
A. densinodus, A. raricostatus, A. impendens, A. Simpsoni, 
A. oxynotus). 
Hard calcareous bed, covered with fucoidal markings, 
crosses the mouth of Mill Beck ; Pseudoglyphwa ... 1 3 
Soft shale : Ilomomya ventricosa ... ... ... 0 3 
Hard calcareous band ... .. ... 0 9 
