DAVIS: SECTIONS IN THE LIASSIC AND OOLITIC HOCKS OF YORKSHIRE. 195 
Beyond the Fault the Millepore Bed may be seen at the top of 
High Moor over the Peak Alum Works. 
The Millepore Beds take their name from the small Polyzoan, 
Spirapora (Millepora) straminea, Phill, the remains of which in 
some places occur in great numbers, weathered on the surface of the 
rock. 
The Middle Estuarine Series are 80 to 100 feet in thickness 
and consist of shales, with three or four well-marked beds of sand- 
stone, containing a great abundance of plant remains. The sandstones 
are rarely persistent, and frequently die out in short distances. It is 
in this series that the soft jet used to be worked. East of the Peak 
Fault these rocks have an expanse to the cliff towards Blea Wyke 
where they include a coal seam 10 inches in thickness. The section 
exposed in the cliff is : — 
Dark shale, coaly at base 
White rubbly false-bedded sandstone, with shale 
partings ... 
Hard white sandstone, with Equisetites . . . 
White shale, with carbonaceous band at top 
Coal seam ... 
Shale 
Sandstone, hard and white 
Millepure bed at base . . 
Total 
Ft. Ins. 
2 6 
40 
3 
20 
0 10 
3 0 
3 0 
72 4 
Above the Middle Estuarine Series there are the Scarborough and 
Grey Limestone Series, the Moor Grit and the upper Estuarine Beds. 
The Scarborough or Grey Limestone Series is the most important 
of the marine beds of the Middle Oolites. In the district now under 
consideration it varies up to 90 feet in thickness. It consists of cal- 
careous and siliceous bands with partings of shale. A fine section is 
exposed at Cloughton Wyke, and it has a regular outcrop northwards 
to the Peak Fault. At Blea Wyke it appears to attain its greatest 
thickness, and forms the uppermost bed of the amphitheatre already 
mentioned. Above the Point the following section is exposed : — 
