83 
MARINE BANDS IN THE MILLSTONE GRIT OF WHARFEDALE. 
BY G. V. WILSON, B.Sc. 
{Read Uh March, 1909. Manuscript received 
Sth November, 1909.) 
About one mile to the north of Otley there is situated, on 
the sides of Chfton Beck, a large exposure which sliows the 
following succession, dipping at an angle of 12° to the south- 
east : — 
Top not seen. 
ft. in. 
50-60 0 Hard black shale, 
4 ... ... Black micaceous sandy shale. 
10 ... ... Yellow micaceous sandy shale. 
Weston Grit. 
Base not seen. 
At the base is the Weston Grit, which is seen in the bed 
of the stream, and this passes up into a soft, very micaceous, 
yellow shale, containing Glyphioceras bilingue, which is succeeded 
by a thin band of black micaceous shale, with Posidoniella 
loevis. Overlying this bed is the main mass of black carbonaceous 
shale with very little mica, which is very hard at the base, but 
towards the top becomes softer and more ferruginous, weather- 
ing into boxstones. 
In the lower part are several small layers of crystalline 
limestone with crinoid stems, but none of these layers is more 
than a quarter of an inch in thickness. There are also numerous 
smaU nodules, both of iron-pyrites and earthy limestone, with- 
out fossils. From the shale itself the following fossils have been 
obtained : — 
ECHINODERMATA. 
Crinoid stems. 
