WILMORE : THORNTON, MARTON AND BROUGHTON-IN-CRAVEN. 351 
North of Gledstone Hall, near West Marton, the strike of 
the beds changes completely, becoming almost north and south, 
and a series of exposures show dips almost due east, and there 
is a well-marked ridge with limestone scars. At the northern 
end of this series of exposures the dips change to north 
and north-east, while a little further afield north-westerly 
dips are seen. Hence there may be here a long hog's- 
back ridge with the western limb obscured by drift towards 
Horton. 
I will describe the beds in the following order : — 
I. — Those of the Thornton Anticline, (1) to (15) on 
sketch map. 
II. — Those of the Marton to Clint's Delf Series, (16) 
to (23) on sketch map. 
III. — The Marton Scar and Stainton Beds, (24) to (30) 
on sketch map. 
I.— The Thornton Anticline. 
About a quarter of a mile north-east of Thornton village 
there is a large quarry worked by Messrs. P. & W. Spencer.* 
There is no great thickness of beds exposed, as the quarry is 
being worked along the strike. The limestone is hard and 
dark in colour, and is very well bedded. There are shale beds 
of somewhat variable thickness, and it is from these calcareous 
shales that I have obtained most of my fossils. There is much 
calcite and some iron-oxide. The dip is from 60° to 70° south- 
south-east, but the direction varies slightly. The faces of the 
rock exposed by the quarrying operations show much slicken- 
siding. As the quarrying operations are continued the beds 
are seen to have been subject to much disturbance. Compare 
Rain Hall, GiU Rock, &c. 
I have carefully worked this quarry for some years, and 
I do not think any important types can have escaped my notice. 
* I beg to record my indebtedness to Messrs, Spencer for permission 
to visit their various quarries. 
