WILMORE : THORNTON, MARTON AND BROUGHTON-IN-CRAVEN. 359 
Shales. 
Thin limestones. 
Shales. 
Dark limestone. 
Caninia bed. 
Black shales. 
The Caninia bed consists of crinoidal and shell debris, 
exactly like that of Rain Hall, and it contains Caninia cornu- 
copix in abundance, as well as Michelinia, which weather out 
just as they do at Rain Hall. There can be no doubt of the 
identity of the bed in the two quarries. The officers of the 
Survey took the base of the Upper Shales as the upper limit of 
the Carboniferous Limestone. 
There is consideiable disturbance here again. There is 
a famous fault, which was sketched by Phillips and again in the 
Survey Memoir. It is a fault with an almost vertical hade (see 
Plate XL VI., Fig. 1). 
The distance from Rain Hall Plantation to the edge of Gill 
Rock is almost exactly 800 yards. Given a dip of 60°, this would 
mean a thickness of 1,600 feet. But the beds between Rain 
Hall Plantation and Rain Hall Quarry cannot be more than 
about 240 feet thick. Add to this, say, 60 feet before we get 
to the Caninia beds, and we have a thickness of not more than 
300 feet. There must be much folding between Rain Hall and 
Gill Rock, and the estimate of 1,000 feet or so, given by the 
officers of the Survey, seems much more than is warranted. 
I should say that 300 feet or so is the maximum thickness of 
these beds, all of which are of high D type, probably all Ds. 
There is little of importance to write concerning the ex- 
posures numbered (9) to (15) on the map. The rocks in the Gill 
itself, near Gill Church, are almost completely overgrown. A 
small exposure in the road side near Thornton Church, (10) on 
the map, shows beds of the same type as Rain Hall Plantation, 
with exactly the same fossils. There is here a small bay in the 
north side of the long hill of the anticline, and the road winds 
along the side of this bay. We thus get into the middle of 
the anticline and see the same lower beds as at Golf Links and 
Rain Hall Plantation cuttings. 
