164 MAPPING OF MILLSTONE GRIT AT LONG ASHTON. 
owing to its superficial nature. The following is, however, my 
reading of it : — 
Brownish sandy beds 
White close Sandstone 
Yellow and brownish-red sandy Marl, with white-Clay 
Marl bands ... 
Purple Marl 
Hard Limestone ... 
Friable yellow-red Sandstone 
Close-grained hard Sandstone 
Purple Clay Marl 
Limestone, massive, and highly ferruginous in parts .. 
Silicious Shale with black ferruginous bands... 
Solid Limestone ... 
FEET. 
6 
1 
8 
4 
24 
18 
8 
The position of this cricket-field section is marked a on the 
map. The beds clearly belong not to the Millstone Grit but to 
the Upper Limestone Shales. 
At the point marked b are several old quarries in which a 
hard purple limestone has been worked. I take it that these 
limestone beds, which I estimate at 20 or 25 feet in thickness, 
overlie somewhat closely the top beds of the cricket-field section, 
and there are indications of a sandstone bed in turn overlying 
them. 
At the point marked c on the map Millstone Grit has been 
largely quarried. The beds dip at an angle of 23^°. 
From the lowest grit exposed, tl^e sandstone bed which marks 
Mr. Sanders’ boundary is distant about 126 paces in a horizontal 
line at right angles to the strike of the beds. This would give 
a thickness of say 143 feet, of which, as we have seen, 89 feet 
