1870.] DE RANCE—LANCASHIRE AND CHESHIRE POSTGLACTAL. 661 
by Boulder-clay, which once had a great thickness over the lowland 
plain, as it has still over the equally low rock-surfuce in the Preston 
Fig. 3.—Sketch-map of part of Western Lancashire and Cheshire. 
[ SAWD HILLS NE = 
Cormssant 
a 
LIVERPOOL 
Fe e| | 
¢ Birkenhead Fiob ~S j The curved wavy line eine 
Base of Glacial deposits Aves? 25-feet contour. Scale 
eval with Hire rate Zingre SS 4 miles=1 inch. 
Tinotts Hole 
mark. aN 
Bromborough 
/P ee zg. q 
leas 
« \ Base of © 
Ie , Glacialde- © 
{ posits40ft. > C. E.R. 
district, but has since been swept away by marine denudation (as in 
