436 



T. M. READE ON THE DATE OF THE LAST 



35. The Date of the last Change of Level in Lancashire. By 

 T. Mellard Reale, Esq., C.E., F.G.S., E.R.I.B.A. (Read 

 April 6, 1881.) 



In estimating geological time the difficulty always lies in getting a 

 reliable unit to measure with. Having surveyed and mapped out, 

 on a scale of 6 inches to the mile, the whole series of Postglacial 

 deposits between Liverpool and the mouth of the river Douglas, I 

 have often asked myself, Can the age of any of these deposits be 

 translated from mere sequence into years ? Observation has led me 

 to believe that an approximation may be made in the case of the 

 blown sand ; and this, as I will presently show, bears upon the title 

 of my paper. 



A reference to the map (1 inch to the mile) and section, figs. 1 & 2, 



Fig. 1. — Sketch Map of the Coast at Blundellsands, near Liverpool. 

 (Scale 1 inch to the mile.) 



