182 
CO 
Oldham, illustrated by a wood-cut showing the two beds of 
till and the intervening sand and gravel. 
At page 451 he states, “We have no- 
where been able to discover the lower 
£ sand No. 4 in situ during our examina- 
« tion.” 
| Professor Hull’s classification has been 
| adopted by Mr. De Ranee, F.G.S., and 
® other authors connected with the geo- 
° logical survey. In order to test the value 
of this classification of the drift betwixt 
Manchester and Oldham, a distance of 
j? between six and seven miles, the sinkings 
g and borings of the district have been 
g collected, several of which have been 
PQ 
| supplied to me by Mr. Bailey, of Honey - 
£ well-lane, Oldham. By practical men 
” the term “marl” is used for till, and 
when the clay is full of pebbles it is 
called strong, or stony marl. Of course 
"a the sinkings are more to be relied on 
s than the borings, but it is surprising how 
| skilled borers by long experience are able 
to detect small variations in the struc- 
ture of deposits. 
Professor Hull’s general section is here 
^ given, and the letters A, B, C, and D, are 
c3 
3 marked upon it to designate the points 
S where the actual sinkings and borings 
0 
” have been made. The line is not a 
© 
1 straight one, but makes a considerable 
- curve to the north by Blackley, and my 
j sections are not all on the line, but 
j some to the east and others to the west 
^ of it. 
hi 
