ON THE ERRATIC BLOCKS OF ENGLAND, "WALES, AND IRELAND. 121 



measured. Boulder of sandstone, 37 x 17 x 12 in., oblong, mucli sraootlied, 

 compaot. 



At Coal Yard — Boulder of sandstone, 34 X 20 X 15 in., oblong, rounded 

 and smoothed, compact, greyish yellow. 



In Village Street — b'ourteen boulders of sandstone, smoothed and 

 rounded, 21 x IG X 6 in., fine-grained, compact, yellow ; 24 x 18 x 6 in., fine- 

 grained, compact, yellow; 18 xlOx 11 in., gritty, loose, very dark, almost 

 black; 26x10 in. (buried), 23x9 in. (buried), and 18 X 7 in. (buried), 

 very compact, mottled, bright)red and yellow, fine, compact ; 31 X 11 X 11 in., 

 fine, compact, yellow; 17x11x11 in.; 14x13x10 in., grey brown, 

 gritty, glazed with calcite ; 17 X 12 x 9 in., very compact, reddish yellow ; 

 20x10x9 in., fine, compact, grey; 22x17x13 in., fine, grey; 17x11 

 xlOin. and 22x19x6 in., coarse, gritty, glazed with calcite. Two 

 boulders of flint, 27x10x6 in. and 23x11x5 in. Three boulders of 

 dolerite, 15 x 9 x 8 in. and 12x9x10 in., and one under 12 in. 



Lancashire and Cheshire. 



A valuable list and desci'iption of erratics which have been found 

 in the drainage areas of the Oldham Corporation Waterworks by Mr. W. 

 Watts will be found in the ' Transactions of the Manchester (Geological 

 Society,' Session 1887-88, p. 584 et seq. 



In the ' Transactions ' of the same society (Feb. 7, 1888) Mr. Herbert 

 Bolton describes the boulders in the high level drift of Bacup. 



Mr. Ratcliffe furnishes the following description of the erratics in 

 Dukinfield, Stalybridge, Millbottom, and Micklehurst. The term 

 ' boulder clay ' is used to denote the clays, marls, sands, and gravels 

 containing boulders, but must not be taken as always synonymous with 

 the lower boulder clay or 'till.' 



At Dukinfield the boulder clay rests upon the edges of the Upper, 

 Middle, and Lower Coal measures, from the river Tame to Line Edge, 

 and beyond to the base of Harrop Edge the drift consists of alternate 

 layers of clay, sand, and gravel ; in some cases thick layers of marl come 

 in between the upper sand and gravel. 



The top clay is extensively used for brick-making, the sand for 

 building and moulding purposes. The gravel contains often large 

 boulders, and almost in every case yields large quantities of water. 



At Dukinfield Hall there is a total depth of 20 ft. 7 in. to the rock 

 head, whilst to the north at Ashton Moss Colliery the section in the 

 sands, clays, and gravels, of which the boulders are formed, is as follows : — 



ft. in. 



Soil turf and sand 4 



Strong marl 11 



Sand and marl 16 



Dark wet sand 8 2 



Strong marl 11 4 



Sand and gravel 2 



Dry sand 8 6 



„ gravel 6 



„ sand . . . - 26 4 



,, marl . . . 6 



„ sand 11 6 



Wet , 17 6 



Strong marl 26 8 



Marl and stones mixed .7 11 



♦ 142 11 



