200 JOWETT AND MUFF : GLACIATION OF BRADFORD, ETC. 
one block of coarse granite out of the drift clay on the east side 
of Bowling Lane, between Bowling House and the Oaks."* 
Gibbins reported " at the N.W. of Bradford a few whin- 
stone boulders, similar to those of Scaw Fell, Cumberland, 
containing small garnets." f 
Prof. Carvill Lewis also records the find of "a piece of 
granite, six inches long, on the north side of Haworth Moor."{ 
A boulder of andesite of a Lake District type was found 
in the excavation for the foundations of Hodgson's Power- 
loom Works, just north of Frizinghall Station. 
It is well known that Lake District and Scottish rocks 
occur in the drifts to the south-west of a line stretching from 
Morecambe Bay by way of Longridge Fell to Burnley,§ but 
a few Lake District erratics have been found to the north-east 
of this line. Mr. J. H. Howarth|| has recorded a boulder of 
Borrowdale andesite from the Bolland Knotts, and Mr. A. 
Wilmore** has noted the presence of Lake District rocks near 
Trawden and Wycoller, which lie to the west of Combe Hill 
and Crow Hill. 
More recently Mr. E. E. Gregory If has recorded a boulder 
of Borrowdale ash from Far Slippery Ford, four miles west of 
Keighley. 
It would appear therefore that the few Lake District erratics 
which have been found in Airedale have been transported across 
the low part of the Pennine divide north of Crow Hill and have 
been carried down the south-west side of Airedale. 
The matrix of the houlder-clay varies more or less with the 
characters of the " solid " rock on which it rests, and of the 
* Brit. Assoc. Report (Bradford), 1873, p. 88. 
t Report of Erratic Blocks Committee, Brit. Assoc. Report (Bristol). 
1875, p. 91. 
t " The Glacial Geology of Great Britain and Ireland," 1894, p. 237, 
§ R. H. Tiddeman. " The Evidence for the Ice-sheet in North 
Lancashire." Q.J.G.S., vol. xxviii., 1872, p. 471. P. F. Kendall, in 
Wright's " Man and the Glacial Period," London, 1893, p. 146. 
II Erratic Blocks Committee, Brit. Assoc. Report, 1896, p. 372. 
** "The Glacial Geology of Burnley and District." Burnley Literary 
and Scientific Society. Transactions, vol. xv., p. 58 (publ. 1900). 
tt Erratic Blocks Committee, Brit. Assoc. Report (Southport), 1903, 
p. 231. 
