ON THE ERRATIC BLOCKS OF THE BRITISH ISLES. 329 
Erratic Blocks of the British Isles.—Report of the Committee, consisting of 
Dr. J. E. Marr (Chairman), Professor P. F. Kennan (Secretary), 
Dr. T. G. Bonney, Professor W. J. Sotzas, Mr. R. H. TippEMaN, 
Rev. S. N. Harrison, Dr. J. Horne, and Messrs. F. M. Burton, 
J. Lomas, A. R. DwErRyHOousSE, J. W. StTaTHER, W. T. TUCKER, 
and F. W. Harmer, appointed to investigate the Erratic Blocks of 
the British Isles, and to take measures for their preservation. 
(Drawn up by the Secretary.) 
Tue present report records a comparatively small series of erratics, and 
to this three causes have conspired ; the Committee consider that unless 
some new and significant facts of distribution are disclosed no useful 
results would accrue from the multiplication of records of well-known 
rocks from localities contiguous to those in which similar rocks have already 
been noted. The early date of the Leicester meeting has thrown the pre- 
paration of the report upon a time when the Secretary’s leisure-time is 
limited, and when many of the active workers are afield ; finally, a very 
large series of specimens are in the hands of the section-cutters. It is 
hoped that when they have been submitted to microscopic examination a 
valuable series of identifications will be obtained, especially among the 
basalts and dolerites of the east of England. Dr. Flett has kindly pro- 
mised to give the Committee his invaluable assistance in this work. 
The boulders recorded in the present report call for brief comment. 
The Shap granite and Borrowdale volcanic rocks recorded from Gelts- 
dale are extensions of the known range of these rocks across the outer 
ridge of the Cross Fell escarpment, though not beyond the drainage basin 
of the Solway. 
The series of records furnished by Messrs. Culpin and Grace are of very 
great value and importance, as they tend not only to connect the isolated 
groups of erratics in the country between Doncaster and Barnsley, but 
also to extend the area of boulder-strewn country in a north-easterly and 
south-westerly direction. Some light may possibly be thrown upon the 
remarkable group at Crosspool, near Sheffield. 
Mr. Hawksworth’s discovery of Silurian grit in a high-level gravel at 
Rothwell Haigh establishes the superior limit of age of that interesting 
deposit. 
The identification by Mr. J. H. Howarth of an example of a dolerite 
of the same type as that of Fans encourages the hope that other competent 
petrologists with experience of the basic rocks in other areas may clear 
up the uncertanity that has enshrouded the origin of the basalt boulders 
of Eastern England. 
Mr. Maule Cole’s observations may ultimately prove to be outside the 
purview of a Committee dealing with erratic blocks, as it has been sug- 
gested that the quartz pebbles which strew the higher Wolds of Lincoln- 
shire and Yorkshire are merely the relics, practically in situ, of Tertiary 
gravels that once overspread the area. In the meantime, however, while 
the question is swb judice, an impartial record must be kept. 
The occurrence of finely preserved ammonites from the Upper Lias 
under the Wold escarpment near South Cave derives its significance from 
