PROCEEDINGS OF THE COTTESWOLD CLUB 9 



The form of the boulder is due to attrition during 

 its transportation. From its being so coated with the 

 quartzose sand which is cemented round it, it is evident 

 that the boulder must have travelled a long way in the 

 sand. 



The Oolite slabs were really detached by the same 

 force which brought the boulder into its present position ; 

 the finding of fairly good impressions of Oolitic fossils 

 shewing the same history ; and the large quantity of 

 silica in the clay proves that it was derived from the 

 quartzose sand reduced by attrition. 



In my paper on the gravels I have recorded boulders 

 of Carboniferous hmestone. Millstone grit, Coal Measure 

 Sandstone, &c., &c., in the Northern Cotteswolds, but 

 not at so great an elevation ; and I have shewn that 

 Northern Drift pebbles and boulder clay are found at the 

 greatest altitude of the Cotteswold range. 



In Volume IX, p. 393, will be seen a description of 

 two Carboniferous pebbles attached to Great Oolite found 

 on Minchinhampton Common by Mr A. E. Smith, of 

 Nailsworth. 



It is, I know, very difficult to tho.se who are not students 

 of this part of the Earth's history to realise the changes 

 which then took place ; and after more than a quarter of a 

 century's work upon the subject, the general principles 

 seem to me established, although there is much difference 

 of opinion as to what occurred during the intervals 

 between the great disturbances. 



We have been taught that the Northern and Eastern 

 parts of England are the districts for the study of Glacial 

 action ; and it is true in these areas striation occurs more 

 frequently and is better seen, as the hard rocks retain the 

 impression of the striae, which our soft Oolites would not, 

 since they would be crushed from the want of density 

 to resist the pressure ; and I therefore claim, the top 

 of Cleeve Cloud as a fine example of Glacial denu- 

 dation. 



