500 MB. F. W. HAEMEE ON THE [NOV. I907, 



the Rev. P. B. Brodie has stated that between that place and Wilmcote, 

 near Stratford-on-Avon, opposite the mouth of the Stour Valley, 

 many large flints and some hard chalk occur. 1 It seems, therefore, 

 that the Cretaceous Drift was carried down the Avon basin far 

 enough to the west to be caught up by the ice-stream which, 

 according to Mr. H. B. Woodward, ascended the Stour Valley 2 to 

 the Evenlode watershed, upon and to the south of which such 

 detritus is frequently found. Lucy has stated, for example, that at 

 Daylesford, about 400 feet above sea-level, more than half the 

 gravel is of flint. 3 At Aston Magna (about 400 feet O.D.), near 

 Moreton, Gavey found in a thick unstratified deposit of clay, sand, 

 and gravel, blocks of hard chalk, with very large flints, not 

 waterworn, and retaining their original white coating uninjured. 4 



At Paxford, nearly 500 feet above sea-level, in the same locality, 

 Lucy saw, exposed in a field, 4 feet of Boulder- Clay containing 

 flint, quartzose (quartzite) pebbles, Lias, greenstone, Millstone Grit, 

 and Charnwood syenite. 5 He has recorded also much Carboniferous 

 detritus — limestone, grit, and sandstone, on the Evenlode watershed, 

 or carried over it into the basin of the latter, an observation of 

 considerable importance which I can personally confirm. 



The association in the same deposit of Carboniferous and Triassic 

 detritus from the north, with hard chalk, grey flint, and red 

 chalk from the north-east, seems to me conclusive as to its Glacial 

 origin. 6 The occurrence of red chalk is especially interesting. It 

 cannot be very rare, as it was noticed both by Buckland and Lucy, 

 while Mr. Rastall and I found two or three pieces at one spot. 



Only two explanations of the origin of the Evenlode Drift seem 

 possible. Either the margin of the ice-sheet at the time of 

 maximum glaciation reached to the neighbourhood of Evesham, 

 a tongue of it being forced up the valley of the Stour to the 

 Moreton plateau, as Mr. H. B. Woodward has suggested, and as 

 I am inclined to think ; or the overflow from a Glacial lake, then 

 filling a part of the basin of the Avon, carried Bunter pebbles 

 and Lincolnshire flint towards the south. 



I see no reason for doubting that the flints found in the hill- 

 gravels near Oxford and to the north of that place, as at Long 

 Hanborough, were derived from the same source as the Glacial 

 drift of the Stour-Evenlode watershed. The gravels at Long 

 Hanborough are mainly Jurassic ; the flint-pebbles found in them 

 may equally have been brought from the Jurassic region to the 

 north. Similarly, the flint- and quartzite-pebbles which occur 



1 Eep. Brit. Assoc. 1874 (Belfast) p. 198. 



2 Geol. Mag. 1897, p. 485. 



3 Proc. Cottesw. Nat. E.-C. vol. v (1869-72) p. 102. This flint is of the 

 Lincolnshire type. 



4 Quart. Journ. Geol. Soc. vol. ix (1853) p. 35. 



5 Proc. Cottesw. Nat. F.-C. vol. v (1869-72) p. 100. 



6 The red chalk must have come from the Wolds, as did, I believe, the hard 

 white chalk and grey flint associated with it. The last two occur everywhere 

 and in preat abundance in the Chalky Boulder-Clay of the Midlands. 



