234 Reports & Proceedings — Geological Society of London. 



gravels are the remnants of a once-continuous sheet, they appear to 

 have been deposited in a fan on a sloping surface which conformed in 

 its general outline to the present configuration of the Thames valley ". 

 (p. 59). Pieces of chert probably derived from the Lower Greensand 

 of the high ground about Hindhead are common in these gravels. 



The third, eastern and north-eastern, part of the district is covered 

 by river gravel and brickearth. It comprises the whole area north 

 of the Thames and small tracts to the south of that river and by the 

 River Wey. The authors separate the gravels into three terraces — the 

 100 feet terrace or Boyn Hill Gravels, tbe 50 feet terrace or Taplow 

 Gravels, and the lower terrace or Flood-plain Gravels — and they 

 observe that these divisions appear to correspond with the sequence of 

 types of flint implements. Thus the Boyn Gravels are characterized 

 by implements of Chellean and Acheulian types, while that of 

 Le Moustier first appears in the Taplow terrace, though this contains 

 also occasional specimens of the older forms which are probably 

 derivative, (p. 67.) 



The river gravels younger than those of the Taplow terrace are 

 included in the Flood-plain gravels. There was a considerable area 

 of brickearth mainly resting on gravels belonging to the Taplow 

 terrace, but it has been largely removed for brick-making. The 

 authors describe the Alluvium and peat, and give an interesting list 

 of land and freshwater shells from a section near Old Windsor. 



In an Appendix a considerable number of wells and borings are 

 recorded. The Palaeozoic floor has not been reached in the district, 

 the Lower Greensand being the oldest formation touched. This is not 

 surprising, as the base of the Gault is here at a great depth more than 

 1,000 feet below Ordnance datum in the tract to the south of Slough, 

 as will be seen on reference to the maps by Dr. Strahan in his 

 Presidential Address to the Geological Society for 1913. 



EEPOETS ^.IN-ID PEOCEEDING-S. 



I. — Geological Society of London. 



March 24, 1915.— Dr. A. Smith Woodward, F.R.S., President, in 



the Chair. 



The President announced the Award of the Proceeds of the Daniel- 

 Pidgeon Fund for 1915 to Mr. E. Talbot Paris, B.Sc, who proposes 

 to continue his researches on the Lamellibranchia of the Bhsetic, Lias, 

 and Lower Oolites of England. 



The following communication was read : — 



" The Stratigraphy and Petrology of the Lower Eocene Deposits of 

 the North-Eastern Part of the London Basin." By Percy George 

 Hamnall Boswell, B.Sc, F.G.S. 



The following divisions of the Lower Eocene occur in the area : — 



London Clay — Basement-bed only. - 

 The Pebble Beds and accompanying sands. 

 Beading Beds. 

 Tbanet Beds. 



