140 Geological Society. 



further mentions that there is evidence to show that these deposits 

 have extended in a S. and S.W. direction across the Brent and Silk 

 Valleys, and now occur on most of the heights in the parishes of 

 Kingsbury and Willesden. As the sands, gravels, and Boulder-clay 

 which cover the Hendon plateau and the neighbouring heights are 

 found to rest on an undulating floor of London Clay, and to follow 

 the contours of the hills and valleys, the author considers that it is 

 clear that the main physical features of this portion of N.W. Mid- 

 dlesex were moulded at a very early stage in the Glacial period, and 

 before the so-called Middle sands and gravels and overlying Upper 

 Boulder-clay with Northern erratics were deposited. He believes 

 that at this time there could have been no barrier of any import- 

 ance to prevent these deposits from extending into the Thames 

 Valley, and that the evidence clearly points to the conclusion that 

 the implement-bearing deposits on the higher horizons in the Thames 

 Valley should be classed as of contemporaneous age with the un- 

 doubted glacial deposits at Hendon, Einchley, and on the slopes of 

 the Brent Valley, which they so closely resemble. The author is 

 therefore satisfied that man lived in the neighbourhood of the 

 Thames Valley in the early part of the Glacial period ; probably, he 

 thinks, in pre-Glacial times. 



June 10. — Sir Archibald Geikie, LL.D., F.R.S., President, 

 in the Chair. 



The following communications were read : — 



1. "Note on some Becent Excavations in the Wellington College 

 district." By the Rev. A. Irving, B.A., D.Sc, E.G.S. 



This paper furnishes new facts of Bagshot stratigraphy obtained 

 from open sections since the author's last paper was read on Nov. 

 12th, 1890. The whole sequence of the beds, as given in the 

 published section of the College Well, has now been verified at their 

 respective outcrops ; percentages of clay in the beds laid open in 

 excavations in March last along the critical portion of the ground 

 are given as results of mechanical analyses of samples of them ; and 

 the northerly attenuation of the green-earth series and of the quartz- 

 sand series is reduced to a question of mere measurement, for which 

 the requisite data are now to hand. 



The author claims to have demonstrated that the mapping of the 

 Geological Survey contradicts itself; that later workers in adopting 

 this as the basis of their work along the S.E. Railway have fallen 

 into serious error; and that a complete contradiction is given by the 

 facts to the adverse criticisms offered on his corrected section along 

 the railway, which was exhibited in November last, and is repro- 

 duced for the present paper. 



2. "Notes on some Post-Tertiary Marine Deposits on the South 

 Coast of England." By Alfred Bell, Esq. Communicated by R. 

 Etheridge, Esq., E.B.S., E.G.S. 



The author's object in this paper is to trace the successive stages 



