PKOCEEDINGS OF THE GEOLOGICAL SOCIETY. Ill 



February 26, 1890. 



J. W. HuLKE, Esq., F.R.S., Vice-President, in the Chair, 



Egbert B. C. Hambley, Esq., Salisbury, ^NTorth Carolina, U.S.A. ; 

 C. Nicholson Lailey, Esq., 15 Great George Street, Westminster, 

 S.W. ; and Donald MacDonald Douglas Stuart, Esq., Oldland, 

 Bristol, were elected Fellows of the Society. 



The List of Donations to the Library was read. 



The following communication was read : — 



" On the Relation of the Westleton Beds or ' Pebbly Sands * of 

 Suffolk to those of Norfolk, and on their extension inland, with some 

 observations on the Period of the final Elevation and Denudation of 

 the Weald and of the Thames Valley. — Part III. On a Southern 

 Drift in the Valley of the Thames, with Observations on the Final 

 Elevation and Initial Subaerial Denudation of the Weald, and on 

 the Genesis of the Thames." By Prof. Joseph Prestwich, D.C.L., 

 F.R.S., &c. 



The following specimens were exhibited : — 



Specimens from Pebble- Beds, exhibited by Prof. J. Prestwich, 

 D.C.L., F.R.S., F.G.S., in illustration of his paper. 



Three photographs of sections recording Glacial Action in East 

 Berkshire, exhibited by the Eev. Dr. A. Irving, P\G.S. 



Specimens and microscopic sections of lladiolarian Chert from 

 the Ordovician strata ( = Llandeilo-Caradoc) of the Southern Uplands 

 of Scotland, exhibited by Dr. G. J. Hinde, F.G.S., on behalf of the 

 Geological Survey of Scotland. 



In explanation of the latter, Dr. Hinde said : — 



" The specimens on the table are from strata of Ordovician age 

 (the equivalents of the Llandeilo-Caradoc series of Wales) from the 

 Southern Uplands of Scotland, in the Counties of Lanarkshire and 

 Peebleshire. They were sent to me for examination by B. N. Peach, 

 Esq., F.R.S.E., F.G.S., of the Geological Survey of Scotland, with 

 the view of ascertaining if the Chert of this series resembles that of 

 the Carboniferous rocks in being of organic origin. 



" Sections under the microscope show that the rock is filled with 

 minute spherical bodies, ranging up to one fourth of a millimetre in 

 diameter, in the majority of cases without structure ; but in one 

 specimen they can be seen to consist of simple or concentric lattice- 

 like shells, some with relatively long radial spines, precisely similar 

 in character to the shells or tests of recent and fossil Eadiolaria, 

 and it is probable that they can be included in the same genera with 

 recent forms* 



VOL. XL VI. i 



