452 Rh. G, A. Bullerwell— Superficial Deposits 
the cementing substance of the nodules is remarkably rich in secondary 
silicic secretions. Septarian-like veins which traverse obliquely the 
nodules also show the partial silicification.”’ 
The earth underlying the bauxite at Christianburg was micro- 
scopically examined, and was found to contain a considerable proportion 
of orthoclase felspar in a very finely divided angular condition. Some 
minute angular grains showing the strie of plagioclase were also 
detected. It seems probable from this and from its chemical com- 
position that the arenaceous clay was derived from a different rock to 
that which gave rise to the bauxite, possibly from the granitite-gneiss 
which is the principal component of the fundamental complex of the 
Demerara—Essequibo district. 
(Lo be continued.) 
TV.—On rue Superriciat Depostrs ar tHe Foor or tHE CHEVIOT 
Hitts BETWEEN WooLer AND GLANTON. 
By R. G. A. Bunterwett, M.Sc. 
(PLATE XXXV.) 
Inrropuction.—Lying at the foot of the Cheviot Hills are deposits 
of sand and gravel, which, between Wooler on the north and Glanton 
on the south, cover a considerable area, occupying the greater part of 
the lower valleys of the Breamish and other tributary streams of the 
Till. They form mounds and ridges running in different directions, 
often dividing and reuniting in a very irregular manner. They are 
indicated, along with deposits at greater altitudes, on the Drift Edition 
of the Map of the Geological Survey of England (Sheets 109 N.W. 
and 110 8.W.) as “sands and gravels of Glacial age”. It is for 
the purpose of describing these accumulations and in some measure 
elucidating their source and mode of deposition that this paper is 
written. 
Lrrrrature.—Concerning these sands and gravels very little has 
previously been published. Professor G. A. Lebour, M.A., M.Sce., 
F.G.S.,! doubtfully places them along with other deposits in 
Northumberland and Durham, evidently more recent than the Boulder- 
clay, under the head of ‘‘ Upper Drift Sands and Gravels”’. 
Writing in 1872 on ‘‘Langleyford Vale and the Cheviots”’, 
Dr. J. Hardy? noted the water- worn character of the gravels. 
‘The Wooler Water,’ he says, ‘‘ works its uncertain way among 
congeries of ancient gravels and rolled masses, often disturbing and 
ploughing them up, but adding nothing to the spoils brought thither 
by earlier and more intensified agencies that scooped the channel for 
the present diminished stream.” 
Earlier still, in 1865, Mr. Tate, F.G.S.,3 in his paper ‘‘ Records 
of Glaciated Rocks in the Eastern Borders’’, pointed out the well- 
rounded gravels which had previously been referred to as Glacial 
Moraines by Dr. Buckland. 
1 Handbook of the Geology of Northumberland and Durham. 
2 Proceedings of Berwickshire Naturalists’ Club, 1872. 
3 Tbid., 1865. 
