BRITISH ISLES. 9 



and En^leboiirae), by W. Pen^elly ; near Buntingford in Herts, by 

 R. P. Grr3j^; South Notts, by R3V. A. Irving; Leicestershire, by J. 

 Plant ; Lancashire, by Ot. H. Morton ; Worcestershire and Yorkshire. 



W. T. 



Dairon, James. Notes on the Silarian Rocks of Dumfriesshire. 



Coll. Guard. voL xxxi. p. 662. 

 Nearly full report of paper read to Geol. Soc. Glasgow. 



Dalton, W. H. Subsidence in East Essex. Geol. Mag. dec. ii. vol. iii. 

 pp. 491-41)3. 



Gives evidence that the coast is subsiding or has been so within quite 

 recent periods. Fowlness, however, has been stationary since the Nor- 

 man Conquest. W. T. 



Danby, T. W. Elevation and Subsidence of Land in Jersey. Geol. 



Ma(j. dec. ii. vol. iii. pp. 143, 144. 

 Notes raised beaches and inland caves in Jersey and Sark. 



» 

 Davies, D. C. On Some of the Causes which have Helped to Shape 

 the Land on the North Wales Border. Proc. Geol. Assoc, vol. iv. 

 no. 6, pp. 340-352 ; 17 woodcuts. 

 The district referred to is that seen from the high land about Ifton 

 and St, Martin's, in the N.W. corner of Shropshire. The results of 

 subterranean movements in bending and breaking rocks are described ; 

 the influence of these movements, in conjunction with denudation, in 

 shaping hills and valleys is illustrated by examples classed as follows : 

 — Valleys of Upheaval, Depression, and Erosion ; Valley eroded at foot 

 of Escarpment ; Valley along a line of Fault ; Valley in Trough be- 

 tween two Faults ; Valley of Erosion in soft strata, bounded on either 

 side by hard ; small Faults ; Escarpments. The denuding agencies are 

 next described. Great effect is given to the sea in the excavation and 

 widening of valleys ; the denuding effect of an ice-cap is denied ; Ice 

 (as glaciers), streams, and atmospheric water are powerful agents ; but 

 atmospheric waste tends to check its own progress and to diminish its 

 own power. W. T. 



. On the Drift of the North Wales Border. Proc. Geol. Assoc. 



vol. iv. no. 7, pp. 423-439, pi. v. (sections). 

 The Drift is thickest between Oswestry and Wrexham ; but there are 

 thick deposits in hollows and valleys of the hilly country further W. 

 The Pre-Glacial Drifts (of local origin) occur only in hollows of the 

 Carboniferous Limestone. The Glacial Drifts are grouped into U. and 

 L. Boulder Clay, and Middle Sands and Gravels. Both Boulder Clays 

 contain local and northern stones, but no fragments drifted from the E. ; 

 the Scotch granites do not pass S. of Oswestry. The Middle Sands are 

 well stratified. In none of these deposits have contemporaneous fossils 

 been found. The Post-Glacial Drifts are redistributed gravels and 

 clays with marine shells ; without great care those beds may be mis- 



