Revieius — Geological Survey of Scotland. 29 



hearths, moulding sands, silica bricks, fire-bricks, and many other 

 purposes. In Scotland the examination of the coal-field has been 

 continued, most of the Highland staff being transferred thither, and 

 several volumes of special district memoirs have been published or 

 are in preparation. The Dairy iron-field has also been investigated 

 in detail as a likely source of further supplies of iron -ore of good 

 quality. The work of the Chemical Department has lain chieflj^ in 

 the analyses made in connexion with the report on refractories. 



The Summary of Progress also contains three important appendices 

 on deep borings, one in Yorkshire, 7 miles north-west of Doncaster, 

 the others in Kent and Sussex. The fourth appendix, by Mr. Gr. W. 

 Lamplugh, F.R.S., contains a summary of the present state of our 

 knowledge of the underground range of the Jurassic and Lower 

 Cretaceous rocks in East Kent, including a good deal of information 

 tliat has only become available since the publication of the memoir on 

 the subject in 1911. Some of these results were not accessible till 

 after the printing of Mr. Bakei''s paper on the same subject in 

 the December Number of the Geological Magazine. The general 

 result of Mr. Lamplugh's work is that the Jurassic and Lower 

 Cretaceous rocks together form a great wedge with a northward 

 apex, intervening between the Palaeozoic floor and the Gault, and 

 that the northern part of the Wealden anticline is superimposed 

 upon a syncline of the deeper rocks. This interesting result has 

 become much more clearly apparent from the later borings, although 

 it could be demonstrated from the earlier data. 



R. H. E. 



II. — Geological Survey of Scotland. 

 The Economic Geology of the Central Coal-field of Scotland. 

 Descriptton of Area II. Mem. Geol. Surv. Scotland. pp.iv-f89, 

 with folding maps and sections. Edinburgh, 1917. Price As. Qd. 



rriHE Scottish branch of the Geological Survej' is making rapid 

 JL progress with the publication of its excellent series of nine 

 mnmoirs on the coal-fields of Scotland. Those relating to areas V 

 and YIII have already been noticed in the Geological Magazine. 

 The present volume deals with area II, which lies almost wholly 

 within the county of Stirling, and includes the Coal-measures of 

 Banknock, Carron, Falkirk, and Slamannan, and the coals and iron- 

 stones of the limestone coal group of the Plean and Denny districts. 

 Tlie coal-seams are described with the usual amount of detail, and 

 from the figures given it is clear that the majority of them come 

 within the category of thin coals; these, however, will doubtless 

 be profitably worked in the future with improved methods and 

 machinery. The Millstone Grit Series of Cumbernauld, Castlecary, 

 and Bonnyhridge includes important beds of fireclay and gauister, 

 which are now of great and increasing importance as refractories. 

 Several analyses show that these fireclays are of very good quality 

 and iire likely to be largely developed within a short time. The 

 raised beaches, alluvium, and peat are also briefly described. The 

 peat is likely to be of considerable economic value, and indeed was 



