280 Reviews— ^Memoirs of Geological Survey — 



and clays is no easy feat, and for it to transport masses of chalk 

 several thousand cubic feet in volume, perhaps for some miles, would 

 be yet more difficult. It is not explained by quoting cases of the 

 effect of waves in violent storms or of what a rush of water has done 

 when pent up in a narrow valley. The great chalk and other lime- 

 stone erratics of the more eastern part of England, the smaller but 

 still very considerable boulders of the more western and central 

 districts, have often been moved over a comparatively open district, 

 where the mightiest rush of water would quickly lose its force, or 

 have been transported across the general trend of the valleys. So, 

 though, as we have already said. Sir H. H. Howorth deserves the 

 gratitude of every student for these full storehouses of glacial 

 literature, we think that (to reverse the old saying) in seeking to 

 avoid Scylla he has been swept away by Charybdis, T. G. B. 



11. — Memoirs of the Geological Sukvey of England and 



Wales. 



The Geology of the North Staffordshire Coalfields. By 

 Walcot Gibson, B.Sc, F.G.S. ; with contributions by George 

 Barrow, F.G.S., C. B. Wedd, B.A., F.G.S., together with a 

 Paleeontological Account and List of Fossils by J. Ward, F.G.S. 

 pp. vii and 523, with 8 plates and 21 illustrations in the text. 

 (London: printed for His Majesty's Stationery Office: sold by 

 E. Stanford. Price 6s.) 



rpHIS memoir contains a detailed account of the Coalfields of 

 J_ North Staffordshire, especially those of the Pottery and 

 Cheadle Coalfields. 



The Pala3ontology of the Pottery Coalfield is described in detail 

 by Mr. John Ward, and is accompanied by full lists of the fossils. 

 Details of numerous pits and quarries are given in an appendix, 

 also a complete bibliography. There are numerous illustrations, 

 including a colour-printed map of the Cheadle Coalfield on a scale 

 of one inch to a mile, and six plates of the principal fossils of the 

 Coal-measures. 



The Triassic and Glacial deposits are described in separate 

 chapters. The economic products of the Pottery Coalfield are 

 described in chapter xii. The account includes the question of 

 the future coal-supply of the district, in addition to a description 

 of the local building-stones, clays, and marls, supplemented by an 

 enumeration of the chief sources of water supply. 



The Original Geological Survey was made on the Old Series 

 one inch map. Sheets 72 N.W., 73 N.E., and 81 S.W., published 

 during the years 1852-1864, the Coal-measures having been mapped 

 by Sir W. W. Smyth, Permian and Trias by Professor E. Hull, and 

 the subdivisions of the ' Yoredale Eocks ' and Millstone Grit by 

 Professor A. H. Green. The memoir on the Iron Ores of North 

 Staffordshire, by Sir W. W. Smyth, published in 1862, contains 

 a summary of the geological features of the coalfields; and brief 

 accounts of the northern end of the Pottery Coalfield, known as 



