Reviews — Geological Survey — Stolie-on- Trent. 563 



9. Pke-Eh^tic Denudation of the Bristol Area. — Dr.Callaway 



deals with this subject iu the Proc. Cotteswold Nat. Field Club, 

 1901, xiv (1). The paper gives a clear sketch of the country before 

 aud after Rhastic times, and is illustrated by two sections, one of the 

 Avon section and the other of the Avon gorge. 



10. Manchester Museum. — Mr. Hoyle's Annual Report for 1901-2 

 is highly satisfactory. The Rev. Arthur Dixon has given the museum 

 a fine collection of fossils, rocks, and minerals. Other geological 

 material acquired by gift or purchase is a series of rocks from. 

 Charnwood Forest, sections of coal plants selected to fill gaps in 

 the collection, collection of maguesian concretions, of stalagmites 

 and stalactites, Permian rocks from the Lakes and Isle of Man, and 

 cores from borings in the Isle of Man. 



S, IE "V" IIE AA7" S- 



I. — Geological Survey of England and Wales. Sheet 123 

 (Stoke-on-Trent). Solid and Drift Editions. Scale, 1 inch to 

 a mile. (Price Is. Qd.) 

 Memoirs of the Geological Survey of England and Wales. 

 The Geology of the Country around Stoke-on-Trent 

 (Explanation of Sheet 123) . By Walcot Gibson, B.Sc, F.G.S., 

 and C. B. Wedd, B.A., F.G.S. ; with Notes by George Barrow, 

 P.G.S. (1902. Price Is. U.) 



IT is necessary to discuss the Map and Memoir as separate items, 

 because so much of the technicalities of the production of the 

 map is new and important. It is incidentally stated in the preface 

 to the Memoir that " Both maps are colour-printed, and they represent 

 the first attempt to substitute colour-printing for hand-colouring in 

 the issue of the 1 in. Survey maps." We must heartily congratulate 

 those who originated the idea and those who have so ably carried 

 it out, for the result is highly praiseworth}^ and may be considered 

 as a triumph of geological map printing. The map will be, at any 

 rate, free from the personal errors of the colourist, and the colours 

 will be both more permanent and will always agree with the colour 

 index in the margin. This improvement, however, carries with 

 it a great reduction in price, the sheet being issued at Is. 6tZ. per 

 copy instead of 3s. ; and, by the way, the old quarter-sheet at 3s. 

 only measured 13^ by 10 inches, while the new sheet is 18 by 

 12 inches. The new sheet covers a somewhat different area, 

 taking in more ground to the west, and not including area to 

 the east which appeared on the old sheet. We hope that the new 

 issue of cheap, accurate lithographed geological maps will henceforth 

 replace the hand -coloured editions. 



The mapping is much more detailed. The four divisions of the 

 Upper Coal-measures are shown by distinct colours, with, in addition, 

 brighter colours for particular beds, such as limestones and a green 

 .^rit. We quite agree with the wisdom of making no distinction 

 between Middle and Lower Coal-measures, and rejoice to see that the 



