226 Revieics — Memoirs of the Geological Survey. 



Geological Survey of England and Wales. 



I. — The Geology of the Weald (Parts of the Counties of Kent^ 

 Surrey, Sussex, and Hants). By William Topley. (In part 

 from the Notes and MSS. of H. W. Bristow, W. T. Aveline, 

 F. Drew, 0. Gould, and Dr. C. Le Neve Foster. Lists of 

 Fossils revised by K. Etheridge.) pp. 503. 



II. — The Geology of Eutland and the Parts of Lincoln, Leices- 

 ter, Northampton, Huntingdon, and Cambridge, included in 

 Sheet 64 of the One-inch Map of the Geological Survey : 

 WITH AN Introductory Essay on the Classification and Cor- 

 relation OF THE Jurassic Kocks of the Midland District of 

 England. By John W. Judd. (Appendix, with. Tables of Fossils, 

 by E. Etheridge.) pp. 320. 



WITH the advance of Geology in the British Islands the progress 

 of our Geological Survey is intimately connected ; and the 

 numerous publications of Maps, Sections, and Memoirs show how 

 well its original object has been carried out, of arranging, in a form 

 easily accessible to the public, a complete body of information re- 

 specting the geological structure of the British Islands, and the dis- 

 position and extent of their mineral wealth. 



The most original work done by the officers engaged upon the 

 Survey is naturally in the mapping of the exposed surfaces of strata 

 on the Ordnance Survey Sheets, and the illustration of the structure 

 of the country by the publication of horizontal sections on a true 

 scale. The majority of the important cliff-, quarry-, a.nd pit-sections 

 have been studied and described by other geologists, who have also 

 contributed most largely to our knowledge of the paleeontological 

 history of the rocks. For while the geological surveyor, in carrying 

 on his work, examines most of the open sections but once perhaps, 

 and is continually entering fresh ground ; others studying the geo- 

 logy of a country may return again and again to the same tracts to 

 examine the local details and collect the fossils. And sections open 

 at one time may be closed at another. 



The illustration and description of the several tracts of country 

 examined during the course of the Geological Survey cannot there- 

 fore be regarded as complete, except the material be gathered from 

 all sources, and in the memoirs there is displayed a proper zeal to do 

 justice to all who have previously studied the districts and published 

 the results of their researches. As the number of observers is con- 

 stantly increasing, so the memoirs recently issued contain more 

 frequent reference to the observations of others, and are greatly 

 improved by exhaustive lists of all works relating to the country 

 described. 



The progress of our English Geological Survey has during the 

 past year been marked by the publication of two important memoirs 

 — the Geology of the Weald, prepared by Mr. Topley ; and that of 

 Eutland, by Mr. Judd. Although we have placed these two works 

 together for notice, we must yet treat them in a measure separately. 



