A HISTORY OF SURREY 



To illustrate the position in the wider geological scale of the forma- 

 tions recognized in Surrey, we give below, as preliminary to the next 

 table, a summary of the full succession of rock-systems according to the 

 commonly-adopted classification, indicating which divisions are already 

 known to exist in the county. 



We may now turn to consider the classification and subdivision of 

 the known strata of the county, as shown in the following table, including 

 those which crop out at the surface and those which have been found 

 only in deep borings. 



Valley, vol. i., by W. Whitaker (1889), for later information respecting the Eocene, the River 

 Drifts and other superficial deposits, and for discussion of the deep borings and deep-seated 

 geology, and vol. ii. of the same memoir for details of Surrey well-sections ; The Cretaceous 

 Rocks of Great Britain, vol. i., by A. J. Jukes-Browne (1900), for the Gault and Upper 

 Greensand, and vol. ii. (in press), by the same author, for the divisions of the Chalk. 

 The two first-mentioned memoirs contain full bibliographies of works on the geology of 

 Surrey up to the date of their publication ; and it has therefore not been deemed necessary 

 to give such references in the present sketch. References to some later papers will be found 

 in footnotes to subsequent pages, but for a fuller list the reader should refer to the account of 

 the bibliography for the period 1889 to 1899 contained in Mr. W. Whitaker's presidential 

 address for 1900 to the Croydon Microscopical and Natural History Club (Proceedings 1900, 

 pp. iii.-xvii.). The numerous reports of excursions in Surrey in Proceedings of the Geologists' 

 Association should also be consulted, as these contain lists of references, besides frequently record- 

 ing new observations. The greater part of the county lies within Sheet 8 (old series) of the 

 Geological Survey map, on the scale of one-inch = one mile ; but it also enters Sheets 6, 7 and 

 9 of the same map. 



