420 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Mar. 21, 



In^the eastern part of Surrey there are some Tertiary outliers on 

 or near the crest of the Chalk escarpment*. These consist chiefly of 

 masses of pebbles, and are not shown on the Geological Survey Map, 

 as, when w orking in that district some years ago, I was led to take 

 them for Drift, not being then prepared for those overlaps in the 

 Tertiary bed*, of which longer study has shown me the existence ; and 

 I now think that these sandy pebble-beds belong to the Oldhaven 

 Series. There are a few smaU. outliers of the same in Kent, and also 

 of sand like that associated with the pebble-beds at Shottenden 

 HiU. 



A long and close examination of the Tertiary district of Kent has 

 led me to think therefore that its structure tends to show that 

 there may have been a southerly transgressiooif of the Woolwich Beds 

 over the underlying Thanet Beds, and still more of the Oldhaven Beds 

 over both. 



The transverse section in Plate XXII. may serve as a diagram of 

 the geological structure implied by the above theory. It does not 

 show an unconformity between the Thanet Beds and the Chalk, but 

 rather one in the midst of the Lower London Tertiaries, by means of 

 which their highest member overlaps the others and rests on the 

 Chalk. 



Por the sake of simplicity no outlier of the Woolw^'ch Series has 

 been shown, but only the greater irregularity caused by the overlap 

 of the Oldhaven Beds. 



§ 6. Fossils. 



Although this paper is founded wholly on geological evidence, apart 

 from that of fossils, yet the latter have not been neglected, either in 

 the field or at home ; and the accompanying list coitains, I beheve, 

 the name of every properly recorded fossil from these beds. The 

 authorities from which it has been compiled are as follows : — 



(1). The many lists scattereJ. through Mr. Prestwich's papers in 

 vols, vi., viii., and x. of the Quart. Journ. Geol. Soc. 



(2). The lists in the Geol. Survey Memoirs on sheets 7, 12, and 

 13. 



+(3). Prof. Morris's ' Catalogue of British Fossils,' 2nd edit. 1854. 



$(4). The Monographs of the Palseo-itographical Society, by Mr. 

 F. E. Edwards, Mr. S. Y. Wood, &c. 



(5). The ' Ca,talogue of the Fossils in the Museum of Practical 

 Geology,' 1865. 



(6). The Hst given by Mr. G. B. Sowerby in the paper by Mr. J. 

 Brown, Quart. Journ. Geol. Soc. vol. xv. p. 133 (see pp. 416, 417). 



(7). The lists by Prof. Forbes and the Eev. H. M. De la Con- 

 damine in the paper by the latter in Quart. Journ. Geol. Soc. vol. vi. 

 p. 440. 



* See Prestwich in Quart. Journ. Geol. Soc. vol. viii. p. 257, and in the 

 ' Waterbearing Strata around London,' pp. 135-36 (1851). 



t This word may perhaps be better here than " unconformity," as our notions 

 of conform^'ty and unconformity are not yet as clear as might be wished. 



I The names in the Hst have been corrected according to these works. 



