Yol. 50.] MR. F. CHAPMAN ON THE BAEGATE BEDS OF SURREY. 677 



42. The Bargate Beds of Surrey and their Microscopic Contents* 

 By Frederick Chapman, Esq., F.R.M.S. (Communicated by 

 Prof. T. Rupert Jones, F.R.S., F.G.S. Read June 20th, 1894.) 



[Plates XXXIII. & XXXIV. ] 



Contents. Page 



I. Introduction , 677 



II. The Bargate Stone and Pebble-beds in Littleton- lane Quarry, near 



Guildford 673 



. III. The Bargate Strata below St. Martha's Chapel (Chilworth) 681 



IV. Clay-seams in the Bargate Pebble beds at Godalming 687 



V. Beds below the Folkestone Series in the Horsham Road, south of 



Dorking 687 



VI. Ostracoda and Foraminifera of the Lower Greensand 688 



VII. Ostracoda from the Bargate Pebble-beds of Littleton and of 



St. Martha's Hill (Chilworth) 688 



VIJI. Foraminifera from the Bargate Beds, or their equivalents, atLittleton, 



St. Martha's Hill (Chilworth), Godalming, and Dorking 693 



I. Introduction. 



That division of the Lower Greensand known as the Bargate Beds 

 is of especial interest on account of the varied character of its 

 organic and inorganic constituents, many of which are derived from 

 older rocks. 



In 1856 : R. A. C. Godwin-Austen wrote in reference to these beds : 

 " Whatever may have been the original range of the Oolitic group 

 over the area now covered by the Wealden and Cretaceous formations 

 of the S.E. of England, there is evidence that it has been reduced 

 by the abrading action of the Lower Greensand sea along its coast- 

 line. The shingle-beds of the Lower Greensand of Surrey and 

 Kent contain, in addition to the materials already alluded to, a 

 considerable number of extraneous fossils, such as the bones and 

 teeth of Oolitic Saurians, Ammonites Lamberti and A. crenatus of 

 the Oxford Clay, in great abundance, together with Terebratula 

 fimbria and Rhynchonella oolitica." 



The correlation of these Bargate Beds, with others of Lower 

 Greensand age in the area east of that where the first-mentioned 

 occur, cannot be regarded as settled. The Bargate Beds have been 

 placed by the Geological Survey at the top of the Hythe series, 2 

 whilst Mr. C. J. A. Meyer regards them as forming the basement 

 beds of the uppermost or Folkestone series. 3 



It is not my intention here to discuss at any length their strati- 

 graphical relations ; but a summary of the evidence gathered after 

 some detailed work in the Guildford and Dorking districts may be 

 of some use in correlating these strata. It has led me to regard 

 these beds, which are intermediate between the Folkestone and 

 Hythe series, as fairly distinct from the upper and lower series 



1 Quart. Journ. Geol. Soc. vol. xii. p. 71. 



2 W. Topley, Geol. Surv. Mem. ' The Geology of the Weald,' 1875, p. 121. 



3 ' On the Lower Greensand of Godalming,' le68, p. 10 ; in Suppl. to vol. i. 

 Proc. Geol. Assoc. (1870) 



3a 2 



