PRESTWICH WOOLWICH AND READING SERIES. 167 



EXPLANATION OF PLATES L IL IIL IV. 



Plate I. 



I. General Section. Gives a general view of the Tertiary series in their range 



from the Isle of Wight to the Isle of Thanet, chiefly for the purpose of 

 showing the correlation of the Middle and Lower Eocene deposits of the 

 Hampshire district with those of the London district, and also to give the 

 position and relation of the Lower London Tertiaries, of which latter beds 

 the succeeding diagrams give enlarged representations. 



II. Diagrams. These give the structure as determined from a niimber of actual 



(local) sections of the Lower London Tertiaries, and more particularly of 

 the middle division thereof, or the Woolwich and Reading Series. This 

 latter, in Diagram A, is divided horizontally into three areas — the western 

 one ( W.) unfossiliferous, the central one (C.) fluviatile and estuarine, and the 

 eastern one (E.) marine. In terming the first unfossiliferous, this is used 

 as a comparative term ; for a few rare fossiliferous beds do occur, as the 

 one containing the Ostrea Bellovacina, which is not unfrequently found at 

 the base of the series, but in no other part of it ; whilst a few feet higher 

 in the series the rich but local bed of fossil plants at Reading is placed. 

 Apart from these exceptions, the great mass spread through this area con- 

 tains no trace of organic remains. The horizontal extent of the fluviatile 

 beds is well-marked by the lenticular dark-coloured mass in the central 

 area. The marine character of C in the eastern area is apparent at a 

 few localities only; a large portion of the mass contains no fossils. 

 The numbers refer to sections actually observed ; of these the following 

 are described or mentioned in the text of this or of preceding volumes : — 



Diagram A. 



Loc. Sect. Page 



Hungerford 1 85 



Pebble Hill 2 85 



Newbury 3 87 



Red Hili 4 87 



Reading (Bath road) 5 88 



SonningHill 7 89 



Twyford, Berks 8 89 



Starveall 11 90 



Penlands 12 90 



Hedgerley 13 .. vi.268 



Uxbridge 14 91 



Hanwell 15 94 



Castlebear Hill 16 94 



Twyford, Middlesex 17 95 



Bayswater 18 96 



Trafalgar Square 19 148 



Bank of England 20 143 



In addition to the foregoing sections there are the following, which are not de- 

 scribed in the previous pages, and of which explanations are hardly necessary, as 

 they are either described elsewhere, or else the dotted lines show the beds they 

 traverse and the relative thickness thereof : — 

 Loc. Sect. 



6 Kate-grove pit, Reading. Dr. Buckland in Trans. Geol. Soc. ser. 2. 



vol. iv. p. 276. 

 10 Section at the brick-field on the hill between Maidenhead and 



Marlow. 



26 Experimental pit sunk on the S. side of Plumstead Heath. 



27 Well on Bexley Heath. 



28 Old pit on the hill W. of Crayford. (This is drawn too near 29.) 



30 Section on the sides of the lane leading into Darent Wood from 



Darent. 

 41 Well-section on Boughton Hill. 



Loc. Sect. Page 



Royal Mint 21 149 



Whitechapel 22 150 



Bromley, nr. Stratford ... 23 151 



Charlton 24 103 



Woolwich 25 102 



E. of Bexley 29 107 



E. of Green St. Green ... 31 107 



Gravesend 32 107 



Shorne 33 107 



Upnor 34 107 



Otterham Wharf 35 109 



Near Faversham 36-7 ...109 



N.W. of Boughton 38-9 ...109 



Boughton 40 109 



N.W. of Canterbury 42 110 



E. of Heme Bay 43 HI 



