108 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



The fossils* found in Stratum "c" are — 



Cerithium variabile, Desk. Melania inquinata, Desh. 



Cyrena cuneiformis, Fer. Melanopsis buccinoides, Fer. 



deperdita, Sow. Ostrea Bellovacina, Desh. 



cordata, Mor. 



In addition to the ahove, the following fossils occur in Stratum 

 "6":— 



Ostrea tenera, Sow. Small vertebrae of Fishes. 



Hydrobia Parkinsoni, Mor. Vertebra of Lepidosteus. PI. III. 



Planorbis hemistoma. Sow. fig. 1. 



Psammobia Condamini, Mor. Cypris or Cythere ? 



In the light-coloured pehbly sands " «/' no fossils have yet been 

 found f. 



The persistence of the fluviatile clays from Woolwich to Rochester 

 is sufficiently apparent, but that of the associated pebbly sands be- 

 neath is not so. These latter, when the green grains and the pebbles 

 are absent, assume so closely the appearance of the Thanet Sands, 

 that in many places these two groups can scarcely be distinguished 

 one from another ; and the clays " b " repose upon sands which may 

 easily be mistaken for the Thanet Sands, and to which therefore they 

 might be considered subordinate, instead of being, as I believe them 

 to be, subordinate to the Woolwich group. The separation of the 

 two sands is, however, shown in a sufficient number of instances to 

 be marked and definite ; and even when this is not the case, a closer 

 examination of them will generally show that some distinction in the 

 mass does exist, however difficult it may often be in two such similar 

 arenaceous beds to distinguish the line of separation. 



Thus far either the mottled clays or the fluviatile clays of Wool- 

 wich have given a marked character to the middle division of the 

 Lower Tertiaries, but these mineral and palseoutological features 

 cannot be traced eastward of Rochester, and we therefore become 

 dependent upon other evidence for proof of the extension of the 

 " Woolwich and Reading series " into East Kent. As before ob- 

 served, the pebbly sands " o " at the base of this series often want 

 distinctiveness even in West Kent, and this becomes still more ap- 

 parent as the beds trend eastward ; there is a difficulty therefore in 

 connecting the Woolwich and Upnor sections with those of Heme 

 Bay and Canterbury, owing to our havmg to rely almost entirely upon 

 these beds («) in our traverse across the intervening district. The 

 outcrop of the Lower Tertiaries between the Medway and Faversham 

 rarely extends beyond the low ground at the base of the chalk 

 hills, and consequently there are few of those long lane-sections so 

 common on the hills in West Kent. I have not in fact been able to 

 find one clear section of the whole of the middle division anywhere 

 between the above-named places. Of the Thanet Sands there is no 

 want of sections, and occasionally there are small sections of the 

 lower part of the middle division ; scanty, however, as they are, they 

 all exhibit the same features and prove the continued superposition 



* For the fossils and details of " i." see Jouru. Geol. Soc. vol. vi. p. 264. 

 t The fossils both of " c " and " b " require probably further working out. 

 Both these beds vary shghtly in structure in close adjoining pits. 



