1854.] PRESTWICH — RECULVERS GRAVEL. Ill 



Section of Sand-pit on Wear Farm, near the Recuhers * . 



H 



b. Gravel, flint-rubble, and brick-earth 3 to 8 feet. 



c. Light quartzose sand, with seams of fine flint-gravel, in some of which shells 



are numerous ; contains irregular subordinate layers of laminated clay, with 

 traces of vegetables at (/. Immediately on the chalk is a band of large 

 angular flints, c" 8 to 12 feet. 



C. Chalk. 

 The other pit shows, with a few general features in common, a very marked 



difference in detail. The upper bed b is much more developed and predominant. 



The shells occur principally in seams of fine gravel in the lower 

 of the section : in a few spots only are they numerous. The greater 

 portion of the sands and gravel are without shells. Entomostraca, 

 however, appear to be more abundantly diffused, but still they occur 

 chiefly in certain seams or layers. 



I found a few bones of large Mammals, some apparently belong- 

 ing to the Ox. The shells are in a good state of preservation, and 

 consist of the following species, which Mr. Pickering has kindly ex- 

 amined and determined : — 



Cyrena consobrina, Caill. (C. trigonula, 



Wood.) 

 Opercular valves of Balanus. 



Bithinia tentaculata, Linn. 

 Ancylus fluviatilis, Milll. 

 Paludina or Rissoa ; very like the one 

 found at Grays. 



This list, although short, is of considerable interest, for we here 

 find the Grays or Nile Cyrena, together with two more distinctly 

 freshwater shells, associated with the distinctly marine genus, the 

 Balanus. The opercular valves of this Cirriped were found in 

 the fine gravel filling the interior of the Cyrence. The small Falu- 

 dina and the Cyrena abound in places. Imperfect traces of vege- 

 table remains occur in some thin seams of clay subordinate to the 

 mass of sand and fine gravel. The general character of the organic 

 remains indicates a local deposit accumulated on the spot, and in 

 comparatively tranquil waters. 



The fossiliferous bed is overlaid by a mass of gravel-rubble and 

 brick-earth, varying in thickness from 3 to 8 feet, and presenting 

 general phsenomena with respect to angularity of many of the flints, 

 rapid variation of structure, &c., analogous to that of the flint- 

 and chalk-rubble described at p. 105. The rubble, however, 

 instead of being derived chiefly direct from the chalk, is here com- 



* The more exact bearing of this pit is \\ mile in a direct line N.N.W. from the 

 Grove Ferry station (South-E astern Railway), and 2*7 miles southward (^ mile 

 west of due south) from the Reculvers old Church. 



