84 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DeC. 4, 



These facts seem to point to the coast-line of the sea of the 

 period ha\ang passed near the area in which these pipeclay-beds 

 occur. The prevailing character of the Corfe deposits is such as 

 would indicate them to have been derived from land consisting of 

 granitoid rocks, while the clays and sands of the beds which lie to 

 the north and east have been partly derived from rocks of the 

 Secondary and Older Tertiary Periods, supplying the dark clays and 

 the flint-pebbles which abound in them. 



There remain but two localities of which I shall speak, namely, 

 Alum Bay and High Cliff near Christchurch. 



Alum Bay. — At Alum Bay, the greater part of the fossiliferous 

 beds included in No. 29 of Mr. Prestwich's section * may be satis- 

 factorily correlated with those usually known as the Barton and 

 High Cliff series. There is a well-known and marked seam of 

 dark-green sandy clay, containing abundance of Nwmmulina Prest- 

 wichiana f. It contains Barton forms ; and therefore we may 

 safely carry the Barton series down so far, though it is lower in the 

 series than any bed from which fossils have hitherto been collected 

 at High Cliff. The same Nummulite-bed occurs there also. Com- 

 mencing with this bed, a descending section brings us, in about 

 15 feet, into beds of Bracklesham age. 



ft. in. 



10. Dark-greenish, coarse, sandy clay 3 



(Crowded with Nummulina Prestwichiana.) 



Rostellaria ampla. Pleiirotoma ? sp. 



rimosa. Voluta atlileta. 



Murex asper. depauperata. 



Typhis pungens. maga. 



Cancellaria. — — nodosa. 



Pyrula nexiHs. Mitra parva. 



Fusus bulbus. Marginella. 



carinella. Natica labellata. 



errans. Turritella imbricataria. 



interruptus. Phorus agglutinans.- 



longaevus. Calyptrsea obhqua. 



Nose. DentaHum. 



regularis. Ostrea flabellula. 



unicarinatus. ? dorsata. 



n. sp., as at Hunting Br. Pecten corneus. 



and Hill Head. Cardium (small species, like that of 

 jStrepsidura turgida. High Cliff). 



Cassidaria ambigua. Corbula pisum. 



Ancillaria. Pholadomya. 



Pleurotoma turbida. Echinoderm. 



conoides. Opercuhna. 



plebeia. Nummulina Prestwichiana. 



9 (6). Lead-coloured clay, with few fossils 3 



Kostellaria macroptera. Corbida pisum. 



* Quart. Journ. Geol. Soc. vol. ii. pi. 9. See also the elaborate section at 

 p. 136, and pi. 9, Mem. Geol. Surv., Isle of Wight, 1856. 



t See note, on the determination of this Nummulite by Mr. T. E. Jones, to 

 the paper by Sir C. Lyell on the Belgian Tertiaries, Quart. Journ. Geol. Soc. 

 vol. viii. p. 334. See also Appendix B, p. 93. 



