374 Reviews — Oeological Survey — Siimmanj of Progress. 



Blue Bell Hill, and knowing the position of the veiy hard band ^ and 

 that only a depth of about 12 feet of chalk have been removed at 

 Borstal, explorations were made at the side of the path doivmvards as 

 far as the West Kent Waterworks boundary-stone. As on the former 

 visit, we obtained the characteristic fauna, includinp; a fine cast of 

 Prionocychis neptuni (Geinitz), and also proved that a considerable 

 thickness has to be allowed for this sub-zone. 



Following up my theory on returning home, I visited Kenley (in 

 the Caterliara Valley) two evenings afterwards, and went to the Hose 

 and Crown Quarry (32) accompanied by a friend, but finding the face 

 of the quarry too precipitous for working we crossed the railway at 

 the bridge and made our way about the top of the railway cutting to 

 the commencement of the viaduct. Here we were obstructed by 

 a thickness of nodular chalk ('hill-wash') and found that further 

 progress was impossible. We retraced our steps by the fence which 

 marks the railway company's boundary till we reached a spot which, 

 by the dip of the beds, I considered to be the horizon at which this 

 sub-zone should appear. After removing the superincumbent drift, 

 we found remains of Dentalium, Scajjhites, Gasteropod casts, and 

 sponges in hard white c^«^^- corresponding to the matrix at Borstal and 

 Blue Bell Hill. I think that the ' finds ' at this spot amply prove 

 the truth of my previous remark that the Reicssianum zone will be 

 found to be persistent and must not be looked for on lithological 

 grounds only, but on palseontological evidence. 



In conclusion, I may add that I am deeply indebted to ray friends 

 Messrs. Chatwin aiul Withers for the great interest they have 

 displayed in this matter and for assistance most cheerfully given. 



Note. Since visiting Kenley I learn that Messrs. T. H. Withers, F.G.S., and 

 C. P. Chatwin had already discovered this fauna in fallen blocks at the Kose 

 and Crown Quarry and at Whyteleafe. Similar corroboration may be expected 

 from other observers in the Chalk areas where outcrops or workings in the 

 Holaster planus zone occur. 



A subsequent visit to Amberley in Sussex has proved fruitful in revealing the 

 existence of the Reiissiamim zone in the quarry outside the station. 



I?,E-VIE-WS. 



I. SOMMAET OF PeOGRESS OF THE GEOLOGICAL SuEVEY OF GeEAT 



Britain and the Museum of Practical Geology for 1911. 

 pp. iv, 90, with 4 text-illustrations. London : printed for 

 H.M. Stationery Office, 1912. Price Is. 



rpmS memoir contains much of interest and importance concerning 

 J_ the work of the Geological Survey in various parts of Great 

 Britain. 



In the Denbighshire district work has been carried out among the 

 Carboniferous rocks, the grouping of which in the original one-inch 

 maps and in the memoir on the adjacent Flintshire district was 



^ The band exactly corresponding to the nodular band at Borstal has not yet 

 been found in situ at Blue Bell Hill, but there is every reason to expect that its 

 existence will be proved. 



