16 



GEOLOOY. 



HUBERT, Prof. E. Comparaison de la Craie des Cotes d'Angleterre 

 avec celle de France. [Comparison between the Chalk of England 

 and that of France.] Bull. Soc. Geol. France, 3' ser. t. ii. pp. 416- 

 428. 



In a table the author thus states the parallelism between the divisions 

 of the Chalk of the Kentish coast and his own : — 



Henderson, J. On some Sections of Boulder-clay, Peat, and Strati- 

 fied Beds exposed in a Quarry recently opened at Redhall, Slate - 

 ford, near Edinburgh. Trans. Edin. Geol. Soc. vol. ii. part iii. 

 pp. 391-395. 



Describes and illustrates by a section the superficial deposits exposed 

 at the locality mentioned. H. A. N". 



Henwood, "W. J. Observations on the Detrital Tin-ore of Cornwall. 

 Journ. Koy. Inst. Cornwall, no. 15, pp. 191-254. (Traduction 

 par extraits in Ann. des Mines, 7^ ser. t. vi. pp. 114-130, with a 

 note by the Author on the localities where gold has been found in 

 Cornwall.) 

 These deposits in Cornwall and Devon have been worked for ages, 

 and are now nearly exhausted. This paper refers chiefly to those few 

 still in progress. A description of the lodes is given, and of some areas 

 (as near St. Austell) in which tin-ore occurs scattered through the 

 granite. The granitic gravel containing pieces of tin-stone, which oc- 

 curs in valleys draining the tin-bearing districts, is called "tin-ground," 

 The several workings in these valleys are described. The largest body 

 of stream-tin wrought of late years is near Eestronguet Creek, in the 

 Camborne granitic district ; this is worked by open cuttings and also 

 by shafts 50 or 60 feet deep. Wear Tregedna the stream-tin deposit is 

 overlain by from 20 to 30 feet of mould and hardened silt. 



The debris of the bed beneath the tin-ground always prevails in it. 



* This is a mistake. The Margate Chalk contains very few flints, and is not 

 included in division F, being above it. W. w. 



