12 GEOLOGY. 



Fordham, H. G. On the Section of the Chloritic Marl and Upper 



Grreensaud on the Northern Side of Swanage Bay, Dorset. Proc. 



Oeol. Assoc, vol. iv. no. 8, pp. 506-516 ; woodcut. 



The beds are Grey Chalk 103ft., Chalk Marl? 40 ft., Chloritic Marl 



4 ft., U. Oreensand 70 ft., Gault. There is a slight break between the 



Chloritic Marl and the U. Grreensand. Lists of fossils are given. W. T. 



Foster, Dr. C. Le N. Remarks upon the Tin Deposits of East Wheal 

 Lovell. Trans, li. Geol. Soc. Cornwall, vol. ix. pt. ii. pp. 167-176 ; 

 4 plates. Berg- hutt. Zeitung^ vol. xxxv. pp. 417, 418. 

 The rich stanniferous pijws and bunches of East Wheal Lovell are 

 considered to be granite altered by vapours or solutions ascending 

 through very narrow fissures into an aggregate of quartz, mica, cas- 

 siterite and gilbertite, with some fluor-spar, copper-pyrites, copper- 

 glance, and chalybite. C. L. F. 



. On a Deposit of Tin at Park of Mines, St. Colomb, Cornwall. 



Jlep. Miners' Assoc. Cornwall for 1875, pp. 22-26 ; 5 woodcuts ; 



and Rep. Brit. Assoc, for 1875, Sections, p. 64. 

 The tin-ore occurs as lenticular layers, generally an inch or 2 inches 

 thick, between the planes of bedding of the Killas. The layers appear 

 to be the offshoots from N. and S. veins. ^ W. T. 



Geikie, Prof. A. History of the Deposits known as the Old Eed 

 Sandstone. Nature, vol. xiii. pp. 389-391 ; and Coll. Guard, 

 vol. xxxi. pp. 344, 345. 



Abstract of a paper read at Geol. Soc. Glasgow. 



Geikie, Dr. James. The Cheviot Hills. Good Words, vol. xvii. 

 pp. 11-15, 82-86, 264-270, 331-337 ; woodcuts. 



Describes the scenery and extent of the region. The Scottish side 

 is the most abrupt. The age of the igneous rocks, forming the greater 

 part of the range, is intermediate between that of the greywacke beds 

 and of the red and white sandstones (Upper Old Eed Conglomerate or 

 lowest Carboniferous) lying unconformably upon them. These igneous 

 rocks consist chiefly of porphyrites. At Hindhope the oldest of them 

 (the Ash beds) are to be seen. The early volcanic outbursts were sub- 

 marine ; but those at the close of the period of activity were subaerial. 

 In early Carboniferous times there followed another volcanic period, to 

 which the plugged-up vents of Euben Land, Black Land, &c. belong. 

 Describes the glacial deposits fully. The Cheviots were covered by the 

 ice-sheet when at its thickest ; but they divided the flow between Scot- 

 land and England. F. J. B. 



Green, Prof. A. H. Notes on Variations in Character and Thickness 

 of the Millstone-grit of North Derbyshire and the adjoining parts 

 of Yorkshire, and on the probable manner in which these Changes 

 have been produced. Bep. Bnt. Assoc, for 1875, Sectio7is, p. 65. 



The Millstone-grit of the district treated of was described in 3 sub- 



