10 GEOLOGY. 



where the clays collected from were found are: — Tigh-na-Bruiach 

 (1. Boulder Clay, 2. Laminated Clay, 3. Shell-bed) ; Balnakaile Bay 

 (1. Boulder Clay, 2. Laminated Clay, 3. Arctic Shell Clay, 4. Fecten 

 maximus Sand and Clay); Ettrich Bay (succession obscure). A list 

 of fossils is given. G. A. L. 



Crutwell, A. C, The Great. Rhaetic Bone-Bed near Frome* Geol. 



Mag. dec. 2, vol. ii. p. 96. 

 Notes its discovery, at 310 feet deep, in a pit sunk to the Lower Coals, 

 about 2 miles N.W. of Frome. 



Daglish, T., and R. Howse, Some Remarks on the Beds of Iron- 

 stone occurring in Lincolnshire. Trans. N. Eng. Inst. Eng. vol. 

 xxiv. part i. pp. 23-33, 4 plates (map, plan, and sections). 



Iron-ore occurs in Lincolnshire in the Lower and Middle Lias, 

 Lower Oolite, and Neocomian. The L. Lias bed is a calcareous hydrated 

 oxide ; it is worked at Frodingham, occurs in the middle of the 

 L. Lias, and has a maximum thickness of 2b feet ; the p. c. of iron 

 varies from 12 to 40. The M. Lias ironstone also occurs near Froding- 

 ham ; here it is of poor quality ; but it improves to the south, and is 

 largely worked at Caythorpe, near Grantham ; this bed is probably 

 on the horizon of the Cleveland ironstone. The ironstone of the 

 L. Oolite is the equivalent of the Northampton Sand ore ; it underlies 

 the " Lincolnshire Limestone," is most fully developed near Lincoln, 

 but thins out to the north. It is a siliceous ore, containing about 

 40 p. c. of iron ; in some pits it partly takes the form of carbonate. 

 The Neocomian ore is worked near Caistor. It is a calcareous hydrated 

 peroxide, containing 25 p. c. of iron. The workable bed is about 

 7 feet thick, and abounds with shells of Pecien cincttis. Analyses of the 

 ores and sections of the beds are given. W. T. 



Dakyns, J. R., and J. C. Ward. Volcanic Rocks of the Lake-country. 

 Geol. Mag. dec. 2, vol. ii. p. 95. 



Note the discovery of beds of volcanic ash of the Green Slate and 

 Porphyry series interbedded with the Skiddaw Slates, at Swindale, 

 near Shap. W. T. 



Dalton, W. H. A Brief Sketch of the Geology of Colchester. Essex 

 Standard, Nov. 5. (Reprinted in a separate form.) 



The Chalk, Lower London Tertiaries, London Clay, Red Crag, Glacial, 

 Post-Glacial, and Recent Deposits occur in the district. The range, 

 nature, and fossils of each are described, and a list of points requiring 

 further research is given. W. H. D. 



Danvers, F. C. The Channel Tunnel. Quart. Journ. Sci. vol. xlviii. 



pp. 486-504. 

 An account of the various projects, with reference to geological 

 conditions. 



Davey, E. C. The Geology of Wantage and its surroundings. (A 



lecture.) Jackson^ s Oxford Journal^ no. 6369, April 24. 

 A general description of geology and its practical bearings. Describes 



