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I.—On the Origin and Mode of Formation of the Concretions in the Magnesian Limestones of Durham

Published online by Cambridge University Press:  01 May 2009

E. J. Garwood
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Extract

In 1826, 27, and 28, Prof. Sedgwick contributed to the Geological Society of London his classical papers on the Magnesian Limestone of the East of England, in which he describes in detail the concretionary structures which occur in many of the beds of this formation in Durham.

Although he describes these concretions in minute detail, he says but little as to their probable origin, but it is clear that he regarded them as composed of carbonate of lime derived from the beds in which they occur, when he says—“The particles (of lime), after deposition, appear to have run into lumps and masses more or less crystalline, rejecting great portions of the earthy residuum.” Since Prof. Sedgwick's papers little seems to have been contributed to the subject of the mode of formation of these concretions.

Type
Original Articles
Information
Geological Magazine , Volume 8 , Issue 10 , October 1891 , pp. 433 - 440
Copyright
Copyright © Cambridge University Press 1891

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References

page 433 note 1 ProfSedgwick, , “On the Geological Relations and Internal Structure of the Magnesian Limestone,” Trans. Geol. Soc. London, 2nd series, vol. iii. 1835Google Scholar.

page 433 note 2 Op. cit. p. 89.

page 433 note 3 ProfGreen, , Physical Geology, p. 279Google Scholar; Geikie, , Textbook of Geology, 1885, p. 472Google Scholar.

page 433 note 4 Howse, R., “On the Stalactitic Origin of Conglobated Structures in the Magnesian Limestone,” Tyneside Naturalists' Field-club, October, 1889Google Scholar.

page 434 note 1 Hardman, , Carbonif. Dol. of Ireland, Proc. Roy. Irish Acad. vol. ii. ser. 2, 1877Google Scholar.

page 437 note 1 Browell, and Kirkby, , on “The Magnesian Limestone of Durham,” Nat. Hist. Trans, of Northumberland and Durham, vol. i. pt. 2Google Scholar.

page 437 note 2 Not aragonite, as often described locally.

page 440 note 1 Sollas, W. J., Ann. and Mag. of Nat. Hist, 5th series, vol. viGoogle Scholar.