File:The Quarterly journal of the Geological Society of London (1881) (14770758515).jpg

Identifier: quarterlyjourna371881geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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-side, and that the Ferruginous Oolite must be some distance below,and separated by a great mass of clay. The sequence, however, ishere perfectly clear; and on the opposite side of the valley, in the hillbetween Murvaux and Fontaines, the same succession is equally wellseen. Only at this spot the true Coral Rag has greatly developed, asmay be seen also by its examination in other places in the neighbour-hood. Thus the great quarries to the south of Dun show perhaps asmuch as 60 feet, consisting of a lumachelle of broken shells at the base,a Thamnastraean reef with Ostrea solitaria in the middle, and oolitebeds with Cidaris Jiorigemma at the top, all of which must be abouton this horizon, and which give an idea of the variability of theseries ; while in the valley leading to Fontaines the still coral-bearingupper limestones are largely developed, but without the character-istic urchin of the lower reefs and their equivalents. Passing next to Verdun, the student who has traced the lower
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508 J. F. BLAKE ON THE UPPER rocks so far has no difficulty in assigning to their true place themagnificent limestones which here astonish him and give him anidea of the grandeur of the development of the Corallian rocks in thisdistrict. The beds which in this locality overlie the FerruginousOolite are altogether different from any thing seen before, consistingat Haudainville of an unstratified mass of limestone 40 feet in thick-ness, made almost entirely of fragments of crinoids united by a cal-careous cement and yet distinct, forming a most admirable freestone :the only fossils seen in it are Cidaris florigemma and small oysters.Capping this mass in the quarry is 10 or 12 feet of ThamnastrseanRag with occasional Cladophyllice, but with abundance of Cidarisflorigemma, Terebratula maltonensis, and Pecten vimineus, also LimaIceviuscula and Venerupis corallensis. The position, then, in thislocality of the crinoid limestone is fixed; for it must be associatedwith the Rag above it, as for

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