File:The Quarterly journal of the Geological Society of London (1881) (14584127079).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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escription of the coast only is byHebert (28), who gives very detailed sections, and divides the rocksstudied into (1) Coral Hag, (2) Upper Oxfordian, and (3) MiddleOxfordian. A further description of the higher rocks was promisedat the time, but has never yet seen the light. The continuationof the series on the opposite side of the Seine, at the Cap de laHeve, has been described by Dollfus (30), who recognizes threeportions of the Ximmeridgian, as (1) Ammonite-clays, (2) Pteroceras-marls, (3) Trigonia-clays and limestones ; and by Lennier (49), whogives a detailed section of the beds at the Cap de la Heve, andthence to Octeville. In the examination of this section the English geologist is atonce struck with the extraordinary resemblance of the series to thoseat Weymouth and Osmington. So close indeed is it, that almost bedfor bed can be recognized; and the whole becomes therefore an admi-rable term of comparison between the French and English rocks, 2 o 2 548 J. P. BLAKE ON THE UPPER
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JURASSIC OF THE PARIS J3ASIN. 549 if only the development in each country could be correlated respec-tively with these. The cliffs of Auberville are mainly composed of fossiliferous OxfordClay (known as Argile de Dives); and Caumonts section, in which heindicates the presence of Coral Rag, Upper Calcareous Grit, and Kim-meridge Clay beneath the Cretaceous rocks, is quite deceptive. Hebert,however, gives details of 33 beds seen in the central portion of the cliff,all referred by him to the Middle Oxfordian. His lower 19 divisions,comprising 195 feet of clays, with various bands of nodules, wouldcorrespond to the Weymouth Oxford Clay. To within 60 feet of thetop this is pure clay, and bands towards the base are very fossiliferous,the horizon being indicated by such fossils as Amm. Lamberti, A.arduennensis, Turbo Meriani, Modiola imbricata, Nucida ornata, andRliynclionella varians. These are succeeded by numerous bands offerruginous oolite, scattered in the midst of the clays through ath

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