Identifier: quarterlyjourna541898geol (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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ee Kmahan, Quart Journ. Geol. Soc. vol. xxxiii. 1877, p. 31), is situated atpresent in t^e immediate neighb )urljood of the Straits of Dover. If the NorthSea during the Coralline Crag period was less open to the north than it is atpresent, as seems probable (see p. 351), the position of the head of the tidewould have been situated farther north than it is now, and the influence of thetidal currents from the south would then have been felt oif the coast of Suffolk.The fac;t that southern currents do not now penetrate to any extent into theGenuan Ocean is probably the reason why so few of the southern species ofmoUusca found in the English Channel and on the western coast of Englandoccur on the shores of Norfolk, (See Trans. Norfolk & Norwich Nat. Soc.1871-72, p. 42.) to ^ a to Oi 5^ CO g .^^ •c>s Ei ^ O s ^ ^ a s II «s CO r^ ^ rO S* ?s § .o $ 1^ o 10 5^ ^ 5i 53 ■t* -to1 S g o O so g ^ g o 1 « -< •iH
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Vol. 54.) LENHAM BEDS AND COKALLINE CKAG. 317 was accumulated previously to the deposition of the Coralline Crag,or cliffs of older Pliocene sandstones may have continued to existalong the south-western margin of the Crag sea during a part ofthe Eed Crag period. If the conclusions to which the facts here enumerated seem to pointbe correct, the Lenham Beds may be considerably older than theCoralline Crag, these two deposits being separated from each otherby an interval sufficiently long to allow for the consolidation andsubsequent denudation of the former,^ as well as for the disappear-ance from the Anglo-Belgian basin of a number of species ofmollusca which abounded in it during the Miocene, and continuedto do so until the earlier part of the Pliocene period. Although the Lenham Beds are connected stratigraphically withthe sands of Louvain and Diest, the molluscan faunas of the twodeposits, while presenting some resemblance, are, as to individualspecies, by no means identical. The dif

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