File:The Quarterly journal of the Geological Society of London (1867) (14595222117).jpg

Identifier: quarterlyjourna231867geol (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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ess, descends at Erith nearly to the river, towards which itoccupies the same apparent position as the Grays bed; but along theline of the section fig. 12 (as well as along other lines of sectiongiven in the memoir) it is cat down by a very sharp denudation,some 50 or 60 feet, to the gravels of the Cray and Darent and ofthe lower terrace, which have an extensive spread on either side ofGrays, and underlie the lower portion of the hrick-earth of that placeybeing worked in the fields after the brick-earth has been removed. The organic remains yielded by the two brick-earths being appa-rently that upon which Mr. Dawldns has based his opinion (for hehas given no structural sections in support of it), may not differ;but the physical evidence indicates their separation by an intervaladequate to the deposition of a slowly formed gravel of far-travelledmaterial 20 feet thick, and of a brick-earth (from 6 to 8 feet thick) 1867.) WOOD—SOUTH-EAST OF EX&LA>D. 409 •TTR «JO do:j no :jid
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410 PHOCEEDINGS OP THE GEOLOGICAL SOCIETY. (June 19, into which it passes upwards (distinguished in the memoir as ^4*),as well as to the break-up and denudation of both of these. Thesame underlying brick-earth (cc 4) also distinctly passes under themain sheet of the gravel (ce 4:) at Ilford -Station, forming a slightsynclinal, of which the two brick-pits of that place are the ex-tremities. The disturbances that broke up and elevated the Thames gravel,although giving rise to terraces, present no feature indicative of theuniform elevation of a valley by the general rise of the country, suchas has been described to us by Mr. Prestwich in the case of theSomme. The elevations, on the contrary, have been altogetherdislocatory and partial, the gravel being elevated on one side of theprincipal rectilinear throw as much as 116 feet above the presentsea-level, and thrown down to almost as great a depth below thePlumstead and Erith marshes. Moreover the chief portion of thatarm of the gravel whi

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