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Image from page 194 of "The Quarterly journal of the Geological Society of London" (1845) | by Internet Archive Book Images
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Image from page 194 of "The Quarterly journal of the Geological Society of London" (1845)

Identifier: quarterlyjourna231867geol

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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Text Appearing Before Image:

0 feet. Thanet Sand. Chalk, In this section also the threefold condition of the beds, indicative 1867.] DAWKINS LOWER BRICK-EARTHS. 97 of different circum stances of deposit, is observable. Its discrepancywith the admirable section given in 1838 by Professor Morris maybe explained by the variability of the beds in the enormous pit.The top of the Brick-earth is about 50 feet above the alluvium of theThames. ^. Erith. The second brick-pit is situated on the right-handside of the road from Erith to Crayford, immediately after it hascrossed the North Kent Railway, and about one mile from that atCrayford. It is peculiarly interesting as affording a section fromthe top of the Woolwich beds down to the Chalk, as weU as provingthat the Brick-earth rests on the edges of the Eocene strata, and ina hollow excavated in the Chalk. In the diagram (fig. 4) I have notattempted to give the horizontal distribution of the strata, but merelythe vertical thickness. Fig. 4.—Section at Whitens Pit, Erith.

 

Text Appearing After Image:

Vertical scale ^ in. to a foot. Horizontal extent not represented. a. Chalk with flints, b. Thanet Sand, with a layer of tabular flints at the base.c. Woolwich sand. d. Stiff black clay. e. Lenticular mass of shells./. Bed of black Eocene flints, with quartz pebbles, g. Surface-soil. At the base both of the Eocene beds and of the Brick-earths lies theChalk with flints, nearly horizontal, and quarried to a depth of morethan 100 feet (a of section A). Above this is the Thanet Sand withthe usual layer of tabular flints-at its base (h of the same section),and with a dip of 10° to the IS.IN.W. It is overlain by the Woolwichsand, reddish-brown in colour (c), containing a bed of stone, and inits upper part consisting of sandy and loamy layers with Septariaand many shells, on which rests conformably a stiff black clay withfew shells {d). Above this is a lenticular mass of Eocene shells,very irregular (e), capped by a bed of black Eocene flints witha few quartz pebbles (/), at the top of whic

 

 

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