Keywords: UPPER CHALK
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Journal Articles
Journal Articles
Journal Articles
Journal Articles
Minutes of the Proceedings of the Institution of Civil Engineers (1850) 9 (1850): 360–368.
Published: 31 December 1850
... by the useof these terms their relative position is merely indicated. The lower portion is, however, very generally known asthechalkmarl, or clunch,termsnotalwaysapplicable. The beds of the upper chalk alternatwe ith layers of flint, not uniform overextensive areas, butonthewhole sufficiently regular...

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