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Excerpt from A Geological Inquiry Respecting the Water-Bearing Strata of the Country Around London, With Reference Especially to the Water-Supply of the Metropolis: And Including Some Remarks on Springs
There is thus a belt of variable width of Lower Greensand encircling a barren area of Palaeozoic rocks, of which latter London is the centre, and having a diameter of some 20 miles with a depth from the surface of from 850 to 1450 feet.
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