- Northampton sand
The Northampton sand, sometimes called the Northamptonshire sand is a geological formation found in the
East Midlandsof England. Particularly in the twentieth century, it has been of economic importance as a source of iron ore, but is now worked much less.
The formation constitutes the lowest part of the
Inferior Oolite Seriesand lies on the upper Lias clay. It attains a maximum thickness of up to 21 metres to the north and west of Northamptonwhere it lies in a subterranean basin. In the south, it fades out around Towcester. Northward from the edge of the basin in the upper Lias, under Northampton, it lies progressively lower beneath the JurassicLincolnshire limestones. A little to the north of Corby Glen(TF0027) it is at about 50 metres from the surface. It fades out under north Lincolnshireas the strata rise towards the Market Weighton Axis. Fossils found in it indicate that it dates from the early Bajocian(beginning 171.6 million years ago) and formed in an extensive, shallow sea to the north-west of the London-Brabant Island.
There is a description of the twentieth century exploitation of the Northampton sand for iron-smelting in the Wellingborough article.
*Kent, P. & Gaunt, G.D. "British Regional Geology Eastern England to The Wash" (1980) ISBN 0-11-884121-1
*Hains, B.A. & Horton, A. "British Regional Geology Central England" (1969) ISBN 0-11-880088-4
*British Geological Survey "1:50 000 Series. Stamford. Sheet 157" Solid & Drift Edition (1978)
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