| Northampton Sand |
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| geology of england | |
| geography of northamptonshire | |
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The formation constitutes the lowest part of the Inferior Oolite Series and lies on the Upper Lias clay. It attains a maximum thickness of up to 21 metres to the north and west of Northampton where 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 Jurassic Lincolnshire limestones. A little to the north of Corby Glen (TF0027) it is at about 50 metres from the surface. It fades out under north Lincolnshire as the strata rise towards the Market Weighton Axis . Fossil s 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 . COMMERCIAL EXPLOITATION There is a description of the Twentieth Century exploitation of the Northampton sand for iron-smelting in the Wellingborough article. REFERENCES
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