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It is a shale-hosted flint, passing northward into marine shale and southward into marine clay ironstone .
Twenty thousand pounds in investment money had produced twelve tons of sugar; the soils were mainly ironstone and gravel entirely unsuitable for the growth of cane or anything else.
For those who would visualize Adobe Walls as a hardscrabble place, it should be noted that the restaurant run by Mrs. Olds served its food on imported white English ironstone dishes.
Keith tells Richard how the limestone of Wenlock Edge was a key factor in the Industrial Revolution because it was used to extract iron from the ironstone .
A syngenetic origin of sulphides was suggested by early workers, mainly based on the stratiform and stratabound occurrence of the sulphides in ironstone .
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