Ironstones sentence example

ironstones
  • The Coal Measures, forming the third great member of the Carboniferous series, consist of alternations of shales and sandstones, with beds of coal and nodular ironstones, which together make up a thickness of many thousands of feet - from 12,000 to 14,000 ft.

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  • Cannel coals are generally variable in quality, being liable to change into shales or black-band ironstones within very short horizontal limits.

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  • As the impurities increase in amount the clay rocks pass gradually into argillaceous sands and sandstones, argillaceous limestones and dolomites, shaly coals and clay ironstones.

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