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Text File  |  1992-09-03  |  304b  |  8 lines
  1. Crumbling sedimentary rock, sometimes called
  2. clayey limestone, including various types of
  3. calcareous clays and argillaceous limestones.
  4. Marls are often laid down in freshwater lakes
  5. and are usually soft, earthy, and of a white,
  6. grey, or brownish colour. They are used in
  7. cement-making and as fertilizer.
  8.