Sentence Examples

  • The gold-quartz veins are mainly in the Ordovician and Silurian rocks; but some also occur in the Devonian, and there are impregnations of gold in tufas of Devonian age.
  • The various decomposing volcanic rocks - tufas, conglomerates and basalts - mingled with decayed vegetable matter, and abundantly watered, form a very fertile soil.

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