scoria

• “From the observatory, where His Majesty's faithful servant still remains, come telegrams that the great pebbles -- what we call scoria -- have ruined”

  Aunt Jane's Nieces Abroad

• “Porcellanite (also called scoria or clinker) forms from the natural burning of coal beds; it caps the hills with distinctive red-orange rock.”

  Ecoregions of Wyoming (EPA)

• “There are tracts of these which are in part or wholly of volcanic origin; then the hills are called scoria buttes.”

  V. The Black-Tail Deer

• “The eruption opened a 2,000ft fissure, and also produced lava fountains that built several hills of bubble-filled lava rocks, called scoria, along the vent.”

  Signs of the Times

• “But I was on a bladed road which the gas companies have recently covered with what they call "scoria".”

  grouse Diary Entry

• “No, what the gas companies call "scoria" is basically crushed rock that is not crushed as fine as gravel.”

  grouse Diary Entry

• “In the majority of cases the lavas consist of a mass of crystals floating in a liquid magma, and the distension of such a mass by the escape of steam from its midst gives rise to the formation of the rough cindery-looking material to which the name of "scoria" is applied.”

  The San Francisco calamity by earthquake and fire

• “Eroded buttes, Hell Creek badlands, scoria (burnt coal) mounds, and salt pans punctuate a thick mat of shortgrass prairie and dusky gray sagebrush.”

  Ecoregions of North Dakota and South Dakota (EPA)

• “It was a shield volcano of thin basaltic flows interleaved with ash and scoria overlaid in places by later volcanic domes, plugs and dykes.”

  Gough Island Wildlife Reserve, United Kingdom

• “The interstratified basalt lava, scoria and pyroclastic rocks yield sand, clayey soils in depressions, on plains and on outward draining slopes and a sterile cemented hardpan surface where hydrated.”

  Islands and Protected Areas of the Gulf of California, Mexico

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