Bituminous slate


  • Webster's Revised Unabridged Dictionary
    • Bituminous slate (Min) a soft species of sectile clay slate, impregnated with bitumen.
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In literature:

It has limestone, slate, iron ore, bituminous coal and other deposits.
"Lippincott's Magazine of Popular Literature and Science" by Various
This coal is of an inferior quality, bituminous, and largely mixed with slate.
"The Atlantic Monthly, Volume 15, No. 90, April, 1865" by Various
The cliffs at our encampment consisted of slate-clay, and bituminous alum-slate, and were six hundred feet high.
"Narrative of a Second Expedition to the Shores of the Polar Sea" by John Franklin
The Jurassic limestones and marls contain asphalte and bituminous slate.
"Spain" by Wentworth Webster