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Cliff limestone

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Cliff limestone \Cliff" lime"stone`\ (Geol.)
   A series of limestone strata found in Ohio and farther west,
   presenting bluffs along the rivers and valleys, formerly
   supposed to be of one formation, but now known to be partly
   Silurian and partly Devonian.
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