Millstone girt
| (Geol.) | a hard and coarse, gritty sandstone, dividing the Carboniferous from the Subcarboniferous strata. See Farewell rock, under Farewell, a., and Chart of Geology. |
See also: Millstone
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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