American Heritage® Dictionary of the English Language, Fourth Edition
- n. Geology A stratigraphic unit equivalent to the Pennsylvanian or Upper Carboniferous Periods.
- n. Geology Strata of the Carboniferous Period usually containing coal deposits.
Century Dictionary and Cyclopedia
- In geology, that portion of the Carboniferous series in which beds of coal are found. The coal-measures are sometimes several thousand feet in thickness, and consist, in addition to the coal itself, of many beds of clay, shale, and sandstone. See
- In America and Great Britain a special significance attaches to this term in geological classification. In Pennsylvania the coal-measures are those strata which carry the productive coal-beds of Carboniferous age and all deposits intercalated between them, and they are divided into lower productive, lower barren, and upper productive measures. The coal-measures, with the millstone-grit at their base, constitute the upper division of the Carboniferous system. In Great Britain and on the Continent their relations are similar.
GNU Webster's 1913
- n. (Geol.) A subdivision of the carboniferous formation, between the millstone grit below and the Permian formation above, and including nearly all the workable coal beds of the world.
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