from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A rock containing clay materials and calcium and magnesium carbonates, with approximately the same composition as marl.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. marl
from the GNU version of the Collaborative International Dictionary of English
- n. A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England.
from The Century Dictionary and Cyclopedia
- n. In geology, argillaceous and more or less ferruginous limestone.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. metamorphic rock with approximately the same composition as marl
marl + stone (Wiktionary)