Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A rock containing clay materials and calcium and magnesium carbonates, with approximately the same composition as marl.
Century Dictionary and Cyclopedia
- n. In geology, argillaceous and more or less ferruginous limestone. The middle of the three principal divisions of the Lias in England is called the Marlstone, a name first used by W. Smith. This is economically a highly important rock, since it contains the celebrated deposits of iron ore called the Cleveland, from the Cleveland hills, in which it occurs. The Middle Lias or Marlstone consists generally of two members, the upper one being the Marlstone proper, and the lower a series of sands, marls, and clays. The maximum thickness of the whole series is about 300 feet.
Wiktionary
- n. geology marl
GNU Webster's 1913
- n. (Geol.) A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England.
WordNet 3.0
- n. metamorphic rock with approximately the same composition as marl
Etymologies
- marl + stone (Wiktionary)
Examples
“Yes, it's local stone, called marlstone – basically a limestone that has iron in it, I think, hence the lovely rusty colour.”
“On the left is a ruined castle, built of shelly marlstone, which, according to Arabian tradition, once belonged to the Berdovil in question.”
“When there is an upper story, which is rarely the case, it is approached from the courtyard by a staircase, usually dilapidated, with stairs of shelly marlstone.”
“Harish lies along the side of an undulating hill fronting the sea, at the foot of the large quadrangular castle, a substantial building of calcareous marlstone.”
“Belemnites are generally found in immense numbers together, especially in the marlstone quarries of the Midlands, and in the lias cliffs of Dorsetshire.”
Falling in Love With Other Essays on More Exact Branches of Science
“Mine haulage will be by rail, like the Bingham Canyon pit in Utah, and the carloads of marlstone will also moved to some place that has plenty of water, already has a petrochemical industry, and could even use the waste rock that remains after the kerogen is extracted.”
“This is clearly a place that could use fill - crushed marlstone by the cubic mile.”
“The leftover marlstone takes up about 30 percent more volume.”
“Granted, some of this energy would be need to haul the marlstone up to the Great Divide before starting down.”
“Thus a marlstone train, dropping to sea level after crossing the Rockies, could function like a big hydroelectric plant, powered by rolling rock instead of falling water.”
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