Marl

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Marl

(märl), city (1994 pop. 92,590), North Rhine–Westphalia, W Germany. It is an industrial and mining (coal, lead, and zinc) center, and also supports a number of chemical factories. Now a modern city, Marl was first mentioned in the 9th cent. and was chartered in 1936.

marl

or

bog lime,

soil, essentially clay mixed with carbonate of lime, highly valued as a dressing or fertilizer. It crumbles rapidly and easily. Marl in which the lime is in the form of invertebrate shells is called shell marl. The term is loosely used for a variety of soils, some of which are low in lime content, e.g., the greensand marl of New Jersey. Marling of soil tends to lighten it, correct acidity, and promote nitrification.

Marl

 

a city in the Federal Republic of Germany in the Land of North Rhine-Westphalia, in the Ruhr. Population, 77,000 (1970). Marl is an important center for the production of synthetic rubber, plastics, synthetic resins, chemical fibers, soda, and chlorine. Coal and lead and zinc ores are mined in the area.


Marl

 

a sedimentary rock composed of calcite or dolomite and clay minerals. The ratio of carbonaceous to clay components may vary. Generally marl is identified as rock containing from 30 to 90 percent CaCO3 or MgCO3 and, correspondingly, from 70 to 10 percent clay particles. There are clay, calcareous, chalky, and dolomite marls and, depending on admixtures, there are siliceous, glauconite, sandy, micaceous, bituminous, and carbonaceous marls. Color varies, most often being light. Marl is widespread in nature and is found in all systems beginning with the Proterozoic. In the USSR marl is universally developed in carbonaceous and clay strata. It is used as a raw material in the production of certain kinds of cement. Natural cement marl containing 75–80 percent CaCOa is the most important. In the USSR the most well-known deposits of cement marl are in the vicinity of Novorossiisk, Amvrosievka (Donetsk Oblast), and the village of Podgornoe (Voronezh Oblast).

Marl deposits are worked by open-cut mining. Processing is done in powerful rotary furnaces working on mixtures of different types of marl and chalk.

G. I. BUSHINSKII

marl

[märl]
(geology)
A deposit of crumbling earthy material composed principally of clay with magnesium and calcium carbonate; used as a ertilizer for lime-deficient soils. Also known as malm.
(textiles)
Two yarns of different colors or kinds twisted around each other.

marl

An earthy deposit; a mixture of clay and carbonate of lime.

marl

a fine-grained sedimentary rock consisting of clay minerals, calcite or aragonite, and silt: used as a fertilizer
References in periodicals archive ?
The mandible was at the contact of the lower marl carbonate and the basal conglomerate.
It was possible to identify >100 pollen grains in only one sample; that was from the marl unit in close association with remains of vertebrates.
When Earl returned to Sydney he put the boat up for sale and, as he recalls, Ian Kiernan was "entranced by Marls sitting in Mosman Bay.
He lacked swimming ability and I dived in and got him ashore, re-boarded Marls and rowed back with the sale agreed and the finest friend you could image, Jack Earl.
The Lincolnshire grower, who did not wish to be named, but who said he supplied Sainsbury packers Greenvale AP and QV Foods, claimed that Marls Piper potatoes were available in only 30% of Sainsbury stores.
A Sainsbury spokeswoman said Marls Piper stocks were simply making way for Vivaldi, which was now more popular.
The Marls family bought the property for $225,000 in August 2002 from VFE LLC, led by Rick Ferguson.
2000), lakes with very different size and hydrological regime, shows that some general factors determined the formation of the carbon isotope composition in the lake marls.
The aim of the present research was to study isotopes and pollen from lake marl to reconstruct the trends in the environmental changes and the rapid change of [[delta].
The outwash channel is filled with marls, mucks, and peats (Gray 1989); and these deposits are traversed by Spring Creek, which flows into the Eel River.
This is one of the most widely distributed and abundant mollusks of Holocene marls.