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 ?
Herpetocypris reptans is present in small amounts in all sequences studied, being limited to short intervals within the lake marl section (Figs 4.6).
Then came more connections: Lorri Carter, wife of Oklahoma Marl, had gone to the same elementary school in tiny El Rio, Calif., as Oregon Marl.
After a short period the isotope values drop sharply and remain practically constant up to the top of the marl sequence (c.
Occurrence: Infrequent in marl, silt, and outwash between the depths of 100-165 cm.
VESTOSINT is a modified PA12 powder that is manufactured at the Marl site from a polyamide granulate, using a proprietary Evonik process.
Justin added: "Once the heavy machines have done their work, a rich diversity of fen plants will return to Cae Gwyn's marl and peat habitat, including the internationally rare black bog rush and the orchids and dragonflies that love these conditions.
Under this contract Marl International will supply status indicator LEDs for cellular base stations for the European and Chinese markets.
In Marl, a new canal bridge for rail transportation was inaugurated, a warehouse for hazardous materials was opened and a new coal conveyor was put into operation.
Fixtures: Rumney v Grange Catholics at Riverside Park; Grange Quins v St Peters at The Marl.
The finder of the fossil was the partnership's own Ken Bradshaw, who said: "These marl slate rocks frequently show up mackerel type fossils and sections of fish and sometimes ferns and plant material.
Cllr Mike Priestley, a fellow Marl representative, said: "We got a little bit of feedback about the national picture but Sue genuinely listened to people about issues like potholes, traffic calming, anti-social behaviour and policing."
Maine navy classic short-sleeved shirt, pounds 25; Osbourne lilac poplin shirt, pounds 40, textured lilac tie, pounds 35, and plain front ultimate trousers, pounds 25; O-Z by Ozwald Boeteng blue design tie, pounds 35, blue shirt, pounds 35, navy panama jacket, pounds 165, and navy panama trousers, pounds 65; O-Z marl panama jacket, pounds 165, end on end shirt, pounds 40, tie, pounds 35, and marl panama trousers, pounds 65.