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- Marl abstract "Marl or marlstone is a calcium carbonate or lime-rich mud or mudstone which contains variable amounts of clays and silt. The dominant carbonate mineral in most marls is calcite, but other carbonate minerals such as aragonite, dolomite, and siderite may be present. Marl was originally an old term loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under freshwater conditions; specifically an earthy substance containing 35–65% clay and 65–35% carbonate. It also describes a habit of coralline red alga. The term is today often used to describe indurated marine deposits and lacustrine (lake) sediments which more accurately should be named marlstone. Marlstone is an indurated rock of about the same composition as marl, more correctly called an earthy or impure argillaceous limestone. It has a blocky subconchoidal fracture, and is less fissile than shale. The term marl is widely used in English-language geology, while the terms Mergel and Seekreide (German for "lake chalk") are used in European references.The lower stratigraphic units of the chalk cliffs of Dover consist of a sequence of glauconitic marls followed by rhythmically banded limestone and marl layers. Upper Cretaceous cyclic sequences in Germany and marl–opal-rich Tortonian-Messinian strata in the Sorbas basin related to multiple sea drawdown have been correlated with Milankovitch orbital forcing.Marl as lacustrine sediment is common in post-glacial lake bed sediments, often found underlying peat bogs. It has been utilized as a soil conditioner and acid soil neutralizing agent.MarlAncient term used to describe human waste. Remote areas of sunken ground were used as a dumping ground and designated as 'marl pits'.".
- Marl thumbnail Scala_dei_Turchi_panorama.jpg?width=300.
- Marl wikiPageExternalLink 31.
- Marl wikiPageExternalLink chalk1.htm.
- Marl wikiPageExternalLink 782.pdf.
- Marl wikiPageID "46196".
- Marl wikiPageRevisionID "602382460".
- Marl hasPhotoCollection Marl.
- Marl subject Category:Limestone.
- Marl subject Category:Sedimentary_rocks.
- Marl comment "Marl or marlstone is a calcium carbonate or lime-rich mud or mudstone which contains variable amounts of clays and silt. The dominant carbonate mineral in most marls is calcite, but other carbonate minerals such as aragonite, dolomite, and siderite may be present.".
- Marl label "Marga".
- Marl label "Marga".
- Marl label "Margiel".
- Marl label "Marl".
- Marl label "Marna (roccia)".
- Marl label "Marne (géologie)".
- Marl label "Mergel (sedimentologie)".
- Marl label "Mergel".
- Marl label "Мергель".
- Marl sameAs Slín.
- Marl sameAs Mergel.
- Marl sameAs Marga.
- Marl sameAs Tupa.
- Marl sameAs Marne_(géologie).
- Marl sameAs Napal.
- Marl sameAs Marna_(roccia).
- Marl sameAs 이회암.
- Marl sameAs Mergel_(sedimentologie).
- Marl sameAs Margiel.
- Marl sameAs Marga.
- Marl sameAs m.0cj09.
- Marl sameAs Q184053.
- Marl sameAs Q184053.
- Marl wasDerivedFrom Marl?oldid=602382460.
- Marl depiction Scala_dei_Turchi_panorama.jpg.
- Marl isPrimaryTopicOf Marl.
