Marl
Lime-rich mud or mudstone which contains variable amounts of clays and silt / From Wikipedia, the free encyclopedia
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For other uses, see Marl (disambiguation).
Not to be confused with Maerl.
Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae.
Marl makes up the lower part of the cliffs of Dover, and the Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post-glacial lakes, such as the marl ponds of the northeastern United States.
Marl has been used as a soil conditioner and neutralizing agent for acid soil and in the manufacture of cement.