Marl
Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, it becomes marlstone. It is created in marine or freshwater environments. Usually it is found through the activities of algae.
Marl makes up the lower part of the cliffs of Dover. The Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post-glacial lakes. An example of this would be the marl ponds of the northeastern United States.
Marl Media
Piece of marl
Scala dei Turchi coastal marl formation, southern Sicily
Scheme of the transitional lithotypes from mud (or mudstone) to lime (or limestone), illustrating the definition of marl (marlstone) as a mix of calcium carbonate and clay
Geological profile along the Channel Tunnel as constructed. For most of its length the tunnel bores through a chalk marl stratum (layer)
Deposition from a Marl lake inside a sheltered paint can, taken from Siseebakwet Lake
