Marls are calcium carbonate or lime rich muds or mudstones which contain variable amounts of clays and calcite or aragonite. The term is most often used to describe lacustrine (lake) sediments, but is also used for marine deposits. The term marl is widely used in North American geology, while the term seekreide is used in European references. Supplementary data page Structure and properties n, εr, etc. ... Mudstone is a fine-grained sedimentary rock whose original constituents were clays or muds. ... Quaternary clay in Estonia. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... Aragonite Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. ... Lacustrine is derived from the Latin word lacus, which means lake. ... Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ...

The lower stratigraphic units of the chalk cliffs of Dover consist of a sequence of glauconitic marl followed by rythmically banded limestone and marl layers. Similar upper Cretaceous cyclic sequences in Germany have been correlated with Milankovitch orbital forcing. Stratigraphy, a branch of geology, is basically the study of rock layers and layering (stratification). ... The Needles, part of the extensive Southern England Chalk Formation Chalk is a soft, white, porous form of limestone composed of the mineral calcite. ... The white cliffs of Dover The white cliffs of Dover, immortalized in popular song and verse (by Vera Lynn, Kate Smith, Matthew Arnold, Eric Johnson and others), are cliffs facing the Strait of Dover near the major English port town of Dover, in the county of Kent, and form part... Glauconite is a phyllosilicate (mica group) mineral of formula: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2. ... Limey shale overlaid by limestone. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch of the Tertiary period (65. ... This article or section should be merged with Orbital forcing Milankovitch cycles is the name given to the collective effect of changes in the Earths movements upon its climate. ...

Marl 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. What is a glacial lake? A glacial lake is a lake that origins from a melted glacier. ... Wiktionary has a definition of: Bog Virgin boreal acid bogs at Browns Lake Bog, Ohio A bog is a wetland type that accumulates peat, a deposit of dead plant material. ...

Marl is also a short form for the name Marlene

References

• Schurrenberger, D., Russell, J. and Kerry Kelts. 2003. Classification of lacustrine sediments based on sedimentary components. Journal of Paleolimnology 29: 141-154.
• Chalk of Kent by C. S. Harris Accessed 11/06/2005
• Geochemistry and time-series analyses of orbitally forced Upper Cretaceous marl–limestone rhythmites, abstract Accessed 11/06/2005
• Palaeoenvironmental Interpretation of the Early Postglacial Sedimentary Record of a Marl Lake Accessed 11/06/2005

See also

• Agricultural lime