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Dunham classificationThe Dunham classification system for carbonate sedimentary rocks was devised by Dunham in 1964, and refined by Embry and Klovan in 1971 to include sediments that were organically bound during deposition. The classification is a way of describing the composition of calcareous rocks. For descriptions detailing the textural components of sediments and sedimentary rocks, the Folk classification is generally preferred - both are equally valid methods of classification with different emphases.
Additional recommended knowledge
MudstoneContains less than 10% grains (usually assessed by area in cut or thin section), supported by a lime mud. WackestoneConsists of more than 10% grains, supported by a lime mud. FloatstoneConsists of more than 10% large grains (>2 mm), supported by a lime mud. PackstoneContains lime mud, but is grain supported. RudstoneIs supported by components larger than 2 mm. GrainstoneLacks mud, and is grain supported. BoundstoneDescribes sediment where the original components have been bound together after deposition. BafflestoneOrganisms acted as baffles during deposition, reducing the local depositional energy. Will contain traces of baffling organism and smaller grains that would be expected from the palæocurrent strength. BindstoneOrganisms (such as algæ) encrust the elements during deposition and bind them together. FramestoneA solid calcareous or siliceous framework is maintained by an organism such as a coral or sponge. Crystalline CarbonateDoes not have recognisable depositional structures. References
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dunham_classification". A list of authors is available in Wikipedia. |