Everything about The Dunham Classification totally explained
The
Dunham classification system for
carbonate sedimentary rocks was devised by
Kingsley Charles 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.
Contains less than 10% grains (usually assessed by
area in cut or
thin section), supported by a
lime mud.
Consists of more than 10% grains, supported by a lime mud.
Consists of more than 10% large grains (>2
mm), supported by a lime mud.
Contains lime mud, but is grain supported.
Coarse
limestones supported by grains larger then 2 mm.
Lacks mud, and is grain supported.
Describes sediment where the original components have been bound together after deposition.
Organisms 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.
Organisms (such as
algæ) encrust the elements during deposition and bind them together.
A
solid calcareous or
siliceous framework is maintained by an organism such as a
coral or
sponge.
Does not have recognisable depositional structures.
Further Information
Get more info on 'Dunham Classification'.
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