Carbonate classification

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Figure 1 Folk[1] and Dunham[2] classifications.

The two commonest classification systems for carbonate rocks are those of Folk[1] and Dunham.[2] Folk's classification uses combination forms of words describing the grains and words describing the cements. Dunham's classification is based on the depositional fabric of the rock.


  1. 1.0 1.1 Folk, R. L., 1959, Practical petrographic classification of limestones: AAPG Bulletin, v. 43, p. 1–38.
  2. 2.0 2.1 Dunham, R. J., 1962, Classification of carbonate rocks according to depositional texture, in Ham, W. E., ed., Classification of Carbonate Rocks: AAPG Memoir 1, p. 108–121.

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