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Dunham classification

Grainstone in the Dunham Classification (Brassfield Formation near Fairborn, Ohio). Grains are crinoid fragments.
Grainstone with calcitic ooids, crinoid fragments, and sparry calcite cement; Carmel Formation, Middle Jurassic, of southern Utah, USA.
Thin section photomicrograph of a carbonate mudstone in plane polarised light.

The Dunham classification system for carbonate sedimentary rocks was originally devised by Robert J. Dunham (1924–1994)[1] in 1962,[2] and subsequently modified by Embry and Klovan in 1971[3] to include coarse-grained limestones and sediments that had been organically bound at the time of deposition. The modified Dunham Classification has subsequently become the most widely employed system for the classification of carbonate sedimentary rocks with 89%[4] of workers currently adopting this system over the alternative Folk[5] classification scheme

  1. ^ Wilson, James Lee; Lloyd, R. Michael (January 1995). "Robert J. Dunham (1924–1994)". AAPG Bulletin: 154.
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  5. ^ Cite error: The named reference Folk was invoked but never defined (see the help page).

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