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Packstone
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(File:DunhamPackstone.jpg|thumb|A Packstone: grain supported by small grains (width of picture is 7mm))Under the Dunham classification (Dunham, 1962Dunham, R.J. (1962) Classification of carbonate rocks according to depositional texture. In: Classification of Carbonate Rocks (Ed. W.E. Ham), Am. Assoc. Pet. Geol. Mem., 1, 108–121.) system of limestones, a packstone is defined as a grain-supported carbonate rock that contains 1% or more mud-grade fraction. This definition has been clarified by Lokier and Al Junaibi (2016)JOURNAL, Lokier, Stephen W., Al Junaibi, Mariam, 2016-12-01, The petrographic description of carbonate facies: are we all speaking the same language?, Sedimentology, en, 63, 7, 1843–1885, 10.1111/sed.12293, 1365-3091, as a carbonate-dominated lithology containing carbonate mud (2 mm.

The identification of packstone

(File:4 x2 PPL.jpg|thumb|Thin section photomicrograph of peloid packstone with fragmented bioclasts.)A study of the adoption and use of carbonate classification systems by Lokier and Al Junaibi (2016) identified three common problems encountered when describing a packstone:
  • Failure to identify the fabric as supported by the sand grade grain-size fraction - resulting in misidentification as wackestone.
  • Packstones with very small volumes of carbonate mud may be misclassified as grainstone.
  • Incorrectly estimating the volume of the component grains >2 mm.

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