Folk classification


Folk classification

The Folk classification, devised by R. L. Folk in 1959, is a technical descriptive classification of calcareous sedimentary rocks. It details the relative proportions of allochems in the rock and the type of matrix. The classification scheme covers most common carbonate rocks, however the more inclusive although less precise alternative, Dunham classification, may be preferred in some instances.

Applying Folk Classification

Folk classification consists of one or two prefixes followed by a suffix.

uffixes

The suffix "-sparite" is used if the rock has a crystalline matrix, and "-micrite" if it contains a micritic, or mud-based, matrix.

Prefixes

The prefix describing the main (non-matrix) component of the rock immediately precedes the suffix, a second prefix describing a second important component may be tagged on to the front of this.

Common Prefixes

"oo-"

Used to denote the presence of ooids

"bio-"

Used to describe biogenetic remnants - for example, shells, echinoiderm ossicles or other tests

"pel-"

Describes the presence of peloids (fossilised droppings). May also be used to describe any pellet under 2 mm in diameter (as peloids are often hard to distinguish from intraclasts after diagenesis)

"intra-"

Denotes the presence of intraclasts, for example quartz grains or carbonate clasts eroded from the surrounding rocks.

Example

A rock consisting mainly of ooids with some shelly fragments, with a crystalline matrix, would be termed a biooosparite.

References

*Folk, R.L., 1959, "Practical petrographic classification of limestones:" American Association of Petroleum Geologists Bulletin, v. 43, p. 1-38.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Folk taxonomy — A folk taxonomy is a vernacular naming system, and can be contrasted with scientific taxonomy. Folk biological classification is the way rural or indigenous peoples make sense of and organize their natural surroundings/the world around them,… …   Wikipedia

  • Classification De Folk — La classification de Folk concerne les roches carbonatées (ou calcaires), il essaie de nommer ces roches en observant différentes caractéristiques: Il existe une autre classification pour ces calcaires: la classification de Dunham La… …   Wikipédia en Français

  • Classification de folk — La classification de Folk concerne les roches carbonatées (ou calcaires), il essaie de nommer ces roches en observant différentes caractéristiques: Il existe une autre classification pour ces calcaires: la classification de Dunham La… …   Wikipédia en Français

  • Folk music — Folk song redirects here. For other uses, see Folk song (disambiguation). Folk music Béla Bartók recording Slovak peasant singers in 1908 Traditions List of folk music traditions …   Wikipedia

  • folk dance — folk dancer. folk dancing. 1. a dance that originated among, and has been transmitted through, the common people. Cf. court dance. 2. a piece of music for such a dance. [1905 10] * * * Dance that has developed without a choreographer and that… …   Universalium

  • Folk biology — or folkbiology is the cognitive study of how people classifyand reason about the organic world. Humans everywhere classify animals and plants into obvious species like groups. The relationship between a folk taxonomy and a scientific… …   Wikipedia

  • folk literature — Introduction also called  folklore  or  oral tradition        the lore (traditional knowledge and beliefs) of cultures having no written language. It is transmitted by word of mouth and consists, as does written literature, of both prose and… …   Universalium

  • Classification Musicale — Musique Allégorie évoquant la musique et les instruments La musique est l art consistant à arranger et ordonner sons et silences au cours du temps : le rythme est le support de cette combinaison dans le temps, la hauteur celle de la… …   Wikipédia en Français

  • Classification musicale — Musique Allégorie évoquant la musique et les instruments La musique est l art consistant à arranger et ordonner sons et silences au cours du temps : le rythme est le support de cette combinaison dans le temps, la hauteur celle de la… …   Wikipédia en Français

  • Folk — Musique folk La musique folk désigne trois genres musicaux proches, mais distincts : La folk music désignait d abord dans les pays où la langue anglaise domine (États Unis, Angleterre, Irlande, Écosse, Canada), la musique populaire… …   Wikipédia en Français


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.