Classification of Coated Grains

  • Tadeusz M. Peryt

Abstract

The term “coated grains” was coined by Wolf (1960) as a substitute for Folk’s (1959) “oolites”, “to include other concentrically formed materials such as pisolites” (Wolf 1960, p. 1415). Among the different terms proposed for specific kinds of these grains the term “ooid” has unquestionably the longest tradition in geological literature, going back to the 18th century, although the orthography as used here is of later date, Having been introduced by Kalkowsky (1908). As ooids, “small egg-like grains, resembling the roe of a fish, each of which has usually a small fragment of sand as a nucleus, around which concentric layers of calcareous matter have accumulated” (Lyell 1855, p. 12) have been named. In 1916 Heim introduced a new term: “oncoid” (in original German orthography: Onkoid; “onchos” in Greek means “nodules”), for denoting a type of coated grain found by him in Mesozoic deposits of the eastern Swiss Alps which differed from an ooid in that the coated grain called oncoid possessed (Heim 1916, p. 566): (1) non-concentric overlapping of separate envelopes, (2) not exclusively rounded form, (3) compact structure, with or without nucleus, and (4) sharp or indistinct boundaries. As noted by Heim (1916), transitions between ooids and oncoids exist, and this is expressed in encrustation of ooids by irregular calcareous envelopes.

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References

  1. Bosellini A, Ginsburg RN (1971) Form and internal structure of recent algal nodules (Rhodolites) from Bermuda. J Geol 79:669–682CrossRefGoogle Scholar
  2. Bosence DWJ (this vol.) Description and classification of rhodoliths (rhodoids, rhodolites), p. 217–224Google Scholar
  3. Catalov G (this vol.) Triassic oncoids from Central Balkanides (Bulgaria), p. 398–408Google Scholar
  4. Fabricius F (1967) Die Rät- und Lias-Oolite der nordwestlichen Kalkalpen. Geol Rundschau 56:140–170CrossRefGoogle Scholar
  5. Fabricius F (1977) Origin of marine ooids and grapestones. Contr Sedimentology 7:1–113Google Scholar
  6. Flügel E (1978) Mikrofazielle Untersuchungsmethoden von Kalken. Springer, Berlin Heidelberg New YorkGoogle Scholar
  7. Folk RL (1959) Practical petrographic classification of limestones. Amer Assoc Petrol Geol Bull 43:1–38Google Scholar
  8. Fritz GK (1958) Schwammstotzen, Tuberolithe und Schuttbrekzien im Weissen Jura der Schwäbischen Alb. Arb geol Inst TH Stuttgart, NF 13:1–118Google Scholar
  9. Füchtbauer H (1974) Sediments and sedimentary rocks. Schweizerbart, StuttgartGoogle Scholar
  10. Heim A (1916) Monographie der Churfürsten-Mattstock-Gruppe. 3. Lithogenesis. Beitr Geol Karte Schweiz, NF 20:369–662Google Scholar
  11. Kalkowsky E (1908) Oolith and Stromatolith im norddeutschen Buntsandstein. Z dt geol Ges 60:68–125Google Scholar
  12. Leighton MW, Pendexter C (1962) Carbonate rock types. Amer Assoc Petrol Geol Mem 1:33–61Google Scholar
  13. Lyell Ch (1855) A manual of elementary geology. 5th edition, LondonGoogle Scholar
  14. Matyja BA (1978) Struktury wczesnodiagenetyczne w wapiennych utworach oksfordu. Prz geol 26:156–158Google Scholar
  15. Peryt TM (1977) Environmental significance of foraminiferal-algal oncolites. In: Flügel E (ed) Fossil Algae. Springer, Berlin Heidelberg New York, p. 61–65Google Scholar
  16. Peryt TM (1981) Phanerozoic oncoids — an overview. Facies 4:197–214CrossRefGoogle Scholar
  17. Peryt TM (this vol.) Vadoids, p. 437–449Google Scholar
  18. Pia J (1927) Thallophyta. In: Hirmer M (ed) Handbuch der Paläobotanik, 1:31–136. Oldenbourg, München BerlinGoogle Scholar
  19. Purser BH (1980) Sédimentation et diagenèse des carbonates néritiques récents. Editions Technip, ParisGoogle Scholar
  20. Radwański A (1968) Studium petrografiezne i sedymentologiczne retyku wierchowego Tatr. Studia Geol Polonica 25:1–146Google Scholar
  21. Richter DK (this vol.) Calcareous ooids: A synopsis, p. 71–99Google Scholar
  22. Riding R (this vol.) Cyanoliths (cyanoids): oncoids formed by calcified cyanophytes, p. 276–283Google Scholar
  23. Semikhatov MA, Gebelein CD, Cloud P, Awramik SM, Benmore WC (1979) Stromatolite morphogenesis — progress and problems. Can J Earth Sci 16:992–1015CrossRefGoogle Scholar
  24. Schuler G (1968) Lithofazielle, sedimentologische und paläogeographische Untersuchungen in der Raibler Schichten zwischen Inn und Salzach (Nördliche Kalkalpen). Erlanger geol Abh 71:1–60Google Scholar
  25. Wolf KH (1960) Simplified limestone classification. Amer Assoc Petrol Geol Bull 44:1414–1416Google Scholar
  26. Wolf KH (1965) Gradational sedimentary products of calcareous algae. Sedimentology 5:1–37CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1983

Authors and Affiliations

  • Tadeusz M. Peryt
    • 1
  1. 1.Instytut GeologicznyWarszawaPoland

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