crystals


Classification: ntax_non_cocco -> Crystals and crud -> Inorganic -> crystals
Sister taxa: crystals, star-shaped

Distinguishing features: Inorganic crystals

Taxonomy:

Citation: Inorganic crystals
Rank: Genus
Synonyms: Possible examples of inorganic crystals described as nannofossils.
Taxonomic discussion: Inorganic crystals resembling nannofossils can occur in nannofossil (and coccolithophore) preps as a result of other inclusion of diagenetic crystals in samples or precipitation of minerals during preparation. They can sometimes be mistaken for nannofossils and have occasionally been described as new species.

Catalog entries: Bucculinus * , Bucculinus algeriensis * , Bucculinus hirsutus * , Fibrillinus * , Fusellinus * , Fusellinus insolitus * , Nannoturba * , Nannoturba robusta * , Nannoturba spinosa * , Neoangulolithina * , Neoangulolithina qasimii * , Palamygdalithus * , Palamygdalithus noelae * , Pyrobolella * , Pyrobolella bradfieldii * , Pyxolithus * , Pyxolithus problematicus * , Tetralithus * , Tetralithus cassianus * , Tetralithus isoplexiros * , Tetralithus pseudotrifidus * , Tetralithus pyramidus *

Distinguishing features: Inorganic crystals


Morphology: Determining whether simple nannolith-like forms are biogenic fossils or abiogenic crystals is a long-standing problem for nannofossil palaeontology. Indeed Ehrenberg initially thought discoasters and simple coccoliths were inorganic and described them as "Crystalldrusen" and calcareous "morpholithe" (Siesser 1984). Likewise fossil Florisphaera profunda liths were only recognised as fossils after study of the living organism.  A few criteria which can be applied include:
For example the kite-shaped nannofossil Minylitha convallis is not obviously biogenic but well-preserved speciemens show additional morphological complexity - with a distinct rim, they have a conistent size and only occur within a short interval in the Late Miocene.

Geological Range:
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source:

References:

Black, M. (1971b). Problematical Microfossils from the Gault Clay. Geological Magazine. 108(4): 325-327. gs

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Deflandre, G. (1970). Présence de nannofossiles calcaires (coccolithes et incertae sedis) dans le Siluro-dévonien d'Afrique du Nord. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris. 270: 2916-2921. gs

Gardet, M. (1955). Contribution à l'étude des coccolithes des terrains néogènes de l'Algérie. Publications du Service de la Carte Géologique de l'Algérie (Nouvelle Série). 5: 477-550. gs

Guptha, M. V. S. (1979). New genus and new species of coccoliths in a deep sea sediment core from South Eastern Arabian Sea. In, unknown (ed.) 4th International Palynological Conference, Lucknow. 115-116. gs

Jafar, A. S. (1983). Significance of Late Triassic calcareous nannoplankton from Austria and Southern Germany. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 166: 218-259. gs

Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs

Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997a). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43(281-302): -. gs

Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs V O

Noël, D. (1957). Coccolithes des terrains Jurassiques de l'Algérie. Publications du Service de la Carte Géologique de l'Algérie (Nouvelle Série) Bulletin. 8: 303-385. gs

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V O

Siesser, W. G. (1994). Historical background of coccolithophore studies. In, Winter, A. & Siesser, W. G. (eds) Coccolithophores. Cambridge University Press, Cambridge 1-11. gs

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs V O

Zanin, Y. N., Zamirailova, A. G. & Eder, V. G (2012). Some Calcareous Nannofossils from the Upper Jurassic-Lower Cretaceous Bazhenov Formation of the West Siberian Marine Basin, Russia. The Open Geology Journal. 6: 25-31. gs


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crystals compiled by Jeremy R. Young viewed: 12-5-2021

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