Nummulites


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Related to Nummulites: Nummulitidae

Nummulites

[′nəm·yə‚līts]
(invertebrate zoology)
A genus of unicellular shelled protozoa of the order Foraminiferida (superfamily Nummulitacea, family Nummulitidae). The discoidal, lenticular, or globular test or shell can reach a diameter of about 5 inches (12 centimeters) and is composed of finely perforate calcium carbonate, it consists of planispirally enrolled whorls of many tiny undivided chambers.

Nummulites

 

a genus of extinct unicellular organisms of the subclass Foraminifera. Remains of Nummulites have been found in Upper Cretaceous and in Paleogene deposits in the tropics and subtropics of Europe, Asia, Africa, and America. Nummulites had a lenticular or discoid shell with a diameter that ranged from 1 to 16 cm. The shell contains many whorls divided by septa into chambers; each new whorl completely overlaps the next older whorl. Nummulites led a benthopelagic mode of life. Aggregates of their shells formed nummulitic limestone, which is used as a building material. Nummulites are important index fossils in the stratigraphy of the Paleogene.

REFERENCE

Osnovy paleontologii: obshchaia chast’: prosteishie. Moscow, 1959.
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References in periodicals archive ?
JC2: Operculina/(small) Nummulites pelloidal packstone:
The assemblage of Operculina and Nummulites indicates the deposition in the deep water condition (Moallemi and Khatibimehr, 2010).
Open marine and Nummulites bank facies belt come next regarding their abundance.
The presence of abundant Nummulites with distinct orientation in JB1, large size and autochthonous of Nummulites, well sorted Nummulites tests, and grain supported texture indicate the deposition in the Nummulites Bank in the mid part of the ramp, below faiweather wave base.
The open marine environment starts with Nummulites bank.
3 faces belt have been identified including lagoon (JA), Nummulites Bank (JB) and open marine (JC).
Lithostratigraphy, microfacies investigation and paleoenvironmental reconstruction of the Jahrum Formation in the west and north of the Bandar Abbass area, South Iran

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