Nummulites


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
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.
Mentioned in ?
References in periodicals archive ?
1846): Memoire sur le terrain a Nummulites (Epicretace) des Corbieres et de la Montagne Noire.
1981): Nummulites et Assilines de la Tethys paleogene.
Fossil associations from the middle and upper Eocene strata of the Pamplona basin and surrounding areas (Navarre, western Pyrenees)
ii) Nummulites atacicus: This species was dominantly found in the lower to middle parts of the formation throughout the study area.
MICROPALAEONTOLOGICAL ANALYSIS OF THE EARLY EOCENE SAKESAR LIMESTONE, CENTRAL SALT RANGE, PAKISTAN
Nummulites, Assilina and Discocyclina are mostly present in the open shoal to the offshore part of the carbonate platform.
Microfaunal Assemblage of the Sui Main Limestone from Sui Gas Field, Pakistan
Las formas grandes de Nummulites y Pseudophragmina presentes en la microfacies 4 son paleoecologicamente un caso especial, ya que se podria tratar de formas adaptadas a un ambiente mas profundo de plataforma externa (Hallock & Glenn, 1986).
Calizas lutetianas del arco interno paleogeno de Costa Rica
Nummulites are the main allochems of this microfacies.
Lithostratigraphy, microfacies investigation and paleoenvironmental reconstruction of the Jahrum Formation in the west and north of the Bandar Abbass area, South Iran
Nummulites mamillatus (FICHTEL and MOLL) Nummulites atacicus LEYMERIE 1846
BIOSTRATIGRAPHY OF CHORGALI FORMATION, JHALAR AREA, KALA CHITTA RANGE, NORTHERN PAKISTAN
1998) Nummulites fabianii appears first in the Late Eocene (Priabonian) SBZ 19, and has been documented by various workers to range extending to SBZ 20 and there is no evidence of its occurrence in the older or younger strata (Matsumaru and Sarma, 2010; Less et al.
Biostratigraphy of the Eocene Nisai Formation in Pishin Belt, Western Pakistan
After development step in Middle Eocene, with isotopic changes in [delta]18O, decrease in temperature of Middle-Late Eocene and decrease in carbonate environments which followed by submarine volcanoes ultimately nummulites were extincted.
The extinction event of the middle to late eocene, case study: someah-E- pain area, Alborz-Azerbaijan sub provience, NW Iran
A diverse age and depth diagnostic foraminiferal fauna that characterizes the topsets of the HST includes Ranikothalia sindensis Ranikothali nuttali Miscellanea miscella Lockhartia Miscellanea stampi Operculina salsa Operculina subsalsa Discocyclina ranikotensis Discocyclina Seunesi Operculina petalensis Assilina spinosa Nummulites lahiri Nummulites thalicus Nummulites pinfoldi Alveolina vredenburgi Alveolina pasticlata Alveolina conradi and Alveolina globula (Fig.
Integrated paleoenvironmental bio- and sequence-stratigraphic analysis of the late Thanetian Lockhart Limestone in the Nammal Gorge section western Salt Range Pakistan
Nummulites et assilines de laTethys Paleogtne: taxinomie, phylogenese et biostratigraphie.
Biostratigraphy and depositional environments of the Early Eocene Margalla Hill Limestone, Kohala-Bala area, Haripur, Hazara Fold-Thrust Belt, Pakistan
Biostratigraphical investigations revealed that the limestone is host of a number of biostratigraphically important benthonic larger foraminiferal species belonging to the genera: Nummulites, Assilina, Lockhartia, Alveolina and Opercolina.
Microfacies assemblages and diagenetic framework of the Lower Eocene Sakesar limestone, Karoli area, Central Salt Range, Sub-Himalayas of Pakistan

Encyclopedia browser ?
Full browser ?