Foraminifera


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Fo·ram·i·nif·e·ra

(fō-ram'i-nif'ĕr-ă, for'ă-mi-nif'er-ă),
A subclass of Rhizopoda possessing anastomosing pseudopodia; these form a network around the cell that usually develops into a complex calcareous shell; an important component of the ocean bottom and of rockbeds overlying oil deposits.
[L. foramen, aperture, + fero, to carry]

Foraminifera

amoeboid PROTOZOANS that possess chitinous, calcareous or siliceous shells that are usually many-chambered. Calcareous Foraminifera are the main constituent of chalk.
References in periodicals archive ?
Though the earliest reports of rich and abundant occurrences of planktonic foraminifera in the Parh Limestone date back to mid-twentieth century (Williams, 1959; Gigon, 1962), but later only few studies of biostratigraphic significance have been conducted (Jones, 1961; Smewing et al., 2002; Kazmi, 1988).
Through these analyzes will allow recognizing the sectors where there is the highest preservation of foraminifera tests, thus delimiting priority areas for the paleoenvironmental studies.
The foraminifera and palynomorphs recovered from the Djega outcrop represent three categories: (i) restricted Late Cretaceous forms known not to have ranged any younger than the Maastrichtian, (ii) long ranging forms, commonly the palynomorphs that crossed the Cretaceous-Tertiary boundary, and (iii) those forms that have been recorded to have appeared for the first time only during the Paleocene and in younger strata.
Unlike the groundmass, calcite strongly dominates in the grains > 5 [micro]m--skeletal debris, and foraminifera shells sometimes reach the size of 1-2 mm.
The marly deposits of the Ezkaba Formation are rich in fossils of planktic foraminifera. Among them Orbulinoides beckmanni, the index species that defines the biozone E12, was identified for the first time in the Pyrenean Domain (Payros et al., 1997).
According Ballesteros and Parra (2012), it represents a transition interval, which is characterized by the intercalation of laminated dark grey phosphatic and calcerous shales with foraminifera and thin layers of limestones, although the upper part consists of a monotonous sequence of laminated shales and calcareous mudstones.
Key words: Early Eocene, Sakesar Limestone, larger benthic foraminifera, Shallow water, Salt Range.
Previous studies show that the formation is rich in benthic foraminifera [3].
There are 6705 morphospecies of extant foraminifera, according to the latest edition of the World Register of Marine Species (WoRMS Editorial Board, 2014).
This microfacies is highly diverse in larger benthic foraminifera with perforate wall such as Neorotalia viennotti, Ammonia beccari, A.