assemblage zone

assemblage zone

[ə′sem·blij ‚zōn]
(paleontology)
A biotstratigraphic unit defined and identified by a group of associated fossils rather than by a single index fossil.
References in periodicals archive ?
In this study, nineteen genera and twelve species of benthic foraminifera, one genus of planktic foraminifera, three genera and four species of calcareous algae and Lingulogavelinella arnagerensis assemblage zone were identified.
This assemblage corresponds to the Eulepidina-Nephrolepidina-Nummulites Assemblage Zone (3) of [1].
The fossils are from rocks forming the Pristerognathus Assemblage Zone of the Beaufort Group in South Africa.
One pollen and spore assemblage zone A was determined from the samples from Lake Al-Hijaneh (Fig.
The high resolution of dates reveals a [sup.14]C age plateau at 10000 yr BP, spanning the upper third of the Younger Dryas pollen assemblage zone III and the lower half of the Preboreal pollen assemblage zone IV.
Based on these species, a single planktonic foraminiferal biozone has been reported named as Globotruncana-Globotruncanita-Hetrohelix Assemblage Zone of the Maastrichtian age.
The abundance of Miliolinaindicates shallow high energy open shelf environment slightly hypersaline water high energy near shore occurring forms e.g.Miliolides and representative genera Discorbisand EpistominellaLe Calvez [18].This assemblage zone indicate shallow (0-35 m.) slightly hypersaline marine condition with 36-40% salinity.
Five biozones has recognized from benthic foraminifera including four Acme zones and one Assemblage zone. According to genesis, species and biozonation, age of Maroosk and Someah e Pain is Eocene and Late Paleocene- Middle Eocene, respectively.
According to fossil assemblage above, "Omphalocyclus-Loftusia assemblage zone" biozone, was offered for Tarbur Formation in this section which indicated midlle to late Maastrichtian age for this formation's sediments.
Lepidocyclina (Eulepidina) dilitata-Operculina complanata Assemblage Zone