Problems related to the interpretation of planktonic foraminiferal biofacies are pointed for recent and ancient sediments. The relations between living fauna and . Many translated example sentences containing “foraminíferos planctónicos” – English-Spanish dictionary and search engine for English translations. Modelos de extinción de foraminíferos planctónicos en el limite Cretácico/ Terciario (K/T) de El Mulato (México) y Agost (España). Planktic Foraminifera.
|Published (Last):||20 August 2012|
|PDF File Size:||6.69 Mb|
|ePub File Size:||19.53 Mb|
|Price:||Free* [*Free Regsitration Required]|
Siderophile interelement variations in the Cretaceous-Tertiary boundary sediments from Caravaca, Spain. The wall texture of these first Eoglobigerina specimens may best be described as pitted as in Figures 10c10d and 10e rather than as cancellate.
The base of the Bagh outcrop is covered by the Lower Red Formation. The discrimination of these species is not supported by morpho- or ecostatistical analyses, therefore some of them plannctonicos be synonyms.
Initially he included the genera Eoglobigerina, Subbotina, and Globastica Blow, in this family, and considered the first two genera to be phylogenetically related, whilst the third collaterally related to Eoglobigerina. The interpretation of paleosalinity in the Roraminiferos outcrop was measured based on biota assemblages. Strontium isotopic evidence for extensive reworking in sediments spanning the Cretaceous-Tertiary boundary at ODP Site The Qom Formation crops out along the Zagros fold belt Figure 1and is mainly composed of marine planctonicow, limestone, gypsum and siliciclastics strata Reuter et al.
Lenticulina orbicularis has been identified from middle-outer neritic to above the CCD Pezelj et al. Abundance, diversity and composition of foraminifers are strongly controlled by temperature.
Ecology and classification of benthic foraminifers by cluster techniques The microfossil assemblages of the Qom Formation have been described by many authors based on large benthic foraminifer distribution Schuster and Wielandt, ; Abaie et al. Romanian Journal of StratigraphyVol.
Foraminíferos planctônicos: teca hialina
There is no evidence of benthic foraminifers typical of deep-water habitats while the abundance of Globigerinoides trilobus suggests an outer neritic to upper bathyal paleodepth Murray and Alve, ; Wilson, Active tectonics led to the formation of complicated horst and graben structures and influenced thickness change in the Qom Formation, producing lateral variation of facies Poroohan et al.
Aquitanian, Burdigalian, benthic foraminifera, paleoenvironmental condition. Biozonas de Abathomphalus mayaroensisPlummerita hantkeninoidesGuembelitria cretaceaParvularugoglobigerina eugubina y de Parasubbotina pseudobulloides. Due to different taxonomic interpretations, Olsson et al.
We greatly appreciate the help of Dr. The distribution of benthic foraminifers in the Bagh succession is depicted in Figures 3 and 4. This fact can represent interspersion of local upwelling conditions or nutrients brought by fluvial currents. Productivity across the Cretaceous-Tertiary boundary in high latitudes. According to Van der Zwaan et al. High oxygen content and organic flux cause eutrophic conditions.
Earth and Planetary Science LettersVol. In contrast to these, Arenillas and Arzand Arenillas et al. The planktonic foraminifers are interspersed in the upper part of the section with relatively low diversity, indicating open marine shelf segments, whereas the lower part of the ppanctonicos is characterized by an abundance of benthic foraminifers. Finally, the fourth lineage started with E.
Foraminíferos planctônicos: teca hialina | (biophotos) | Flickr
At the base, predominant greenish gray, fissile, fossiliferous calcareous shale is locally interbedded with thin beds of argillaceous limestone Figure 2. Upper Cretaceous planktonic foraminiferal biostratigraphy from the Carpathians and northern Dobrogea Romania related to macropaleontological zonation.
American PaleontologyBulletin, Vol. La biozona de A.
In Cretaceous-Tertiary mass extinctions: Sampling bias, gradual extinction patterns and catastrophes in the fossil record. Desde el punto de vista cuantitativo Figs. July 23, Corrected manuscript received: