The last occurrence of Cassigerinella chipolensis in the Mediterranean region

Martinotti, Guido Menahem

doi:10.2113/gsjfr.19.3.180

Cited by 2 publications

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“…The taxonomic diversity of planktonic foraminifers in the Rapovce Member decreases to several species: Tenuitella gemma, Cassigerinella globulosa, Globorotaloides hexagonus and Catapsydrax martini. Dwarfing of planktonic foraminfers implies stress-induced conditions, such as the influence of hyposaline waters on the morphogenesis of Cassigerinella chipolensis (Martinotti, 1989) or cool-water preferences of tunuitellids (Pipperr & Reichenbacher, 2010). Stress conditions of surface-water productivity, which were also indicated by the appearance of pyritized frustules of diatoms and tests of pteropods, were caused probably by eutrophication, shallowing and brackishing of sea-water (Šutovská 1987).…”

Section: Foraminifera: Biostratigraphy and Paleoenvironmentsmentioning

confidence: 99%

Oligocene-Early Miocene Planktonic Microbiostratigraphy and Paleoenvironments of the South Slovakian Basin (Lučenec Depression)

Ozdínová

Soták²

2015

Geologica Carpathica

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Oligocene and Lower Miocene sediments of the Lučenec Depression were studied to demonstrate the planktonic bioevents and climatic proxies from the Číž Formation (Rupelian) and Lučenec Formation (Chattian-Aquitanian) on the basis of quantitative analyses of foraminifers and calcareous nannofossils. The oldest nannofossil assemblages of the Číž Formation belonged to the NP23 Zone and were dominated by Reticulofenestra ornata known for preference of temperate eutrophic water conditions. An increase in bioproductivity was documented by abundant large-sized planktonic foraminifers (e.g. Turborotalia ampliapertura, Paragloborotalia nana, Subbotina gortanii) and epifaunal to shallow-infaunal benthic species. The middle part of the Číž Formation reveals a lowstand progradation of deltaic sediments of the Rapovce Member. There, the planktonic foraminifers are impoverished in both size and diversity, containing mostly tenuitellid and cassigerinellid species, probably as a result of decreased salinity and increased anoxia in the Tard Clay. Contrary of this, the benthic foraminifers are rich, mainly the infaunal forms of uvigerinid species. They probably proliferated due to a high organic flux from riverine input.

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Section: Foraminifera: Biostratigraphy and Paleoenvironmentsmentioning

confidence: 99%