Successive extinctions of muricate planktonic foraminifera (Morozovelloides and Acarinina) as a candidate for marking the base Priabonian

Wade, Bridget S.; Fuček, Vlasta Premec; Kamikuri, Shin-ichi; Bartol, Miloš; Luciani, Valeria; Pearson, Paul Nicholas

doi:10.1127/0078-0421/2012/0023

Cited by 20 publications

(40 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The top of Morozovelloides crassatus marks the base of the Globigerinatheka semiinvoluta HOZ Zone (Zone E14), and has been calibrated to 38.0 Ma in Subchron C17n. 3n at ODP Site 1052 in the western North Atlantic Ocean (Wade 2004) and in the Alano Section, Italy (Wade et al 2012). The entire section is therefore stratigraphically higher than this.…”

Section: Planktonic Foraminiferal Biostratigraphymentioning

confidence: 87%

“…This proposal also takes into account current biostratigraphical practices which place the extinction of the large muricate planktonic foraminifera Acarinina and Morozovelloides within the Bartonian while the nannofossil Isthmolithus recurvus and larger benthic foraminifera Nummulites fabianii would be confined to the Priabonian (Agnini et al 2011). An alternative proposal by Wade et al (2012) places the GSSP at the last occurrence horizon of the large muricate planktonic foraminifera Morozovelloides which is very close to, but slightly above, the extinction of the large acarininids. These levels have been widely used in global biostratigraphic schemes (Blow 1969, Toumarkine and Luterbacher 1985, Wade 2004, Berggren and Pearson 2005, Wade et al 2011).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integrated stratigraphy of the Priabonian (upper Eocene) Urtsadzor section, Armenia

Cotton¹,

Zakrevskaya²,

Boon³

et al. 2017

nos

Self Cite

View full text Add to dashboard Cite

The transition from the Bartonian to the Priabonian, as traditionally understood, has long been associated with a series of extinctions and originations in several microfossil groups. The planktonic foraminifer genus Morozovelloides and large species of Acarinina suffered a rapid global extinction, as did many radiolarians. Calcareous nannofossils show several assemblage changes including the acme beginning of Cribrocentrum erbae and the lowest and highest occurrences of Chiasmolithus oamaruensis and C. grandis respectively. In shallow water environments, larger foraminifera also show an extinction among large species of Nummulites, as well as the first occurrences of the stratigraphically important genus Spiroclypeus. However, the correlation between shallow and deep water records remains uncertain, as do the mechanisms driving these biotic events. Here we present the results of a new integrated stratigraphical study (calcareous nannofossils, planktonic foraminifera, larger benthic foraminifera, and low-resolution magnetostratigraphy) of the Urtsadzor section in southwestern Armenia which appears to be continuous through this interval. The Urtsadzor section consists of calcareous siltstones rich in micro-and nannofossils, with interbedded limestones containing abundant larger benthic foraminifera. Our new data enable us to correlate larger foraminiferal events with global plankton biostratigraphy, in a section outside of southwest Europe where most previous correlations have been based. At Urtsadzor, the large Nummulites species of N. millecaput-group are present throughout the whole section but decrease in abundance toward the top. The first occurrence of Spiroclypeus, also occurs in the upper part of the section, marking the SBZ 18/19 boundary. These events are associated with the phylogenetic development of the Nummulites fabianii and Heterostegina reticulata lineages. However, the calcareous plankton biostratigraphy indicates the section is well within the Priabonian; within plank

show abstract

Section: Planktonic Foraminiferal Biostratigraphymentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Integrated stratigraphy of the Priabonian (upper Eocene) Urtsadzor section, Armenia

Cotton¹,

Zakrevskaya²,

Boon³

et al. 2017

nos

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, the Bc of C. erbae could be used as a primary criterion, although the real strength of this proposal is related to the occurrence of other good stratigraphical markers, as the extinction of planktonic foraminifer Morozovelloides crassatus (Wade et al . ), or the base of Subchrons C17n.3n and C17n.2n (Agnini et al . ; GTS12), that are in fact observed close to the proposed boundary (Fig.…”

Section: Overview Of Cenozoic Calcareous Nannofossil Biostratigraphymentioning

confidence: 99%

Calcareous nannofossil biostratigraphy: historical background and application in Cenozoic chronostratigraphy

Agnini

Monechi

Raffi

2017

LET

View full text Add to dashboard Cite

Calcareous nannofossils are considered one of the most powerful biostratigraphical tool in marine carbonate sediments especially in open ocean settings. Their origination goes at least as far back as the Triassic (ca. 220 Ma) when they first biomineralized and produced calcite skeletons. Since then, they have evolved rapidly showing widespread biogeographical distributions. Starting from the 1950s, changes in calcareous nannofossil assemblages have been used to date rocks and sediments and a fundamental step was achieved two decades later with the publication of the first comprehensive biostratigraphical schemes. Standardized quantitative counting methods, unambiguous taxonomy as well as highly resolved data sets provide high-quality biostratigraphical datums which, in turn, result in the precise positioning of calcareous nannofossil biohorizons and in the construction of reliable biostratigraphical frameworks. Here, we use recently published Cenozoic biozonations as a framework to present an overview of the calcareous nannofossil biohorizons which are used in chronostratigraphy to denote Cenozoic Global Standard Stratotype-section and Point

show abstract

“…5), Southern Ocean, and northwest Atlantic settings (Edgar et al, 2012;Luciani et al, 2010 Bartonian/Priabonian boundary with a major demise in the Acarinina lineage and the extinction of Morozovelloides. Only small (< 125 µm) and relatively rare acarininids survived into the late Eocene and Oligocene (Agnini et al, 2011;Berggren et al, 2006;Wade, 2004;Wade et al, 2012). An episode with loss of symbiosis resulting in bleaching caused by global warming has been proposed to explain the second muricate crisis (Edgar et al, 2012).…”

Section: Possible Causes Of Morozovellids Decline Across the Eecomentioning

confidence: 99%

“…These genera are also known as muricates, from the muricae that form conical pustules on the test wall. Among calcareous microplankton, the muricates were one of the major calcifiers in the low latitude early Paleogene oceans and almost completely disappeared at about 38 Ma, near the Bartonian/Priabonian boundary (Agnini et al, 2011;Luciani et al, 2010;Wade, 2004;Wade et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Massive and permanent decline of symbiont bearing morozovellids and δ<sup>13</sup>C perturbations across the Early Eocene Climatic Optimum at the Possagno section (Southern Alps of northeastern Italy)

Luciani

Backman

Fornaciari

et al. 2015

Preprint

View full text Add to dashboard Cite

Abstract. The Early Eocene Climatic Optimum (EECO) records the highest prolonged global temperatures over the past 70 Ma. Understanding the causes and timing of Eocene climate change remains a major challenge in Cenozoic paleoceanography, which includes the biotic response to climate variability and the changes among planktic foraminiferal assemblages across the EECO. The symbiont bearing and shallow dwelling genera Morozovella and Acarinina were important calcifiers in the tropical-subtropical early Paleogene oceans but almost completely disappeared at about 38 Ma, near the Bartonian/Priabonian boundary. We show here that morozovellids record a first critical step across the EECO through a major permanent decline in relative abundance from the Tethyan Possagno section and ODP Site 1051 in the western subtropical North Atlantic. Possible causes may include increased eutrophication, weak water column stratification, changes in ocean chemistry, loss of symbiosis and possible complex interaction with other microfossil groups. Relative abundances of planktic foraminiferal taxa at Possagno parallel negative shifts in both δ13C and δ18O of bulk sediment from Chron C24r to basal Chron C20r. The post-EECO stable isotopic excursions towards lighter values are of modest intensity. Significant though ephemeral modifications in the planktic foraminiferal communities occur during these minor isotopic excursions. These modifications are marked by pronounced increases in relative abundance of acarininids, in a manner similar to their behaviour during pre-EECO hyperthermals in the Tethyan settings, which suggest a pronounced biotic sensitivity to climate change of planktic foraminifera even during the post-EECO interval.

show abstract

Successive extinctions of muricate planktonic foraminifera (Morozovelloides and Acarinina) as a candidate for marking the base Priabonian

Cited by 20 publications

References 0 publications

Integrated stratigraphy of the Priabonian (upper Eocene) Urtsadzor section, Armenia

Integrated stratigraphy of the Priabonian (upper Eocene) Urtsadzor section, Armenia

Calcareous nannofossil biostratigraphy: historical background and application in Cenozoic chronostratigraphy

Massive and permanent decline of symbiont bearing morozovellids and δ<sup>13</sup>C perturbations across the Early Eocene Climatic Optimum at the Possagno section (Southern Alps of northeastern Italy)

Contact Info

Product

Resources

About

Successive extinctions of muricate planktonic foraminifera (Morozovelloides and Acarinina) as a candidate for marking the base Priabonian

Cited by 20 publications

References 0 publications

Integrated stratigraphy of the Priabonian (upper Eocene) Urtsadzor section, Armenia

Integrated stratigraphy of the Priabonian (upper Eocene) Urtsadzor section, Armenia

Calcareous nannofossil biostratigraphy: historical background and application in Cenozoic chronostratigraphy

Massive and permanent decline of symbiont bearing morozovellids and δ&lt;sup&gt;13&lt;/sup&gt;C perturbations across the Early Eocene Climatic Optimum at the Possagno section (Southern Alps of northeastern Italy)

Contact Info

Product

Resources

About

Massive and permanent decline of symbiont bearing morozovellids and δ<sup>13</sup>C perturbations across the Early Eocene Climatic Optimum at the Possagno section (Southern Alps of northeastern Italy)