Late campanian-maastrichtian evolution of orbitoidal foraminifera in Haymana basin succession (Ankara, Central Turkey)

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dc.contributor.authorÖzcan E.
dc.contributor.authorÖzkan Altiner S.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued1997
dc.departmentNiğde ÖHÜ
dc.description.abstractIn Central Anatolia, a thick sedimentary succession composed of deep-water turbiditic units represented by marl-shale, sandstone, olistostromal horizons and carbonates crops out. This succession constitutes the lower part of so-called Haymana Basin spanning the Santonian (?)/Campanian-Eocene time interval. Evolution of Lepidorbitoides and Orbitoides concerning embryonic features and the initial chamber arrangement has been investigated in the Late Cretaceous part of this succession. Previously unrecognized assemblages of L. campaniensis - "primitive stage" of O. megaloformis of Late Campanian, L. bisambergensis - "advanced stage" of O. megaloformis of Early Maastrichtian and L. socialis - O. apiculata / O. gensacicus of Late Maastrichtian age have been documented with their biometric aspects. A wide range of variation of evolutionary parameters such as embryon size (Li+li) and number of epi-embryonic chambers (E) of the Orbitoides specimens in the same and successive populations has been observed. Existence of primitive Orbitoides (O. media type) embryons in phylogenetically advanced populations is very conspicuous. Concerning the variation in embryonic features (transition from biserial to quadriserial forms in Lepidorbitoides) and evolutionary parameters in Orbitoides (Li+li : Size of embryon, E : Number of epi-embryonic chambers) and Lepidorbitoides (D : Size of deuteroconch; D/P : Ratio of size of deuteroconch to protoconch; a : Number of a adauxiliary chambers) it can be proposed that Lepidorbitoides is more reliable than Orbitoides in aging the populations at least during Late Campanian-Early Maastrichtian time interval.
dc.identifier.endpage290
dc.identifier.issn0253-6730
dc.identifier.issue1
dc.identifier.scopus2-s2.0-0031399616
dc.identifier.scopusqualityQ4
dc.identifier.startpage271
dc.identifier.urihttps://hdl.handle.net/11480/1437
dc.identifier.volume16
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.relation.ispartofRevue de Paleobiologie
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAnkara
dc.subjectBenthic foraminifera
dc.subjectCampanian-Maastrichtian
dc.subjectCentral Turkey
dc.subjectHaymana Basin
dc.subjectLepidorbitoides
dc.subjectNepionic arrangement
dc.subjectOrbitoides
dc.titleLate campanian-maastrichtian evolution of orbitoidal foraminifera in Haymana basin succession (Ankara, Central Turkey)
dc.typeArticle

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