Late Paleocene Orthophragminae (Foraminifera) from the Haymana-Polatli Basin, central Turkey and description of a new taxon, Orbitoclypeus haymanaensis

A transgressive shallow-marine succession suggested as a reference-section for early Thanetian by the "Early Paleogene working group" (IGCP 286) was studied for its orthophragminid foraminifera from Haymana-Polath Basin in central Anatolia. Orthophragminae, closely associated with Assilina...

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Bibliographic Details
Published in:Micropaleontology 2001-12, Vol.47 (4), p.339-357
Main Authors: Ozcan, Ercan, Sirel, Ercument, Altiner, Sevinc Ozkan, Colakoglu, Sinan
Format: Article
Language:English
Subjects:
Anatolia
Asia
assemblages
Biometrics
biostratigraphy
Cenozoic
Discocyclina
Discocyclina seunesi
Embryos
Foraminifera
Geology
Haymana-Polatli Basin
Invertebrata
invertebrate
Limestones
lithostratigraphy
marine environment
microfossils
Micropaleontology
Middle East
morphology
New species
new taxa
Orbitoclypeus
Orbitoclypeus haymanaensis
Orbitoclypeus neumannae
Orbitoidacea
Orthophragminae
Paleocene
Paleogene
Paleontology
Protista
Rotaliina
Sandstones
sea-level changes
Sediments
shallow-water environment
Specimens
Stratigraphy
taxonomy
Tertiary
Thanetian
transgression
Turkey
upper Paleocene
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Description
Summary:A transgressive shallow-marine succession suggested as a reference-section for early Thanetian by the "Early Paleogene working group" (IGCP 286) was studied for its orthophragminid foraminifera from Haymana-Polath Basin in central Anatolia. Orthophragminae, closely associated with Assilina yvettae and Operculina heberti, have been identified in a friable clastic-carbonate sequence which contains Glomalveolina in its different horizons. Basinal sediments with planktonic taxa overlie the shallow-water deposits and preclude the study of orthophragminae higher in the succession. Orthophragminae, studied in oriented sections, were grouped into four categories considering the qualitative and quantitative aspects of megalospheric embryo and morphologic elements of equatorial and lateral chamberlets in equatorial and partly vertical sections. Thus, Discocyclina seunesi, Orbitoclypeus neumannae and Discocyclina sp. 1 have been identified and a new species, Orbitoclypeus haymanaensis, is erected. These assemblages were dated to Thanetian based upon the calcareous nannofossil and planktonic foraminifera identified in the overlying basinal sediments and also the benthonic foraminifera either associated with orthophragminae or present in different horizons of the shallow-marine succession.
ISSN:0026-2803
1937-2795
DOI:10.2113/47.4.339