Abstract
AbstractIn this research the Abderaz Formation at its type section with an age of Turonian-early Campanian and a thickness of 300 m containing.light grey shale and marls was investigated. Statistical Studise of the morphotype groups of planktonic foraminifera shows that the majority of them are of shallow water forms (SWF) and deep water forms (DWF) and planktonic to benthic ratio is high indicating specific condition of oligotrophy and sedimentation in a relatively deeper marine condition
Highlights
The Study on the morphotypes and planktonic to benthic ratio was the major aim of the research .This study was intended to explore the marine sedimentation of Abderaz Formation in restrict
Groups of planktonic morphotyes are distinguished by depth of living (Leckie 1987) (Fig2)
This study was intended to explore the marine sedimentation of Abderaz Formation in restrict and the provided curves from morphotypes changes are in full agreement with the curves of the sea level changes and planktonic foraminifer to epifauna benthic ratio(Fig2)
Summary
The Study on the morphotypes and planktonic to benthic ratio was the major aim of the research .This study was intended to explore the marine sedimentation of Abderaz Formation in (outer neritic-upper bathyal) restrict. Material and Method The section studied is located about 1 km to the Muzduran, north eastern Mashhad (a city of Iran), Kopet Dagh basin. At this locality (E: 60, o33/, 00//, N: 360, 10/, 40//)(Fig). About 200300 individuals were picked up for each sample in two size fractions (63-150μm and >150μm) and mounted on dark cardboard slides for identification These two size fractions were analyzed in order to obtain statistically significant representatives of the small and large groups Species identifications are based on (Caron, 1985, Robaszynski and Caron, 1983-1984, 1995 Loeblich and Tappan,1950 , 1988 and Tappan 1940,1943). The geographical map and the ways to the region of the study
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