Stratigraphy and Palaeontology
Mahin mohamadi; R. Shabanian; H. M. Alizadeh
Abstract
This research has aimed to study the biostrtigraphy and lithostratigraphy of late cretaceous deposits in south of Maracan village , with 320 m thickness.This sequence overlaid the lower cretaceous deposits and have been covered by Quaternary sedimentary and magmatic rocks. Based on field ...
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This research has aimed to study the biostrtigraphy and lithostratigraphy of late cretaceous deposits in south of Maracan village , with 320 m thickness.This sequence overlaid the lower cretaceous deposits and have been covered by Quaternary sedimentary and magmatic rocks. Based on field study and lithological diversity 8 lithic zone have been investigated. 102 samples have been picked up systematically from this sequence. This study lead to determining 41 species from 15 genera of planktonic foraminifera.The systematic and classification of fauna are based on The (Postuma 1971) , (Caron1985) , (Loeblich and Tappan 1988) and (Permoli Silva And Verga 2004). .Based on their range chart the bio zonation model for this deposit with 9 Bio Zones as bellow have been suggested and have compared with cretaceous global standard bio zones (Robazynsky and Caron 1985) and (Permoli Silva and Verga, 2004) Dicarinella concavata Interval Zone (Robazynsky and Caron, 1995) Dicarinella asymetrica Total range Zone(Robazynsky and Caron, 1995) Globotruncanita elevata IntervalrangeZone(Robazynsky and Caron, 1995) Globotruncana ventricosa IntervalZone (Robazynsky and Caron, 1995) Rodotruncana calcarata Total range Zone(Robazynsky and Caron, 1995) Globotruncanella havnensis Partial Range Zone (Robaszynski and Caron, 1985) Globotruncana aegyptiaca Interval Zone (Robazynsky and Caron, 1995) Gansserina gansseri Interval Zone (Robazynsky and Caron, 1995) Abathamphalus mayaroensis Total range Zone(Robazynsky and Caron, 1995) The suggested age for th.is sequence based on planktonic foraminifera is upper coniantian to upper Maestrichtian and belong to deep shelf area . Based on the morphology of planktonic foraminifera and their keei we suggest deep sea environment for these deposits.
R Shabanian; N Ghanizadeh
Abstract
The Illanqareh Formation consists of sandstone, shale, dolomite, extrusive igneous rocks, and limestone. This Formation is about 400 m thick and crops out in the west of Illanlu village, south of the Aras dam, north of the West Azarbaijan province. The clastic deposits of the Illanqareh formation attributed ...
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The Illanqareh Formation consists of sandstone, shale, dolomite, extrusive igneous rocks, and limestone. This Formation is about 400 m thick and crops out in the west of Illanlu village, south of the Aras dam, north of the West Azarbaijan province. The clastic deposits of the Illanqareh formation attributed to the late Devonian and the upper carbonate division belongs to the early Carboniferous. The study of prepared thin sections resulted in recognizing 15 species related to 9 genera of 8 foraminifera families. The comparison of identified foraminifera' assemblage in the studied stratigraphical section with those from other Carboniferous formations of Iran and the world indicated a Tournasian- Visean age for the marine deposits of this formation. The Illanqarah formation in the Illanlu section overlies the early Devonian Muli formation and underlies the early Permian Doroud formation both disconformably.
