Maastrichtian

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1 - Biostratigraphy of the Gurpi Formation Based on Planktonic foraminifera with emphasis on the Cretaceous-Paleogene boundary in Jahangirabad Section, Kabirkuh Anticline, SW Iran
Alireza Ashouri Samira Rahimi Abass Sadeghi Abbas Ghaderi
20.1001.1.22518738.1396.7.14.6.2

In this research, biostratigraphy of the Gurpi Formation in Jahangirabad section, SW Iran, has been studied .The thickness of the Gurpi Formation in this section is 263 and consists mainly of argillaceous limestone and limestone. The lower boundary with the Ilam Formati More

In this research, biostratigraphy of the Gurpi Formation in Jahangirabad section, SW Iran, has been studied .The thickness of the Gurpi Formation in this section is 263 and consists mainly of argillaceous limestone and limestone. The lower boundary with the Ilam Formation is comformable with sharp lithology and upper boundary with the Pabdeh Formation is gradational. In this study, 76 species belong to 17 genera and 8 biozones of planktonic foraminifera were recognized. The biozones consist of Globotruncana ventricosa Zone, Radotruncana calcarata Zone, Globotruncanella havanensis Zone, Globotruncana aegyptica Zone, Gansserina gansseri Zone, Contusotruncana contuosa Zone, Abathomphalus mayaroensis Zone and Pseudoguembelina hariaensis. The age of the Gurpi Formation in this section based on these biozones is Middle Campanian to Late Maastrichtian in this section. Manuscript profile
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2 - Reconstruction of the sedimentary environment of the Tarbur Formation based on microfacies and microtaphofacies analysis in the Murak area (southwest of Semirom)
Hossein Ghanbarloo Hosyen Vaziri moghadam
20.1001.1.22518738.1398.9.18.5.3

Reconstruction of the sedimentary environment of the Middle-Upper Maastrichtian deposits (Tarbur Formation) in the Murak area (southwest of Semirom) was performed based on Microfacies and microtaphofacies analysis. The formation with 239 m thickness consists of limeston More

Reconstruction of the sedimentary environment of the Middle-Upper Maastrichtian deposits (Tarbur Formation) in the Murak area (southwest of Semirom) was performed based on Microfacies and microtaphofacies analysis. The formation with 239 m thickness consists of limestone and shale. Meanwhile, the Tarbur deposits overlie the Gurpi Formation and is covered by the Paleocene deposits. Seven and five microfacies and microtaphofacies were recognized based on the main components and sedimentological and taphonomical features, respectively. In addition, these microfacies and microtaphofacies were deposited in homonicnal carbonate ramp. From the viewpoint of vertical distribution and interpretation of microfacies and microtaphofacies, the Tarbur deposits were formed in the energetic environment (under the influence of the storm waves) in the study area. Therefore, communities of rudist are absent and the green algae (Dasycladales) are abundant in the study area. Concerning the high rate of detrital grain input and increasing of nutrients, the bryozoans were performed the encrusting more than other organisms. Manuscript profile

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List of Articles Maastrichtian