Abstract
AbstractThe study of planktonic foraminifera of the Gurpi formations at Lar area (Kuh-e-kurdeh section) enables me to find the most standard biozones defined in mediterranean regions, especially Tethysian domain. Five biozones were determined. Biozones I (Globotruncanita elevata zone) and II (Globotruncana ventricosa zone) and III (Radotruncana calcarata zone) indicate the Early Campanian and Middle and Late Campanian, respectively. Biozones IV (Globotruncanita stuarti zone) and V (Gansserina gansseri zone) suggest the Early and Middle Maastrichtian, respectively. In the Late Maastrichtian, due to decreasing in water depth at the study area, Abathomphalus mayaroensis zone defined in Tethysian domain was not recognised.
Highlights
At the type section (E: 49o 13' 47", N: 32o 26' 50"), the Gurpi Formation composed of 320 meters grey to blue marl and shale beds and occasionally thin beds of argillaceous limestone (Darvishzadeh,1992, James & Wynd,1965, Motiei, 1993, Setudehnia,1972)
Biostratigraphy Planktonic foraminifera are important to universal biostratigraphy zonation of Upper Cretaceous marine sediments
The value of these foraminifera for correlation has been discussed by Bandy (1967). 10 genera and 22 species of planktonic foraminifera were recognized at the studied area, 5 biozones were identified in thin section and isolated specimens (Fig.2)
Summary
At the type section (E: 49o 13' 47", N: 32o 26' 50"), the Gurpi Formation composed of 320 meters grey to blue marl and shale beds and occasionally thin beds of argillaceous limestone (Darvishzadeh,1992, James & Wynd,1965, Motiei, 1993, Setudehnia,1972). The thickness of Gurpi Formation is 70 meters in studied section and consists of: Marl, Limy marl, Marly shale and Marly limestone. 10 genera and 22 species of planktonic foraminifera were recognized at the studied area, 5 biozones were identified in thin section and isolated specimens (Fig.2).
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