Abstract
AbstractIn order to study the fossil contents of the Ruteh Formation for biostratigraphical purposes, the 200 meters thick section was sampled at Harijan section, Central Alborz. The sequence is mainly made up of limestone and shale's. The lower contact of the formation with Dorud Formation is disconform while the upper contact with under learing Dorud Formation is disconformable with overling Nesen Formation is as well as disconformable. Fifty four species belonging to 27 genera (foraminifera and conodonts) were identified and three biozones were differentiated. These are formation: 1- Schubertella giraudi- Codonofusiella distincta Assemblage Zone, 2- Cribrigenerina sumatruna- Langella ocarina Assemblage Zone, 3- Sweetognathus whitei Biozone. Based on, these an age of Yackhtaschian - Murghabian is quoted to the formation.
Highlights
The systematic study of benthic foraminifera in isolated form for biozonation and precise age dating of the Ruteh Formation at Harijan section, Central Alborz was the major aim of this research
The Harijan section of the formation with a thickness of 200m (E: 51, o20/, 00//, N: 360, 14/, 18//) is located on the Tehran-Karaj-Chalus road, some 130 km to the northeastern of Karaj (Fig.1) and contains 5 lithological units mainly made up carbonate rock bearing gastropod and brachiopods (Fig2)
One hundred and five samples were gathered from the Harijan section of the Ruteh Formation
Summary
The systematic study of benthic foraminifera in isolated form for biozonation and precise age dating of the Ruteh Formation at Harijan section, Central Alborz was the major aim of this research. Stratigraphy The Ruteh Formation is one of the upper Permian rock units in the Central Alborz sedimentary basin in northern of Iran. The Harijan section of the formation with a thickness of 200m (E: 51, o20/, 00//, N: 360, 14/, 18//) is located on the Tehran-Karaj-Chalus road, some 130 km to the northeastern of Karaj (Fig.1) and contains 5 lithological units mainly made up carbonate rock bearing gastropod and brachiopods (Fig). At the Harijan section alike all other regions the lower contact of the formation with Dorud Formation is disconform. The upper contact with Nesen Formation is disconform. The geographical map and the ways to the region of the study
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