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دسترسی آزاد مقاله
1 - Biostratigraphy of Devonian-Carboniferous boundary in Tuyeh-Darvar section, north of Iran
Mohammad Taghi Najjarzadeh Ali Reaza Ashouri Mehdi Yazdi Ali BahramiDevonian-Carboniferous boundary is not clear in the Eastern Alborz Mountains. In the current study Tuyeh-Darvar section with about 170 m, thickness is selected. In this investigation, the primary goal is revision of Devonian/Carboniferous Boundary (known as DCB) and the چکیده کاملDevonian-Carboniferous boundary is not clear in the Eastern Alborz Mountains. In the current study Tuyeh-Darvar section with about 170 m, thickness is selected. In this investigation, the primary goal is revision of Devonian/Carboniferous Boundary (known as DCB) and the other goal is the redefinition of the DCB as a famous necessity (based on ICS program in 2008 for defining the boundary and to find a new GSSP). According to Conodont data from acid-leaching 53 carbonate samples(by acid acetic) that obtained from Late Devonian and Early Carboniferous deposits in this section, and based on standard conodont Zonation 6 Zone are recognized;1. Bi.ultimus/or Si.praesulcata Zone, 2. Pr.kockeli /or Si.sulcata Zone, 3. Si.duplicata to Si.sandbergi bio interval, 4. Si.crenulata Zone, 5.Gnathodus-P.inornatus Zone, and 6.Ps.multistriatus Zone. Considering to the Conodont Zones above mentioned, Conodont faunas and other evidences, in the Tuyeh-Darvare section the DCB, is located within cream to grey silt stone beds, which are lies between K6 limestone and K8 dark carbonate beds (about 7.10 m above the base of recent studied section). پرونده مقاله -
دسترسی آزاد مقاله
2 - محیط رسوبی و چینه نگاری سکانسی سنگهای دونین بالایی ناحیه زفره(برش شرقی) شمال شرق اصفهان
الهام غفاری واچیک هایراپطیان سید حسن حجازی -
دسترسی آزاد مقاله
3 - Presentation of a Rich fauna Athyrididae from the Late Devonian and Early Carboniferous North of Damghan (Jeyrud and Mobarak Formations)
Babak Aghababalu Mohammad JafarianAthyrididae belong to one of the important Brachiopod groups, typical of Upper Devonian & Early Carboniferous sediments. This family has a world-wide diversification with many species. This study for the first time is on fossils of the Jeyrud and Mobarak Formations چکیده کاملAthyrididae belong to one of the important Brachiopod groups, typical of Upper Devonian & Early Carboniferous sediments. This family has a world-wide diversification with many species. This study for the first time is on fossils of the Jeyrud and Mobarak Formations in Balast Mine (North East Railway Co.). The sediments have a rich fauna of Corals, Crinoids and other groups of Brachiopods. Compared with other sections in Iran, this section has the richest fauna of athyris. (Samples are in Azad University, branch of Izeh). According to this study we recognized. - Athyris globolina (Waagn 1884).- Cleiothyridina coloradensis (Girty 1900).- Cleiothyridina coloradensis intermedia (Chao 1938).- Cleiothyridina davidi (Chao 1938).- Cleiothyridina kusbassica (Benznosova 1963).- Cleiothyridina (Leiothycridina) okensis (Grunt 1980).- Cleiothyridina orbicularis (Chao 1938).- Cleiothyridina transversa (Stainbrook 1947).- Cleiothyridina transversa geirudensis (Assereto 1962).- Composita ambigua (Soworby 1839).- Composita megala (Tolmacher 1924). پرونده مقاله