Biostratigraphy of Ojagh Gheshlaq Formation in Tulon

Category Paleontology and Stratigraphy
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 24 May 2008

Abstract:
      The lower Ojagh-Gheshlaq Formation is known to be the source rock for petroleum in the area with regard to its dominated lithology and fossil contents (IFP, 1961). The studied section is located in north east of Ardebil, dominated by shale and sand stone. The formation was calculated as 1350 m thick and of the Late Eocene age due to the frequent fossil species of Globorotalia cerroazulensis, Globorotalia centralis and Discocyclina discus. Never the less the upper Ojagh-Gheshlaq Formation is supposed to go as far as Late Eocene to Oligocene back for the evidence of Globigerina ciproensis and Nummulites vascus incrasatus species. How ever, there still arises much challenge in the separation of the two formations.

   General:
     The lower Ojagh-Gheshlaq Formation is known to be the source rock for petroleum in the area with regard to its dominated lithology and fossil contents (IFP,1961). The studied section is located in north east of Ardebil, dominated by shale and sand stone. The formation was calculated as 1350 m thick and of the Late Eocene age due to the frequent fossil species of Globorotalia cerroazulensis, Globorotalia centralis and Discocyclina discus. Never the less the upper Ojagh-Gheshlaq Formation is supposed to go as far Late Eocene to Oligocene back for the evidence of Globigerina ciproensis and Nummulites vascus incrasatus species. How ever, there still arises much challenge in the separation of the two formations.

tags: ARDABIL