A biostratigraphic study of the Govanda Formation from two representative localities of Iraqi Kurdistan Region
Sharazwri, A.O.; Saeed, A.T.; Ridha, D.N.; Kharajiany, S.O.A. (2024). A biostratigraphic study of the Govanda Formation from two representative localities of Iraqi Kurdistan Region. Carbonates and Evaporites 39(4). https://dx.doi.org/10.1007/s13146-024-01015-7
In: Carbonates and Evaporites. Springer: New York. ISSN 0891-2556; e-ISSN 1878-5212, more
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| Author keywords |
Govanda Fm., Penjween, Beshkariya, High Folded Zone, Borelis melo melo, Borelis melo curdica, Kurdistan, Iraq |
| Authors | | Top |
- Sharazwri, A.O.
- Saeed, A.T.
- Ridha, D.N.
- Kharajiany, S.O.A.
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| Abstract |
The Govanda Formation is cropped out as a patchy pattern and as high ridges between the Zagros Suture and Imbricated Zones of the Fold and Thrust Belt of Iraq. The present study concerned with the detailed study of biostratigraphy of the Govanda Formation in two representative localities in Kurdistan region of Iraq. 107 samples from both sections were collected and described. The formation is dominantly composed of fossiliferous limestones with conglomerate, sandstone and shale. 32 species of benthic, planktonic foraminifers and other miscellaneous fossils identified that used in the biostratigraphic zonation for determining the age of the Govanda Formation. Some species of benthic and planktonic foraminifers were identified here in the formation have not recorded previously such as Elphidium sp.14, Meanderopsina iranica, Dendritina rangi, Globorotalia archemenardi-Globigerinoides trilobus, Orbulina universa, Quinquiloculina sp., Pyrgo bulloides, Triloculina sp., Ammonia baccari, Austrotrillina howchini, Austrotrillina asmariensis, Miogypsina tani and Miogypsinoides sivasensis. Based on the recognition and distribution of the foraminiferal species in the Govanda Formation, three assemblage zones were identified, they are a) Austrotrillina howchini- Miogypsina-Miogypsinoides-Peneroplis evolutus-Peneroplis farsensis Assemblage Zone of the Aquitanian age. b) Borelis melo melo-Borelis melo curdica-Meanderopsina iranica-Elphidium sp.14 Assemblage Zone of the Burdigalian age. c) new-recognized Assemblage Zone in this study that comprises Globorotalia archemenardi-Globigerinoides trilobus-Orbulina universa Assemblage Zone of the Langhian age. According to the described zones and fossil contents, the biostratigraphic analysis indicates that the age of the Govanda Formation is Early-Middle Miocene (Aquitanian-Langhian). |
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