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Biometric Analysis of Lepidocyclina (Nephrolepidina) from Baba Formation (Late Oligocene) in Bai-Hassan Well-25, Kirkuk Area, Northeast Iraq

Received: 25 September 2014    Accepted: 07 October 2014    Published: 20 October 2014
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Abstract

The investigation is based on a subsurface sequences of bioclastic limestone in Kirkuk area, Northeastern Iraq. These sequences were deposited in a shallow open marine environment during Late Oligocene. Tests of larger foraminifera Lepidocyclina(Nephrolepidina) are abundant in the lower and upper parts of the Baba Formation. Biometric investigations of the Megalospheric forms of Nephrolepidina assemblages from, Bai-Hassan well- 25 section led to recognize three morphometrically defined species by the combination of three parameters, 1- the degree of embracement of the protoconch by the deuteroconch (Factor A), 2- the numbers of accessory auxiliary chambers on the deuteroconch (Factor B), and 3- (Factor C ) which expressed by the protoconch angle( ) formed by the two hypothetical line from the center of protoconch throught the outer attachment points of the deuteroconch walls with protoconch.

DOI 10.11648/j.sr.20140205.16
Published in Science Research (Volume 2, Issue 5, October 2014)
Page(s) 111-118
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Late Oligocene, Kirkuk Area, Northeast Iraq, Bai-Hassan Well-25, Biometric Analysis

References
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Author Information
  • Department of Geology School of Science, Faculty of Science and Scientific Education, Sulaimani University—Iraqi Kurdistan Region.

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    Imad Mahmood Ghafor. (2014). Biometric Analysis of Lepidocyclina (Nephrolepidina) from Baba Formation (Late Oligocene) in Bai-Hassan Well-25, Kirkuk Area, Northeast Iraq. Science Research, 2(5), 111-118. https://doi.org/10.11648/j.sr.20140205.16

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    ACS Style

    Imad Mahmood Ghafor. Biometric Analysis of Lepidocyclina (Nephrolepidina) from Baba Formation (Late Oligocene) in Bai-Hassan Well-25, Kirkuk Area, Northeast Iraq. Sci. Res. 2014, 2(5), 111-118. doi: 10.11648/j.sr.20140205.16

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    Imad Mahmood Ghafor. Biometric Analysis of Lepidocyclina (Nephrolepidina) from Baba Formation (Late Oligocene) in Bai-Hassan Well-25, Kirkuk Area, Northeast Iraq. Sci Res. 2014;2(5):111-118. doi: 10.11648/j.sr.20140205.16

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  • @article{10.11648/j.sr.20140205.16,
      author = {Imad Mahmood Ghafor},
      title = {Biometric Analysis of Lepidocyclina (Nephrolepidina) from Baba Formation (Late Oligocene) in Bai-Hassan Well-25, Kirkuk Area, Northeast Iraq},
      journal = {Science Research},
      volume = {2},
      number = {5},
      pages = {111-118},
      doi = {10.11648/j.sr.20140205.16},
      url = {https://doi.org/10.11648/j.sr.20140205.16},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.sr.20140205.16},
      abstract = {The investigation is based on a subsurface sequences of bioclastic limestone in Kirkuk area, Northeastern Iraq. These sequences were deposited in a shallow open marine environment during Late Oligocene. Tests of larger foraminifera Lepidocyclina(Nephrolepidina) are abundant in the lower and upper parts of the Baba Formation. Biometric investigations of the Megalospheric forms of Nephrolepidina assemblages from, Bai-Hassan well- 25 section led to recognize three morphometrically defined species by the combination of three parameters, 1- the degree of embracement of the protoconch by the deuteroconch (Factor A), 2- the numbers of accessory auxiliary chambers on the deuteroconch (Factor B), and 3- (Factor C ) which expressed by the protoconch angle( ) formed by the two hypothetical line from the center of protoconch throught the outer attachment points of the deuteroconch walls with protoconch.},
     year = {2014}
    }
    

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    AB  - The investigation is based on a subsurface sequences of bioclastic limestone in Kirkuk area, Northeastern Iraq. These sequences were deposited in a shallow open marine environment during Late Oligocene. Tests of larger foraminifera Lepidocyclina(Nephrolepidina) are abundant in the lower and upper parts of the Baba Formation. Biometric investigations of the Megalospheric forms of Nephrolepidina assemblages from, Bai-Hassan well- 25 section led to recognize three morphometrically defined species by the combination of three parameters, 1- the degree of embracement of the protoconch by the deuteroconch (Factor A), 2- the numbers of accessory auxiliary chambers on the deuteroconch (Factor B), and 3- (Factor C ) which expressed by the protoconch angle( ) formed by the two hypothetical line from the center of protoconch throught the outer attachment points of the deuteroconch walls with protoconch.
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