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Alveolinids from the Lower Indus Basin, Pakistan (Eastern Neo‐Tethys ): Systematic and biostratigraphic implications
Author(s) -
Rahman Maqsood Ur,
Hanif Muhammad,
Jiang Tao,
Wahid Sohail
Publication year - 2021
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.4119
Subject(s) - foraminifera , paleontology , geology , biostratigraphy , taxon , benthic zone , structural basin , taxonomy (biology) , paleoecology , cenozoic , zoology , biology , oceanography
The alveolinid group of larger benthic foraminifera has been vastly studied in western and central Neo‐Tethys, but less well analysed in eastern Neo‐Tethys. In this study, 19 Ypresian (Ilerdian–Cuisian) and Early Lutetian species of Alveolina have been identified and their biometrics, taxonomy, and biostratigraphic correlation with western and central Neo‐Tethys discussed. The Taxa of Early Ypresian age (SBZ5‐9) includes Alveolina vredenburgi , A. dedolia , A. subpyrenaica , A . cf. subpyrenaica , A. moussoulensis , A. aragonensis , A. decipiens , A. cylindrata, and A. ilerdensis . The Late Ypresian age (SBZ10‐12) taxa includes A. ruetimeyeri A. oblonga , A. haymanensis , A. lehneri, A. cosinensis cosigena, A . aff. frumentiformis, A sp. aff. A. azzarolii, and A. elliptica . The Early Lutetian age (SBZ13) taxa include A. stercusmuris and A. keili . The identified species have a close affinity to those reported from other areas of the Tethyan realm. However, some of these Alveolina species are considered to have stratigraphic ranges longer than formerly reported. The first appearance of A . ilerdensis (SBZ8‐10) is recorded earlier in SBZ7. The first appearance of A. ruetimeyeri (SBZ10‐11) is recorded earlier in SBZ‐9. The study provides more evidence for understanding the evolution of the Alveolina species and their biostratigraphic distribution in the eastern Tethyan realm.