Biometric resolution of Plicatipollenites and Potonieisporites in the Lower Gondwana succession of India

K.M. Lele; Manoj Shukla

doi:10.54991/jop.1976.1012

Authors

K.M. Lele Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
Manoj Shukla Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.1976.1012

Abstract

Plicatipollenites and Potonieisporites can be distinguished by a new criterion, viz., the "Distal saccus spread". Accordingly, Plicatipollenites belongs to the "Monosaccate group" characterized by "Uniform saccus spread" and Potonieisporites to the "Monosaccoid group" having "Differential saccus spread". The morphological variation in the two populations has been resolved through a multivariate analysis in time and space, covering the Talchir, Karharbari and Barakar span in five Lower Gondwana basins. Suitable 'norms' were selected in the two populations for analysing four parameters of variation, viz. (i) Miospore symmetry, (ii) Tetrad mark, (iii) Body infold symmetry, and (iv) Body symmetry.

With the exception of body symmetry parameter, all other variables show direct correlation in their specific trends. The results demonstrate that the Monosaccate group (Plicatipollenites population) is characterized by a strong association between radial miospores, trilete/triletoid mark and radial body infold system. The whole group indicates a downward trend in time (regression). Contrarily, the mono-saccoid group (Potonieisporites population) is characterized by a strong association between bilateral miospores, monolete/monoletoid mark and bilateral infold system. The group indicates evolutionary progression and an upward rise in time.

The evolutionary aspects of the two populations have been discussed. The relative shift in the frequencies of the norms from Plicatipollenites to Potonieisporites across Talchir to Barakar times provides a means for broad biostratigraphical zonation.

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