インドの下部ゴンドワナ系におけるグロッソプテリス植物群の発達と関連した主要な花粉学的傾向
スポンサーリンク
概要
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Palynological studies of Permian sequence pertaining to Glossopteris flora provide a model for biostratigraphic zonation and correlation in different basins. The major episodes of changes in palynocomplexes through Permian time are determined on the basis of appearance and proliferation of various pollen morphotypes, e.g., monosaccate, bisaccate, nonsaccate sulcate, striate, non-striate and taeniate forms. A comparative assessment of such palynofloral patterns in relation to megafloral occurrences of various morphological groups of leaf genera from the Talchir Formation (Late Asselian of Early Permian) to Raniganj Formation (Late Permian) has been made. It has been found that there exists a group correlation in mega- and microfossil diversities although paucity of in-situ spores and pollen does not allow a precise tagging of forms. The relationship of these groups surmised are-(1) monosaccate pollen with leaves without midrib and with meshes, (2) nonstriate bisaccates with leaves with midrib and narrow meshes, (3) striate bisaccates with leaves with midrib and medium/broad meshes, (4) nonsaccate nonstriate sulcates with leaves without meshes and midrib, and (5) nonsaccate striate sulcates with leaves without meshes but with midrib.
- 2002-12-20