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A stratigraphic problem in most Gondwana basins in peninsular India has persisted for more than a century. Originally, in the type area of Damodar valley, the stratigraphy was established based on the order of superposition without the aid of fossils. However, fossils were used to classify the Gondwana succession into Lower Gondwana (Early Permian to Late Triassic), characterized by Glossopteris flora (considered to have become extinct by the end of Triassic), and Upper Gondwana, which has Ptilophyllum flora (Jurassic). The problem started as the work extended further outside the type area, where Glossopteris flora was discovered in Upper Gondwana rocks...

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