Studies in the Talchir flora of India - 10. Early and Late Talchir microfloras from the west Bokaro coalfield, Bihar

K.M. Lele

doi:10.54991/jop.1973.942

Authors

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

DOI:

https://doi.org/10.54991/jop.1973.942

Abstract

Two miofloral assemblages - one from the base and the other from the top of the Talchir Formation - are described from a single sequence in the Dudhi River, West Bokaro Coalfield. The impoverished nature of the early Talchir assemblage is reflected by very limited number and variety of taxa (8 genera & 14 species) - chiefly Parasaccites, Plicatipollenites and Potonieisporites and some apiculate triletes. Disaccates - especially Striatiti - are strikingly absent. Leiosphaeridia and spicule-like microfossils are significantly associated.

The late Talchir mioflora, on the contrary demonstrates distinct improvement both in diversity and quantity of miospores (14 genera & 29 species). Besides the stronghold of Parasaccites, Plicatipollenites and Potonieisporites, several genera make new appearance, viz., Jayantisporites, Tuberisaccites, Caheniasaccites, Limitisporites and especially all the striate disaccates like Crescentipollenites, Faunipollenites and Striatoparvisaccites gen. nov. A number of species are apparently represented only in the late Talchir. Leiosphaeridia are rare and spicule- like bodies are absent.

In the light of the present study, and from an assessment of the better known Talchir miofloras, it is suggested that not one but two miofloral assemblages of early and late Talchir age respectively - are evident in the Talchir Formation.

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