A Reappraisal of the Stratigraphy of Bailadila Group, Bacheli, Bastar District, M.P.

The metasedimentary sequence of Bailadila Group exposed in Bacheli area, south Bastar is studied in detail. Based on field relations, structural disposition, conglomerate ocurrence and petrographic characters, Bailadila Group is divided into three Subgroups, which in turn comprise five formations. Formal stratigraphic formationidentified are namely, Bhansi metabasalt-metapelite, Bacheti metasiliclastic, East Ridge Shale, Loa Conglomerate and shale Kailash Nagar Iron Formation. Based on the Stratigraphic continuity, the metabasalt-metapelite association (Bengpal) underlying the feldapathic quartzite (Bacheli metasiliciclastic-Bailadila) is proposed to be included as basal formation of Balladila Group.

Further, high L_aN/Y_bN(10.41-15.89(ratio and Eu/Eu* (0.56-0.64) negative anamolies suggest a sialic continental crust.

It is also proposed that metavolcania-clastic association at chandenar and Tulsi Dongar being similar in lithoassociation to the proposed Bhansi Formation should also be considered of Bailadila Group.