A REAPPRAISAL OF THE STRATIGRAPHY OF BAILADILA-GROUP, BACHELI, BASTARDISTRICT, MP

The metasedimentary sequence of Bailadila Group exposed in Bacheli are a, sooth Bastar is studied in detail. Based on field relations, struct ural disposition, conglomerate occurrence and petrographic characters, Bailadila Group is divided into three Subgroups, which in turn compri se five formations. Formal stratigraphic formations identified are nam ely, Bhansi metabasalt-metapelite, Bacheli metasiliciclastic, East Rid ge shale, Loa conglomerate and shale and Kailash Nagar Iron Formation. Based on the stratigraphic continuity, the metabasalt-metapelite asso ciation (Bengpal) underlying the feldspathic quartzite (Bacheli metasi liciclastic-Bailadila) is proposed to be included as basal formation o f Bailadila Group. Further, high La(N)/Yb(N)(10.41 - 15.89) ratio and Eu/Eu (0.56-0.64) negative anomalies suggest a sialic continental cru st. It is also proposed that metavolcanic-elastic association at Chand enar and Tulsi Dongar being similar in lithoassociation to the propose d Bhansi Formation should also be considered of Bailadila Group.