In the Singhbhum district of Bihar (eastern India) there is a prominent band of metamorphosed basaltic rocks (known as Dalma volcanics) in a complex Archean terrain. Its outcrops were interpreted as the core of a regional syncline and, accordingly, a stratigraphic sequence was erected. We question this interpretation and show by both geological and geophysical investigation that this basaltic band does not occupy the core of a syncline but instead forms a sheet in the folded Archean sequence. On this basis, the stratigraphic sequence is revised.

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