Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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An unusual occurrence of magnetite pebbles of variable shapes and sizes is recorded in the matrix supported conglomerate band exposed around Silpunji, in the eastern part of Sundargarh district, Orissa. The metasediments (Chandiposh Group) with which the paraconglomerate band is associated, is intruded by 2809±12 Ma old Tamperkola Granite which suggests the conglomerate to be of Archaean period. Although Koira (Iron Ore) Group is very close to the Chandiposh Group, it is unlikely to be the source area for the magnetite pebbles, as Banded Iron Formation of Koira (Iron Ore). Group is dominantly haematitic in composition. The magnetite pebbles thus indirectly suggest the existence of a rock sequence other than Koira (Iron Ore) Group having iron ore bearing lithogic unit.
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