Field and laboratory investigations of the Deccan Trap basalt flows around Sagar and Katangi, central India, show that the lava flows and interbedded sedimentary rocks can be identified and correlated over distances up to 160 km by such physical properties as primary structures, weathering, thickness, and hand-specimen petrography, and then be considered as a part of the same stratigraphic sequence in distant outcrops.

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