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Abstract

Understanding of the incompatibility of King’s three-fold classification of the Proterozoic (‘Purana’) rocks of the Pranhita–Godavari Valley, south India, and renewed mapping and stratigraphic studies, reveal that syn-depositional basin dynamics, with differential uplift and subsidence, was the major control on basin evolution and the development of multiple unconformity-bound successions. The unconformities demarcate six major successions, the Mallampalli/Devalmari, Somanpalli, Mulug, Penganga, Albaka and Sullavai groups, each with a very distinctive set of sedimentological attributes. There are at least five different conflicting classification schemes so far. The major problems in the classification of the succession appear to lie in the recognition of unconformities and unconformity-bound successions, and in stratigraphic nomenclature. Based on field geology, available age data and the concept of the megasequence, the Mallampali, Devalmari, Mulug and Somanpalli groups have been grouped into the Pakhal Supergroup. The question of combining the rest of the groups has been deferred until the resolution of the Albaka–Penganga relationship is achieved beyond doubt. The relationships between different stratigraphic units have been critically examined to reconstruct the stratigraphic history, events of sea-level change and palaeogeographical evolution.

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