Tectonic Framework of Sedimentation in the Western Part of the Palnad Basin, Andhra Pradesh

The lithologic character of sediments, geometry and sedimentary characters of the formations belonging to the Palnad Basin have been taken into consideration in interpreting the probable tectonic framework of sedimentation and tectono-environmental classification of sedimentary formations in the western part of the Palnad basin. The Banganpalli quartzites were deposited in the littoral to infra-littoral environment under stable shelf conditions. The Narji limestones were deposited in infra-littoral to neritic environment under stable shelf conditions. Due to uplift the environment changed to infra-littoral and quiet water environment, when the Auk shales were deposited. The Paniam quartzites were deposited in the littoral to infra-littoral environment under stable shelf conditions with minor tectonic instability in certain local areas where positive elements were active during the uplift of the basin. The Kundair limestones and shales were deposited in neritic zones under reducing environment on stable shelf.