An approach of understanding acid volcanics and tuffaceous volcaniclastics from field studies: A case from Tadpatri Formation, Proterozoic Cuddapah basin, Andhra Pradesh, India - Sukanta Goswami; P K Upadhyay; Sangeeta Bhagat; Syed Zakaulla; A K Bhatt; V Natarajan; Sukanta Dey (Journal of Earth System Science, 2018)