[en] The southwestern part of Cuddapah Basin consists of two distinct types of rocks, i.e. lower arenaceous and upper calcareous, which are termed as Gulcheru quartzite and Vempalle formation. Results of field and subsurface exploration revealed two repeated sedimentary sequences of arenaceous-argillaceous-carbonate units in Papaghni Group. These sequences represent marine transgression and regression cycles in Papaghni Group. Field characteristics of conglomerate (Vempalle Conglomerate), observed above massive dolostone in lower part of Vempalle Formation, show extra-formational and polymictic nature. Subsurface exploration in Tumallapalle and extension areas has also proved continuity of Vempalle conglomerate over 25 km along strike and 3.10 km along downdip direction. Secondly, the gradational contact was observed between Gulcheru shale and massive dolostone in surface exposures, which was also confirmed in one borehole (BH No. TPL-II/83) drilled more than a kilometer vertical depth. The strike and dip continuity (of Vempalle conglomerate) and gradational contact (in Gulcheru) have given a new understanding to the stratigraphic position of rock sequence in Papaghni Group. In the present study, it is proposed to revise the stratigraphic succession by placing carbonate unit of massive dolostone as a part of Gulcheru Formation, and Vempalle Formation would commence with the Vempalle conglomerate. (author)