Pengnaga Gr
Type Locality and Naming
In the northern part of the western belt, the thick succession of sandstonee shaleelimestone unconformably overlying the gneissic basement around Adilabad has been classified as the Penganga Group as distinct from the Albaka Gr which lacks the carbonate facies; moreover, in contrast to dolomitic limestone or dolomites in the Mulug Gr, the Penganga Group includes a true platformal limestone. The Penganga succession can be traced right up to Ramgundam in the south and unconformable relationship with the Mulug Gr or the Mallampalli Gr has been recognized
Lithology and Thickness
Sandstone upward to limestone and claystone. Upward succession of Nalla Gutta Sandstone Fm, Pranhita Sandstone Fm, Chanda Limestone Fm, and Satnala Shale Fm. Cumulative thickness in excess of 1200 m around Adilabad.
Relationships and Distribution
Lower contact
Unconformity on Rajaram Fm at top of Mulag Gr
Upper contact
Unconformably overlain by Encharani Fm (conglomerate) at base of Sullavai Gr
Regional extent
Lower part is approximately coeval with Albaka Gr in Pranhita-Godavari east basin (as shown on Saha et al., 2016, chart)
GeoJSON
Fossils
Age
Depositional setting
Upward deepening from alluvial fan conglomerate to outer shelf shale with intermediate deep-water carbonate platform facies
Additional Information