Tarur Nala Fm
Lithology and Thickness
Volcanic ash and sandy claystone. A thick succession of ash beds and graywacke-shale grading to intercalated shale and limestone, with a basal succession of volcaniclastics, litharenite, and slumped shales (Fig. – images J and K). The ash beds laterally grade into bedded chert interstratified with siliceous black shale and thin beds of limestone. The graywacke beds are massive to normally graded, while the shales are plane laminated.
[Figure: Pranhita-Godavari valley basin Field photographs illustrating lithology and sedimentary structures. (H) Bodela Vagu Fm - Laminated lime mudstone. (I) Somnur Fm - Heterolithic sandstone-shale with profuse desiccation crack in-fills. (J) Tarur Nala Fm - Ash beds of Kotturu Somanpalli. (K) Tarur Nala Fm - Graywacke-shale turbidite with cherty intervals. (from Saha et al., 2016)]
Relationships and Distribution
Lower contact
Underlain by the Gutta Chert Fm
Upper contact
Overlain by Kopela Shale Fm
Regional extent
Approximately coeval with upper Enchencheruvu Chert and lower Rajaram Fm of Mulug Gr of Pranhita-Godavari west basin
GeoJSON
Fossils
Age
Depositional setting
Unstable shelf, slope to basinal deposit
Additional Information