Nalla Gutta Sandstone Fm
Period:
Calymmian
Age Interval:
late Calymmian
Province:
Proterozoic S.India Pranhita-Godavari west basin
Type Locality and Naming
Lower formation (1 of 4) of Pengnaga Gr. Named after the Nalla Gutta section exposure.
Lithology and Thickness
Conglomerate and sandstone. Thick wedges of red to purplish conglomerate, pebbly sandstone, and arkose, organized into successive coarsening up sequences.
Lithology Pattern:
Conglomerate
Relationships and Distribution
Lower contact
Unconformity on Rajaram Fm at top of Mulag Gr
Upper contact
Overlain by Pranhita Sandstone Fm
Regional extent
Approximately coeval with Somandevra Quartzite Fm (beach sands) in Pranhita-Godavari east basin
GeoJSON
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Fossils
Age
Age Span:
Beginning stage:
Calymmian
Fraction up in beginning stage:
0.75
Beginning date (Ma):
1,450.00
Ending stage:
Calymmian
Fraction up in the ending stage:
1.0
Ending date (Ma):
1,400.00
Depositional setting
Interpreted as alluvial fan to braid plain deposits in a fault-controlled setting.
Depositional pattern:
Additional Information
Compiler:
From: Saha D. (Dilip), Patranabis-Deb, S., and Colllins, A.S. (2016) Proterozoic stratigraphy of southern Indian cratons and global context. In: Stratigraphy & Timescales, 1: 1-59.