Jagadalpur Fm
Period:
Stenian
Age Interval:
Early Stenian
Province:
Proterozoic S.India Indravati Basin
Lithology and Thickness
Calcareous shale with some volcanic tuffs (Fig – image B).
[Figure: Indravati basin field photographs illustrating lithology and sedimentary structures in different formations. (A) Tiratgarh Fm (Chitrakot Sandstone Member) - laterally persistent wavy bedded mature quartz arenite. (B) Jagadalpur Fm - Birsaguda tuff. (from Saha et al., 2016)]
Lithology Pattern:
Pelagic marl
Relationships and Distribution
Lower contact
Underlain by Kanger Fm limestone; but potentially with a large stratigraphic gap.
Upper contact
Not given
Regional extent
GeoJSON
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Fossils
Age
UePb isotopic analyses (LA-ICPMS) of the zircons from the Birsaguda tuff (Fig. –image B), within the Jagdalpur Formation point to closure of the basin at 1001 +/-7 Ma (Mukherjee et al., 2012).
Age Span:
Beginning stage:
Stenian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
1,200.00
Ending stage:
Stenian
Fraction up in the ending stage:
0.25
Ending date (Ma):
1,150.00
Depositional setting
Offshore muddy shelf
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.