Pairi Gr
Period:
Calymmian, Ectasian
Age Interval:
late Calymmian through Ectasian
Province:
Proterozoic S.India Khariar Basin
Type Locality and Naming
Named after the Pairi river running across the basin.
Lithology and Thickness
Sandstone and shale in two cycles. Upward succession of Devdahra Sandstone Fm conglomerate, Kulharighat Fm shale, Neor Fm clayey sandstone; then Galighat Sandstone Fm conglomerate-sandstone, Tarjhar Fm clayey sandstone and Ling Dongri Sandstone Fm
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Major unconformity on basement of granite gneiss and greenstone belts of the Bastar craton
Upper contact
Not given
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[82.74,20.14],[82.86,20.15],[82.83,20.21],[82.82,20.27],[82.88,20.36],[82.85,20.4],[82.74,20.4],[82.69,20.37],[82.65,20.31],[82.69,20.22],[82.73,20.21],[82.74,20.14]]]]}}
Fossils
Age
Age Span:
Beginning stage:
Calymmian
Fraction up in beginning stage:
0.75
Beginning date (Ma):
1,450.00
Ending stage:
Ectasian
Fraction up in the ending stage:
1.0
Ending date (Ma):
1,200.00
Depositional setting
Two cycles of alluvial fan/braid delta deepening into shallow tidal 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.