Middle Kali Gandaki Gr
Period:
Statherian, Calymmian
Age Interval:
late Statherian to early Calymmian
Province:
Nepal Lesser Himalaya
Type Locality and Naming
Tansen and lower Kali Gandaki region.
Lithology and Thickness
See individual formations; stromatolite-rich limestone to shale to sandstone. Upward succession of Heklang Fm, Virkot Fm, Chappani Fm, Khoraidi Fm, Saidi Khola Fm, Ramdighar Fm and Kerabari Fm (all in a ca. 100 Myr interval).
Lithology Pattern:
Sandy limestone
Relationships and Distribution
Lower contact
Upper contact
Underlies the Ramdighat Fm black claystone then dolomite at the base of the Upper Kali Gandaki Gr.
Regional extent
The Upper Kali Gandaki Group is distributed primarily between the Kali Gandaki River and the north slopes of the Mahabharat Range (ca. 27.8N, 83.6E – overlapping and eastward of the Tansen Gr exposure region.
GeoJSON
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Fossils
Age
Martin (2017) schematically suggests late Statherian to early Calymmian
Age Span:
Beginning stage:
Statherian
Fraction up in beginning stage:
0.75
Beginning date (Ma):
1,650.00
Ending stage:
Calymmian
Fraction up in the ending stage:
0.2
Ending date (Ma):
1,560.00
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Descriptions from Megh Raj Dhital (2015, Geology of Nepal: Regional Perspective of the Classic Collided Orogen, Springer Publ., 499 pp.). Age spans estimated from correlation diagrams in Martin, A.J. (2017, "A review of Himalayan stratigraphy, magmatism, and structure", Gondwana Research, 49: 42-80; http://dx.doi.org/10.1016/j.gr.2017.04.031), but these are often controversial.