Barshong Fm
Period:
Carboniferous
Age Interval:
Middle Carboniferous
Province:
Bhutan
Type Locality and Naming
Tethyan Himalaya
Lithology and Thickness
In Lingshi region: medium-gray, cliff-forming, thin-bedded, silt lamination-rich, fossiliferous limestone (Gansser, 1983) is equivalent to Barshong Formation of Tangri and Pande (1995). Combined Barshong Fm and Shodug Fm spans nearly 4 km!
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
Not given; but implied as disconformable (?) onto Ripakha Fm (upper Tang Chu Gr)
Upper contact
Not given; but implied as overlain conformably (?) by the Shodug Fm pebbly mudstone (glacial).
Regional extent
GeoJSON
null
Fossils
Age
Given extreme thickness, then presumed to span Middle Carboniferous
Age Span:
Beginning stage:
Serpukhovian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
330.34
Ending stage:
Moscovian
Fraction up in the ending stage:
1.0
Ending date (Ma):
307.02
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extract from Legend to "Geologic Map of Bhutan" (Long, S., McQuarrie, N., et al., 2011, Journal of Maps). 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.