Shodug Fm
Period:
Carboniferous, Permian
Age Interval:
latest Carboniferous-early Permian
Province:
Bhutan
Type Locality and Naming
Tethyan Himalaya
Lithology and Thickness
In Lingshi region: brown, pebble-clast diamictite (Gansser, 1983) is equivalent to Shodug Formation (Permian-Carboniferous) of Tangri and Pande (1995). Martin (2017) schematic stratigraphic column suggests lower part is clay-rich, and upper part is coarser with pebbles. Combined Barshong Fm and Shodug Fm spans nearly 4 km!
Lithology Pattern:
Glacial till
Relationships and Distribution
Lower contact
Not given, but presumed to conformably (?) overly Barshong Fm limestone.
Upper contact
Disconformity (spanning late Permian through early Jurassic) to Lingshi Gr (Mo Chu Fm)
Regional extent
GeoJSON
null
Fossils
Age
Martin (2017) indicates equivalent to glacial-dominated Bangba Fm and Braga Fm of Nepal
Age Span:
Beginning stage:
Kasimovian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
307.02
Ending stage:
Artinskian
Fraction up in the ending stage:
0.5
Ending date (Ma):
286.91
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.