Sikkim Dolostone Fm
Period:
Calymmian
Age Interval:
early Calymmian
Province:
Bhutan
Type Locality and Naming
Lesser Himalaya
Lithology and Thickness
No details are given, but assumed to be dolomite.
Lithology Pattern:
Dolomite
Relationships and Distribution
Lower contact
Conformably (?) overlies the Pangsari Fm
Upper contact
Major unconformity (ca. 1 billion years!) below the Manas Fm of late Cambrian (Martin, 2017, diagram).
Regional extent
GeoJSON
null
Fossils
Age
Martin (2017) schematically indicates same age span as the entire Lakharpata Gr and other dolomite in Nepal Lesser Himalaya (Dhading Dolomite Fm through Malekhu Limestone Fm, and maybe Robang Phyllites) => lower third of Calymmian
Age Span:
Beginning stage:
Calymmian
Fraction up in beginning stage:
0.05
Beginning date (Ma):
1,590.00
Ending stage:
Calymmian
Fraction up in the ending stage:
0.3
Ending date (Ma):
1,540.00
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.