Ripakha Fm
Period:
Carboniferous
Age Interval:
earliest Carboniferous
Province:
Bhutan
Lithology and Thickness
Tang Chu Gr are limestones, shales and dolostones. Schematic diagram of Martin (2017) suggests this upper formation is equal proportions of shales and limestones.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Conformable (?) over Wachi La Fm
Upper contact
Disconformably overlain by the Barshong Fm (?) or Shodug Fm
Regional extent
GeoJSON
null
Fossils
Age
Early Carboniferous implied by diagram of Martin (2017)
Age Span:
Beginning stage:
Tournaisian
Fraction up in beginning stage:
0.3
Beginning date (Ma):
355.53
Ending stage:
Tournaisian
Fraction up in the ending stage:
1.0
Ending date (Ma):
346.73
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.