Tang Chu Gr
Period:
Devonian, Carboniferous
Age Interval:
latest Devonian-earliest Carboniferous
Province:
Bhutan
Type Locality and Naming
Tethyan Himalaya. Late Devonian-Early Carboniferous Wachila and Ripakha Formations comprise the Tang Chu Group (Tangri and Pande, 1995).
Lithology and Thickness
Limestones, shales and dolostones. Combined Thang Chu Gr and underlying Pele La Gr are ca. 2 km thickness.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Disconformity onto Pele La Gr (PeleLaQuartzite Fm)
Upper contact
Disconformably overlain by the Barshong Fm (?) or Shodug Fm
Regional extent
GeoJSON
null
Fossils
Age
Latest Devonian to early Carboniferous implied by diagram of Martin (2017), which is shown as coeval with Tilcho Lake Fm of Nepal
Age Span:
Beginning stage:
Famennian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
365.20
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.