Phuentsholing Fm
Period:
Cambrian
Age Interval:
late Cambrian
Province:
Bhutan
Type Locality and Naming
Lesser Himalaya
Lithology and Thickness
Dark-gray to black, finely-laminated slate and phyllite, interbedded with thin- to medium-bedded, gray to tan limestone, thin-bedded, tan to dark-brown, fine- to medium-grained quartzite, and creamy gray dolostone (Bhargava, 1995; Tangri, 1995a). Maximum exposed thickness is ca. 2,250 m near Phuentsholing.
Lithology Pattern:
Shallow-marine marl
Relationships and Distribution
Lower contact
Conformably (?) overlies the Manas Fm conglomerates with dolomite
Upper contact
Major unconformity (Ordovician through Carboniferous are absent) below the Diuri Fm (western Bhutan) or Rangit Fm (eastern Bhutan)
Regional extent
GeoJSON
null
Fossils
Age
Late Cambrian
Age Span:
Beginning stage:
Guzhangian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
500.50
Ending stage:
Cambrian Stage 10
Fraction up in the ending stage:
1.0
Ending date (Ma):
486.85
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.