Ngile Fm
Period:
Jurassic
Age Interval:
late Jurassic
Province:
Bhutan
Type Locality and Naming
Tethyan Himalaya
Lithology and Thickness
Dark-gray to black, brown-weathering, carbonaceous shale, and brown sandstone. Martin (2017) has implied facies correlation to Spiti Fm shale.
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Conformable (?) onto Chebesa Fm
Upper contact
Late Quaternary glacial and alluvial
Regional extent
GeoJSON
null
Fossils
Age
Implied by correlation diagram of Martin (2017) to be equivalent to the Spiti Fm shales (Nupra Fm) of Nepal, so same age-span is used.
Age Span:
Beginning stage:
Oxfordian
Fraction up in beginning stage:
0.3
Beginning date (Ma):
159.51
Ending stage:
Tithonian
Fraction up in the ending stage:
0.5
Ending date (Ma):
146.17
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.