Lingshi Gr
Period:
Jurassic
Age Interval:
Middle and Late Jurassic
Province:
Bhutan
Type Locality and Naming
Tethyan Himalaya. Formalized by Tangri and Pande (1995).
Lithology and Thickness
Lower part is dark-gray, tan weathering shale, and fine-grained sandstone; Upper part is dark-gray to black, brown-weathering, carbonaceous shale, and brown sandstone (Gansser, 1983).
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Unconformity (spanning middle Permian through early Jurassic) onto the Shodug Fm
Upper contact
Late Quaternary glacial and alluvial
Regional extent
GeoJSON
null
Fossils
Age
Martin (2017) indicates an equivalence with the Bagung Fm through Spiti Fm (Nupra Fm) of Nepal, which are Middle to Late Jurassic. Same age span used here.
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.2
Beginning date (Ma):
170.35
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.