Chebesa Fm
Period:
Jurassic
Age Interval:
late-Middle to early-Late Jurassic
Province:
Bhutan
Type Locality and Naming
Tethyan Himalaya
Lithology and Thickness
Lower Lingshi Gr is Dark-gray, tan weathering shale, and fine-grained sandstone. No details given. Implies by schematic column of Martin (2017) that the upper-Lower Lingshi Gr is clay-dominated.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Conformable (?) on underlying Mo Chu Fm
Upper contact
Conformable (?) to overlying Ngile Fm
Regional extent
GeoJSON
null
Fossils
Age
Implied by correlation diagram of Martin (2017) to be equivalent to the clayey marl Ferruginous Oolite Fm of Nepal, so same age-span is used.
Age Span:
Beginning stage:
Bathonian
Fraction up in beginning stage:
0.7
Beginning date (Ma):
166.15
Ending stage:
Oxfordian
Fraction up in the ending stage:
0.3
Ending date (Ma):
159.51
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.