Tilicho Pass Fm
Period:
Age Interval:
Devonian
Province:
Nepal Tethyan Himalaya
Type Locality and Naming
late Devonian
Tilicho Pass Fm (Bodenhausen et al., 1964; Colchen et al., 1986)
Lithology and Thickness
Gray to dark gray mudrocks containing quartzarenite and carbonate intervals.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Overlying "a nautiloid-bearing oolitic ironstone horizon which represents a major "flooding surface related to a regional or even worldwide drowning episode", which is underlain by Late Devonian (Frasnian?) biocalcarenites; then, below, is the Muth Fm (Muth Quartzite Fm)
Upper contact
Disconformably (?) overlain by Tilicho Lake Fm (earliest Carboniferous)
Regional extent
GeoJSON
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Fossils
"yielding conodonts still of Frasnian age (Fuchs et al., 1988)."
Age
Late Devonian
Age Span:
Beginning stage:
Frasnian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
375.00
Ending stage:
Famennian
Fraction up in the ending stage:
0.5
Ending date (Ma):
365.20
Depositional setting
Depositional pattern:
Additional Information
A major transgressive episode recorded in Himalaya following the Muth Fm quartzite sandstone.
Compiler:
Extracted from Garzanti (1999, "Stratigraphy and sedimentary history of the Nepal Tethys Himalaya passive margin", Jour. Asian Earth Sci., 17: 805-827]