Dangar Fm
Type Locality and Naming
"Cariou et al. (1994) identified locally in the Thakkhola Graben a strongly lenticular unit [Dangar Formation], less than 10 m thick and consisting of grey marls and limestones yielding very rare ammonites of late Callovian age, lying between the Ferruginous Oolite Fm. below and the Spiti Shale [= Nupra Fm] above."
Lithology and Thickness
Pelagic marl. Gray marl and limestone, less than 10 m.
Relationships and Distribution
Lower contact
Overlies a Ferruginous Oolite Fm widespread marker unit.
Regional extent
"Strata of similar age and lithology, reaching up to 60 m in thickness, also occur in S. Tibet (Jadoul et al., 1998)."
GeoJSON
Fossils
Rare ammonites of late Callovian
Age
Depositional setting
" Another major gap spanning the late Callovian to early Bathonian is recorded at the top of the Ferruginous Oolite Fm in large parts of the Tethys Himalaya (e.g. Bassoullet et al., 1986; Westermann and Wang, 1988), but locally both in the Thakkhola Graben and in S. Tibet this time interval is represented by a markedly lenticular pelagic marly limestone unit (Dangar Fm). Rapid lateral variations in thickness are consistent with a mid-Jurassic block-faulting event,
probably related to rifting of India-Madagascar from Africa in the west and of the N.W. Australia margin in the east (Scotese, 1991), followed by seafloor spreading in the Somali, Mozambique and Argo basins."
Additional Information