Rangrik Fm
Type Locality and Naming
Type section is Near Rangrik. [Original Publication: Bhargava, O.N., Krystyn, L., Balini. M., Lein, R. and Nicora, A. 2004. Revised Litho- and Sequence Stratigraphy of the Spiti Triassic. Albertiana (Supplement), 30: p. 21-38.]
Synonyms: Sanglung C (Bhargava, 1987); lower Nimoloksa Gr.; lower Zozar Fm. It equals the classic Juvavites Beds.
[Figure: Zanskar-Spiti-Kumaun region location (provided by Om Bhargava)]
[Figure 0: History of Triassic lithostratigraphic nomenclature of Spiti (after Bhargava et al., 2004)]
Lithology and Thickness
Limestone to Sandstone. Limestone dominated with little marl, siltstone. Upper part comprises siltstone and in part iron-oolitic sandstone. 160 m (Lower Member 60m; Upper Member 110 m)
[Figure 1: Stratigraphic log of the Rangrik Formation (type section), N of Gechang and E of Lalung, Spiti (after Bhargava et al., 2004)]
Relationships and Distribution
Lower contact
Lower contact with the Rongtong Fm is conformable to sharp.
Upper contact
Gradational contact with the overlying Hangrang Fm is rather sharp.
Regional extent
Zanskar-Spiti and Himachal Pradesh to Kumaun-Garhwal region of Northwest Tethyan Himalaya
GeoJSON
Fossils
Juvavites aff. ehrlichi, Anatomites aff. melchioris, Tibetites cf. ryalli
Age
Depositional setting
Low to moderate energy with occasional high energy to even circa-littoral environments (Bhargava, 2008).
Additional Information
It equals the classic Juvavites Beds.