Pakistan Stratigraphy · stratigraphy.pk
Chichali Formation
https://stratigraphy.pk/formation/chichali-formation
Chichali Formation
Late Jurassic - Early Cretaceous
Jurassic-Cretaceous in the time scale →Stratigraphic position
Band colour = period; texture = dominant rock type. Lines between bands mark the contact type. True scale makes height ∝ recorded thickness; hatched = thickness not recorded. Ages approximate, for ordering.
This unit (highlighted) within its province column; faded ends continue above and below. Line style marks the contact type.
A greenish, glauconite-rich marine sandstone and shale marking the Jurassic-to-Cretaceous transition in the Upper Indus Basin.
Named after Chichali Pass in Surghar Range. Marks Jurassic-Cretaceous boundary. Rich in belemnites. Correlated with Spiti Shale of Hazara. Part of the Chichali Group.
Significance. A glauconitic marine sandstone-and-shale unit straddling the Jurassic–Cretaceous boundary in the Kohat–Potwar region; its glauconite and condensed character record slow marine sedimentation, and it underlies the Cretaceous Lumshiwal Formation.
- Lithology
- Dark greenish grey glauconitic sandstone, glauconitic shale
- Type locality
- Chichali Pass in Surghar
- Environment
- marine
- Introduced by
- Danilchik (1961)
- Economic importance
- Phosphorite (rock phosphate) has been reported from the Chichali Formation near Kohat, but low phosphate content makes it of little economic value.
Provinces
References
- Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
- Kazmi, A.H. & Jan, M.Q. (1997). Geology and Tectonics of Pakistan. Graphic Publishers, Karachi.
- Microfacies and biostratigraphy of the Chichali, Lumshiwal and Kawagarh formations, Upper Indus and Hazara basins, Pakistan (2024).
Reviewer confidence: medium
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