Pakistan Stratigraphy · stratigraphy.pk
Baroghil group
https://stratigraphy.pk/formation/baroghil-group
Baroghil group
Ordovician–Silurian
Karakoram-Hindukush Basin · Central Karakoram Batholith
Ordovician–Silurian 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.
An Ordovician–Silurian sequence (the Yarkhun and Vidiakot formations) above the Ishkarwaz Granite at Baroghil Pass.
Baroghil group was named by Tahirkheli (1982) after the Baroghil pass, exposed in the Yarkhun valley, and south of Baroghil pass in Chitral district. Talent et al. (1999) have divided it into lower Yarkhun formation and upper Vidiakot formation.
Significance. The lower Paleozoic platform sequence (Ordovician–Silurian) that unconformably overlies the pre-Ordovician Ishkarwaz Granite south of the Baroghil Pass; it is divided into the lower Yarkhun Formation and the upper Vidiakot Formation (Talent et al., 1999) and carries Early Ordovician acritarchs and Middle–Late Ordovician conodonts. It is overlain with angular unconformity by the Devonian Chilmarabad Formation.
- Lithology
- Basal chert-rich conglomerate and arkosic sandstone with brachiopods, overlain by slate with metadolomite and quartzite.
- Type locality
- Baroghil Pass, Yarkhun valley, Chitral district
- Basin
- Karakoram-Hindukush Basin
- Region
- Central Karakoram Batholith
- Environment
- marine
- Introduced by
- Tahirkheli (1982)
Fossils
Provinces
References
- Talent, J. A. et al. (1999). Lower Palaeozoic of the Baroghil, Chitral; Yarkhun (Silurian) and Vidiakot (Ordovician) formations.
- Malkani, M. S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Memoir of the Geological Survey of Pakistan, Vol. 24.
- 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.
Reviewer confidence: medium
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