Pakistan Stratigraphy · stratigraphy.pk
Drazinda Formation
https://stratigraphy.pk/formation/drazinda-formation
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.
The topmost Eocene marine clay of the Kirthar Group, capped by the unconformity beneath the continental molasse.
Named after Drazinda area. Upper unit of Kahan Group in southernmost Kohat. Records regression from marine conditions. Part of the Kahan Group.
Significance. The youngest unit of the Eocene Kirthar Group in the Sulaiman Range; its clays and marls are unconformably overlain by the Oligocene molasse, marking the end of marine deposition.
- Lithology
- Brown to grey clay with subordinate fossiliferous marl and limestone interbeds and, in the middle part, grey calcareous sandstone; locally with celestite nodules in the north.
- Thickness
- 15–500 m
- Type locality
- Northeast of Drazinda
- Environment
- marine
- Introduced by
- Hemphill et al. (1973)
- Economic importance
- Hosts celestite (strontium sulphate) nodules in the northern Sulaiman Range.
Fossils
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.
Reviewer confidence: high
Related units
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