Pakistan Stratigraphy · stratigraphy.pk
Wakai limestone
https://stratigraphy.pk/formation/wakai-limestone
Wakai limestone
Paleocene
Balochistan Basin · Makran-Siahan Basin, Wazhdad Arc And Mashkel/Kharan Basin
Paleogene 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 Paleocene–Eocene reefal limestone at the base of the Makran sequence, before the deep-sea flysch took over.
Wakai limestone is named after Koh-i-Wakai in the valley of Tagrana Kaur (31 J/11; HSC, 1961). It consists of limestone, marl and shale. The age of formation is interpreted as Paleocene. The formation is important for petroleum prospecting and source, if it has large subsurface extension.
Significance. A Paleocene–Early Eocene reefal carbonate at the base of the Makran succession, recording shallow-marine conditions before the onset of deep-marine flysch deposition in the accretionary wedge.
- Lithology
- Limestone, marl and shale (reefal in part).
- Type locality
- Koh-i-Wakai, Tagrana Kaur valley
- Basin
- Balochistan Basin
- Region
- Makran-Siahan Basin, Wazhdad Arc And Mashkel/Kharan Basin
- Environment
- shallow marine, reef
- Introduced by
- HSC (1961)
- Economic importance
- Identified as a potential petroleum source/reservoir carbonate in the Makran if it has significant subsurface extent.
Provinces
References
- Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
- Cromie, P. et al. (2022). Tectonostratigraphic Evolution and Hydrocarbon Prospectivity South of Gwadar Bay, Makran Accretionary Wedge, Offshore SW Pakistan. (petroleum-system study).
Reviewer confidence: medium
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