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The inner ramp facies of the Thanetian Lockhart Formation,western Salt Range,Indus Basin,Pakistan |
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| Authors: | Muhammad Hanif Muhammad Imraz Fahad Ali Muhammad Haneef Abdus Saboor Shahid Iqbal Sajjad Ahmad Jr |
| Institution: | 1. National Centre of Excellence in Geology, University of Peshawar, Peshawar, Khyber Pakhtunkhwa, Pakistan 2. Department of Geology, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan 3. Department of Geology, University of Peshawar, Peshawar, Khyber Pakhtunkhwa, Pakistan 4. Department of Earth Sciences, Quaid-i-Azam University, Islamabad, Pakistan |
| Abstract: | The Lockhart Formation from a major carbonate unit of the Paleocene Charrat Group in Upper Indus Basin, Pakistan represents a larger foraminiferal–algal build up deposited in a cyclic sequence of the carbonate ramp. The foraminiferal–algal assemblages of the Lockhart Formation are correlated here to larger foraminiferal biostratigraphic zone, i.e. Shallow Benthic Zone (SBZ3) of the Thanetian Age. Inner ramp lagoon, shoal and fore shoal open marine are three main facies associations represented by wackstone and packstone foraminiferal–algal deposits. These facies are present in a cyclic order and displayed a retrograding carbonate ramp indicating the Thanetian transgressive deposits associated with eustatic sea level rise. The correlation of the microfacies of the Lockhart Formation (Upper Indus Basin) and facies of the Dungan Formation (Lower Indus Basin) provide detailed configuration of the depositional setting of the Indus Basin during the time interval represented by the Thanetian Zone SBZ3. |
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