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Data to determine new age constraints on the Ediacaran Salt Range Formation of Pakistan

April 10, 2026

The Neoproterozoic–Early Cambrian Salt Range Formation (SRF) of Pakistan is a sequence of salt, gypsum, marl, dolomite, fine-grained siliciclastic rocks (shale, siltstone and sandstone), oil shale, and hydrothermally altered extrusive volcanics. The formation occurs in the Salt Range physiographic feature, a mountain range rising 750 to 1000 m above alluvial plains of northwestern Pakistan, between the petroleum-producing Potwar Basin to the north and Punjab Platform to the south. We examined 12 SRF samples from 3 localities located over a distance of ~30 km in the eastern Salt Range at Sohan Nala (SN, 32.66176N, 72.72819E), Makrach Nala (MN, 32.64976N, 72.85527E), and Khewra Gorge (KG 32.64972N, 73.01246E). Samples included 7 thinly bedded SRF oil shales and 5 SRF marls comprised of clays and carbonates. Samples were analyzed by multiple approaches. Data from the analyses are included here in the following tables: Table S1 - X -ray diffraction (XRD) mineralogy Table S2.csv - Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry/Mass Spectrometry (LA-ICP-MS/MS) analysis Table S3 - Organic geochemical screening Table S4 - Elemental analysis and Organic ratios analysis on samples as received Table S5 - Reflectance measurements from organic petrographic analysis on solid bitumen and bituminite Tables S6 through S11 - One csv file reporting organic molecular data for 4 SRF oil shale, including SARA (saturate, aromatic, resin, asphaltene) fractionation and gas chromatography-mass spectrometry saturate and aromatic biomarker analysis Table S12 - Stable carbon and oxygen isotopic measurements on carbonate in select marl samples Table S13 - Qualitative Scanning Electron Microscopy-Energy Dispersive Spectroscopy compositions from the analysis of clay ovoids Table S14 - Sixty-one major and trace element concentrations for all samples Table S15 - Platinum Group Elements (PGE) from the analysis of 8 SRF oil shale and marl samples. Refer to the Data Quality section of the dataset's metadata for complete method and sample data descriptions.

Publication Year 2026
Title Data to determine new age constraints on the Ediacaran Salt Range Formation of Pakistan
DOI 10.5066/P1WRBPG6
Authors Paul C Hackley, Ryan McAleer, Jay M Thompson, Brett J Valentine, Imran Khan
Product Type Data Release
Record Source USGS Asset Identifier Service (AIS)
USGS Organization Geology, Energy & Minerals Science Center
Rights This work is marked with CC0 1.0 Universal
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