Source provenance

Majeed, K.U., Mughal, M.S., Tan, X.-J., Criniti, S., Civitelli, M., Siddique, K., Tirmazi, S.Z.S., Baig, M.S. & Critelli, S. (2025). Petrological and stratigraphical investigations of newly discovered phosphatic microfossils from the Sirban Formation, Hazara Basin, North Pakistan: Unveiling the late Sinian to middle Cambrian ecosystem. Journal of Palaeogeography, 14(4), 100288.

Cited by 1 unit (1 published) · 0 field-level citations · 5 revision notes.

Petrography, microfacies and biostratigraphy of the Sirban Formation (the Sirban dolomite/limestone of the Abbottabad Group; type area Sirban Hill), Hazara Basin, ~250 m studied. Four lithofacies (fossiliferous limestone, dolomitic limestone, fossiliferous chert, stromatolitic brecciated/banded chert) and microfacies (biosparite, dolostone-oomicrite, microcrystalline chert-mudstone, hematite-bearing chert) record high-energy shoreline to stable marine-shelf deposition in the Proto-Tethys Ocean (post-Rodinia). Reports Cambrian trilobites (Ptychoparia striata, Olenoides, Asaphiscus, Protolenus, Redlichia) and phosphatic microfossils, and - as an extraordinary new claim - Ediacaran-type soft-bodied taxa (Dickinsonia, Kimberella, Hallucigenia) said to mark a Precambrian-Cambrian paraconformity for the first time; the authors interpret the formation as late Sinian (Ediacaran) to middle Cambrian and argue prior blanket 'Cambrian' assignment lacked stratigraphic/taxonomic justification. Dolomitic-limestone porosity noted as a potential hydrocarbon reservoir. Open access (CC BY-NC-ND).

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Units citing this source

• Paleozoic Abbottabad Formation Cambrian
  • Lithology: Majeed et al. (2025), on the Sirban Formation (the Sirban dolomite/limestone of the Abbottabad Group; type area Sirban Hill), ~250 m studied in the Hazara Basin: four lithofacies - fossiliferous limestone, dolomitic limestone, fossiliferous chert, and stromatolitic brecciated/banded chert - with biosparite (bioclast packstone-grainstone), dolostone-to-oomicrite, microcrystalline chert-mudstone and hematite-bearing chert microfacies. These record deposition from high-energy shoreline to stable marine shelf in the Proto-Tethys Ocean following the breakup of Rodinia.
  • Fossils: Majeed et al. (2025) report from the Sirban carbonates Cambrian trilobites (Ptychoparia striata, Olenoides, Asaphiscus, Protolenus, Redlichia) and phosphatic microfossils. The generic 'Stromatolites / Trace fossils' fossil list is retained; these taxa are recorded here as newly reported by a single study.
  • Age: Majeed et al. (2025) interpret the Sirban Formation as spanning the late Sinian (Ediacaran) to the Middle Cambrian - extending the curated 'Cambrian' age downward into the Ediacaran - and argue that earlier blanket assignment 'to the Cambrian' lacked sufficient stratigraphic or taxonomic justification. Recorded as this study's interpretation; the curated Cambrian age is retained pending corroboration.
  • Fossils: EXTRAORDINARY CLAIM, recorded but NOT adopted: Majeed et al. (2025) report Ediacaran-type soft-bodied taxa - Dickinsonia, Kimberella and Hallucigenia - which they say mark the Precambrian-Cambrian paraconformity in the Hazara area for the first time. Ediacaran body fossils in Pakistan would be a highly significant, singular claim; it is noted here as attributed to this study only and is not entered into the unit's fossil list pending independent confirmation.
  • Economic importance: Majeed et al. (2025): diverse porosity in the dolomitic limestone of the Sirban Formation indicates a potential hydrocarbon reservoir, and the unit carries phosphatic intervals/microfossils - consistent with the phosphate horizons already noted for the Abbottabad Formation.