Source provenance

Hylland, M.D., Riaz, M. & Ahmad, S. (1988). Geology of the Southern Gandghar Range, Pakistan. Geological Bulletin, University of Peshawar, Vol. 21, pp. 1-14.

Cited by 5 units (4 published) · 17 field-level citations · 4 revision notes.

NCE Geology, Univ. of Peshawar / Oregon State. Full text reviewed (reviewer-supplied). Documents the probable-Proterozoic Manki-Shahkot-Utch Khattak-Shekhai succession of the southern Gandghar Range (correlative with the Attock-Cherat Range): type lithologies, thicknesses, and the conformable contact chain (Manki grades up into Shahkot; Shahkot -> Uch Khattak -> Shekhai all conformable). Manki correlated with the Hazara Formation; the thin Sobrah Formation near Tarbela Dam correlated with the Shekhai Formation (K.R. Pogue, pers. comm.).

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Units citing this source

• Precambrian Manki Formation Precambrian
  LithologyThicknessThickness (m)Type localityIntroduced byUpper contact (underlies)Depositional environmentGeological significance
• Precambrian Shahkot Formation Precambrian
  Lower contact (overlies)
  • Lower contact (overlies): Lower contact completed: the Shahkot Formation conformably (gradationally) overlies the Manki Formation; ~300 m thick, with a ~100 m fine- to medium-grained cherty basal limestone (white chert patches) passing up into laminated argillite/shale with a thin algal-limestone bed near the top.
• Precambrian Shekhai Formation Precambrian
  ThicknessThickness (m)
  • Thickness: Outcrop width implies a thickness of at least 300 m; the true thickness is uncertain because the top is either truncated by the Baghdarra fault or not exposed. A pink-and-white quartzite bed up to 1 m thick marks the base, conformable on the Uch Khattak Formation.
• Precambrian Sobrah Formation Precambrian under review
  EraPeriodAgeLithologyType localityLower contact (overlies)
  • Age: Characterised from Hylland, Riaz & Ahmad (1988): a thin limestone overlying the Manki Formation near Tarbela Dam, considered correlative with the Precambrian Shekhai Formation on lithologic grounds (K.R. Pogue, pers. comm.). This supersedes the baseline 'age not well established' note; kept under review because the correlation rests on a personal communication.
• Precambrian Uch Khattak Formation Precambrian
  • Geological significance: Contains a diagnostic intraformational conglomerate with clasts of both the Manki and Shahkot Formations, demonstrating that the Uch Khattak is younger than both; the same conglomerate is traced into the Attock-Cherat Range just west of the Indus River. Distinctive basal limestone (10-70 m) of bluish- to dark-gray carbonate in a wavy meshwork of brown clayey material, locally stromatolitic.