Passu Slate
Permian (position between the Gircha Formation and Gujal Dolomite; no fossils reported)
Permian in the time scale →Cited in 1 source Last reviewed Aug 29, 2026
- Rank
- Not recorded
- Status
- Published
- Age
- Paleozoic · PermianPermian (position between the Gircha Formation and Gujal Dolomite; no fossils reported)
- Named by
- Not recorded
- Type locality
- Passu, Upper Hunza Valley, northern Karakoram (Gilgit-Baltistan).
- Thickness
- Not recorded
- Lithology
- Light to dark grey, thin- to medium-bedded slaty shale, slate and phyllitic slate with subordinate calcareous and arenaceous partings; splintery weathering; sporadically intruded by granite, diorite, dolerite, aplite and vein quartz.
- Synonyms
- Passu Slates; Misgar Slate
The Passu Slate is a thick slate succession of the Upper Hunza Valley forming much of the southwestern flank of the Sost Anticline. Tahirkheli et al. (1990) showed that the Passu Slate and the Misgar Slate (northern flank) are a single formation doubled by the Sost Anticline. It overlies the Pak-China Friendship Formation with a well-marked unconformity, underlies the Gujal Dolomite, and is intruded by the Karakoram Axial Batholith and the Khunjerab Igneous Complex. No fossils have been reported.
Fossils
Not recorded
Contacts
Band colour = period; texture = dominant rock type. Lines between bands mark the contact type; dotted = no contact recorded in the sources (not a claim of conformity). 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.
Distribution & setting
- Basin
- Not recorded
- Region
- Not recorded
- Depositional environment
- Not recorded
- Coordinates
- Not recorded
Correlation
Not recorded. Compare this unit against other basins on the correlation panel →
Economic significance
Not recorded
Remarks
Not recorded
Research notes (1)
Field-by-field findings drawn from the cited literature. Every statement is traced to a registered source — follow a citation for the full reference.
Lithology (1)
-
Tahirkheli et al. (1990): the Passu Slate (= Misgar Slate on the north flank; one formation doubled by the Sost Anticline) is light-to-dark grey, thin- to medium-bedded slaty shale, slate and phyllitic slate with subordinate calcareous/arenaceous partings, splintery weathering, sporadically intruded by granite/diorite/dolerite/aplite/vein quartz. Overlies the Pak-China Friendship Fm with a marked unconformity; intruded by the Karakoram Axial Batholith and Khunjerab Igneous Complex. No fossils reported.
Tahirkheli, R.A.K., Sun Dongli, Pan Yushang, Deng Wanming, Zhang Yuquan, Baqri, S.R.H. & Dawood, H. (1990)
Sources (1)
- Tahirkheli, R.A.K., Sun Dongli, Pan Yushang, Deng Wanming, Zhang Yuquan, Baqri, S.R.H. & Dawood, H. (1990). Review of stratigraphy of the Upper Hunza Valley (UHV), NW Karakoram, Pakistan. Geological Bulletin, University of Peshawar, 23, 203-214.
Reviewer confidence: low
Every fact on this page is source-cited. This entry is part of the peer-archived Pakistan Stratigraphy Dataset (doi.org/10.5281/zenodo.21363991, CC‑BY‑4.0).
Lexicon status: Defined in journal or other literature; not found in a GSP memoir. There is no body currently ratifying unit status, so provenance is shown in place of a formal ruling.
Cite this unit
Qudsi, L. (2026). Passu Slate. In Pakistan Stratigraphy Dataset [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21363991
@misc{stratigraphypk_passuslate,
author = {Qudsi, Lareb},
title = {{Passu Slate} --- Pakistan Stratigraphy Dataset},
year = {2026},
publisher = {Zenodo},
doi = {10.5281/zenodo.21363991},
url = {https://doi.org/10.5281/zenodo.21363991}
} Archived dataset: doi.org/10.5281/zenodo.21363991 (CC‑BY‑4.0) · Direct link to this entry: https://stratigraphy.pk/formation/passu-slate (accessed October 29, 2026).
Related units
Referenced in other successions
Overlain by Gircha Formation
More from Karakoram
Possible equivalents (shared name or synonym)
Same age (Paleozoic · Permian)
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