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Pakistan Stratigraphy

Basin

Makran-Siahan Basin (Arc-Trench Gap)

1 province · 13 formations

This reference records 13 units across 1 province of the Makran-Siahan Basin (Arc-Trench Gap), spanning 2 geological eras and most commonly sandstone, conglomerate, shale/mudstone.

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At a glance

13
units
1
province
2
eras
6
georeferenced
7
with fossils
13
type localities
5,000 m
max thickness
10
sources

Rock types

  • sandstone (4)
  • conglomerate (3)
  • shale/mudstone (3)
  • limestone (2)
  • metamorphic rocks (1)

Based on the primary lithology recorded for each unit; some units span more than one rock type.

Fossils recorded

  • Deep water foraminifera
  • Trace fossils
  • Foraminifera
  • Planktonic foraminifera
  • Benthic foraminifera
  • Mollusks
  • Bivalves (lamellibranchs)
  • Gastropods
  • Corals
  • Assilina mamilla
  • Fasciolites borealis
  • Discocyclina undulata
  • Lepidocyclina blanfordi
  • Lepidocyclina dilatata
  • Nummulites atacicus
  • Nummulites fichteli
  • Nummulites intermedius
  • Spiroclypeus sp.

Provinces

1

Makran Coast

13

Active accretionary prism

Stratigraphic column

The Makran-Siahan Basin (Arc-Trench Gap) units placed in age order (units without a resolvable age are omitted). Toggle readable vs true-scale, and use Download to export any section as SVG or PNG for a figure.

Makran-Siahan Basin (Arc-Trench Gap) — stratigraphic column
  1. Jiwani FormationFossils recordedQuaternary
  2. Kech FormationQuaternary
  3. Gwadar FormationQuaternary
  4. Parkini FormationFossils recordedNeogene
  5. Ormara FormationFossils recordedNeogene
  6. Chatti FormationNeogene
  7. Talar FormationNeogene
  8. Hinglaj FormationFossils recordedNeogene
  9. Panjgur FormationFossils recordedPaleogene–Neogene
  10. Hoshab FormationFossils recordedPaleogene-Neogene
  11. Siahan FormationFossils recordedPaleogene
  12. Wakai LimestonePaleogene
  13. Zurati FormationPaleogene
LimestoneConglomerateShale / mudSandstoneFossils recordedContact not recorded

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.

Units in this basin

13

Quaternary1

Cenozoic12