Cenozoic • Paleogene

Lockhart Limestone

Middle to Late Paleocene

Stratigraphic position

In the Salt Range column

SandstoneLimestoneShale / mudFossils recordedConformable

Band colour = period; texture = dominant rock type. Lines between bands mark the contact type. 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.

A grey Paleocene sea-floor limestone full of larger foraminifera, recording a marine flooding of the region above the Hangu sandstone.

Named after Fort Lockhart in Samana Range. Distinctive nodular limestone rich in larger foraminifera including type genus Lockhartia. Part of the Hangu Group.

Significance. A widespread Paleocene shallow-marine limestone — the middle, fully marine unit of the Makarwal Group; its larger-foraminiferal assemblage records the Paleocene marine transgression across the Kohat–Potwar–Hazara platform.

Lithology: Dark grey nodular (rubbly) limestone
Thickness: 30–240 m
Type locality: Near Fort Lockhart, Samana Range
Environment: shallow marine
Introduced by: Davies (1930)

Fossils

Operculina subsalsaMiscellanea miscellaMiscellanea stampiLockhartia haimeiLockhartia newboldiLepidocyclina punjabensisDiscocyclina ranikotensis

Provinces

Salt Range Hazara Basin Kohat Basin Potwar Basin

References

Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
Kazmi, A.H. & Jan, M.Q. (1997). Geology and Tectonics of Pakistan. Graphic Publishers, Karachi.

Reviewer confidence: high

Related units

Below · older

Hangu Formation

Paleogene

Above · younger

Patala Formation

Paleogene