Paleozoic • Permian

Chidru Formation

Late Permian (Changhsingian)

Stratigraphic position

In the Salt Range column

Shale / mudLimestoneSandstoneFossils recordedConformableUnconformity

Band colour = period; texture = dominant rock type. Lines between bands mark the contact type (wavy = unconformity inferred from a missing period). 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.

Terminal Permian sequence containing the Permian-Triassic boundary. Records the greatest mass extinction in Earth history. Part of the Zaluch Group.

Significance. Records end-Permian mass extinction; critical section for P-T boundary studies; dramatic faunal turnover

Lithology: Grey to greenish sandstone, siltstone, limestone
Thickness: 60-120 m
Type locality: Chhidru, Salt Range

Fossils

Last Paleozoic brachiopodsAmmonoidsDiminished fauna near top

Provinces

Salt Range Kohat Basin Potwar Basin

Related units

Below · older

Wargal Limestone

Permian

Above · younger

Mianwali Formation

Triassic