| Age |
Geological Units |
Lithological Composition |
| Holocene |
Recent alluvial deposits |
Different sized clastics, mixture of clay, sand & pebbles. |
| Pleistocene |
River Terraces |
Mixture of clay, sand & pebble. |
| Pliocene |
Bai Hassan & Muqdadiya Formation |
Thick sandstone, siltstone & conglomerate. |
| Late Miocene |
Injana Formation |
Massive beds of claystone & sandstone. |
| Middle Miocene |
Fatha Formation |
Alternation of sandstone, claystone, limestone & rare evaporation. |
| Middle-Late Eocene |
PilaSpi Formation |
Dolomitic limestone overlain by recrystallized & chalky limestone |
| Early Eocene |
Gercus Formation. |
Red mudstone, sandstone & shale, with rare conglomerate. |
| Paleocene |
Kolosh Formation |
Mainly clastics: shale, limestone, marl & mudstone. |
| Late Cretaceous |
Shiranish & Tanjero Formations |
Blue marl overlaying limestone & marly limestone. |
| Middle Cretaceous |
Aqra-Bekhme & Qamchuqa Formations |
Bituminous dolomitic limestone; massive organic limestone. |
