| Kojarena Sandstone | |
| Type: | Geological formation |
| Period: | Bajocian |
| Prilithology: | Sandstone |
| Otherlithology: | Claystone |
| Region: | Western Australia |
| Country: |  Australia |
| Unitof: | Champion Bay Group |
| Underlies: | Yarragadee Formation |
| Overlies: | Newmarracarra Limestone |
| Thickness: | Up to 34m (112feet) |
| Extent: | Perth Basin |
The Kojarena Sandstone is a Middle Jurassic geologic formation from Australia. It consists of red-brown, medium- to coarse-grained ferruginous sandstone, with a basal claystone.