| Stanwell Park Claystone | |
| Period: | Triassic |
| Age: | Early-Mid Triassic ~ |
| Type: | Geological formation |
| Otherlithology: | Sandstone |
| Unitof: | Narrabeen Group |
| Underlies: | Scarborough Sandstone |
| Overlies: | Bulgo Sandstone |
| Thickness: | up to 79m (259feet) |
| Region: | New South Wales |
| Extent: | Sydney Basin |
| Namedfor: | Stanwell Park, New South Wales |
| Location Ts: | Illawarra |
| Country Ts: | Australia |
| Thickness Ts: | 79 |
Stanwell Park Claystone is a geologic formation in the Sydney Basin in eastern Australia. Commonly seen in the Illawarra region, this stratum is up to 79 metres thick. Formed in the early Triassic, it is part of the Narrabeen Group of sedimentary rocks.This formation includes red, green and grey shale with quartz-lithic sandstone.[1] [2]