| Shaximiao Formation | |
|---|---|
| Stratigraphic range: | |
 Excavation floor at the Zigong Dinosaur Museum | |
| Type | Geological formation |
| Unit of | Chongqing Group |
| Sub-units | Lower, Upper Subunits |
| Underlies | Suining Formation |
| Overlies | Xintiangou Formation |
| Thickness | Lower Subunit: Up to 246.5 m (809 ft) Upper Subunit: 450–1,200 m (1,480–3,940 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone, mudstone |
| Location | |
| Coordinates | 29°12′N 105°54′E / 29.2°N 105.9°E |
| Approximate paleocoordinates | 28°12′N 110°00′E / 28.2°N 110.0°E |
| Region | Sichuan |
| Country |  China |
| Extent | Sichuan Basin |
  Shaximiao Formation (China)  Shaximiao Formation (Sichuan) | |
The Shaximiao Formation (simplified Chinese: 沙溪庙组; traditional Chinese: 沙溪廟組 / 沙溪廟層; pinyin: Shāxīmiào zǔ) is a Middle to Late Jurassic aged geological formation in Sichuan, China, most notable for the wealth of dinosaurs fossils that have been excavated from its strata. The Shaximiao Formation is exposed in and around the small township of Dashanpu (simplified Chinese: 大山铺镇; traditional Chinese: 大山鋪鎮; pinyin: Dàshānpū zhèn), situated seven kilometres north-east from Sichuan's third largest city, Zigong, in the Da'an District.