| Grantham Formation | |
| Period: | Aalenian |
| Type: | Geological formation |
| Prilithology: | Mudstone |
| Otherlithology: | Sandstone |
| Unitof: | Inferior Oolite Group |
| Underlies: | Lincolnshire limestone |
| Overlies: | Northampton Sand Formation, Whitby Mudstone Formation |
| Thickness: | 2 to 5 m, locally 15 m in channels |
| Region: | England |
The Grantham Formation is a geological formation in England, which dates to the Middle Jurassic Aalenian age around 172 million years ago. It is composed of mudstones and sandstone, usually with abundant plant debris. It overlies the preceding Northampton Sand Formation and underlies the following Lincolnshire Limestone.[1]
It is found from the Humber estuary to the Kettering/Peterborough area.