Grantham Formation
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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]
Unit ofInferior Oolite Group
UnderliesLincolnshire limestone
| Grantham Formation | |
|---|---|
| Stratigraphic range: | |
Sproxton Quarry, a Reference Section for the Grantham Formation | |
| Type | Geological formation |
| Unit of | Inferior Oolite Group |
| Underlies | Lincolnshire limestone |
| Overlies | Northampton Sand Formation, Whitby Mudstone Formation |
| Thickness | 2 to 5 m, locally 15 m in channels |
| Lithology | |
| Primary | Mudstone |
| Other | Sandstone |
| Location | |
| Region | England |
| Country | United Kingdom |
It is found from the Humber estuary to the Kettering/Peterborough area.