Roxby Formation
| Roxby Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Group |
| Underlies | Sherwood Sandstone Group |
| Overlies | Appleby Group |
| Thickness | up to 1,025 metres (3,360 ft) |
| Lithology | |
| Primary | Mudstone and siltstone, reddish brown, with subordinate sandstone. |
| Location | |
| Region | England |
| Country | United Kingdom |
| Extent | east England |
| Type section | |
| Named for | Roxby, North Yorkshire |
The Roxby Formation, previously known as the Permian Upper Marls, is a formation from the Guadalupian-Early Triassic of eastern England (formation dies out at Nottinghamshire). The formation is made up largely of mudstone and siltstone, reddish brown, with subordinate sandstone.