Lilstock Formation
| Lilstock Formation | |
|---|---|
| Stratigraphic range: Rhaetian ~ | |
| Type | Formation |
| Unit of | Penarth Group |
| Sub-units | Cotham Member, Langport Member |
| Underlies | Blue Lias Formation, Scunthorpe Mudstone Redcar Mudstone Formation |
| Overlies | Westbury Formation |
| Thickness | 1–10 m (3.3–32.8 ft) |
| Lithology | |
| Primary | Shale, siltstone, limestone, mudstone |
| Location | |
| Coordinates | 51°12′N 3°18′W / 51.2°N 3.3°W |
| Approximate paleocoordinates | 35°30′N 0°30′E / 35.5°N 0.5°E |
| Region | England |
| Country | United Kingdom |
| Type section | |
| Named for | Lilstock |
The Lilstock Formation is a geologic formation in England. It preserves bivalve, insect and other invertebrate fossils, as well as fossil fish of Agkistracanthus mitgelensis and the basal theropod dinosaur Newtonsaurus cambrensis dating back to the Rhaetian of the Triassic period.