Sinemurian
![Jurassic rock strata in the cliffs at East Quantoxhead, near the Sinemurian golden spike.](/Images/godic/202502/11/Cliff_Face_East_Quantoxhead_-_geograph.org.uk_-_10032724438.jpg")
![Ichthyosaurus](/Images/godic/202502/11/Ichthyosaurus_h_harder4438.jpg")
![Abrictosaurus](/Images/godic/202502/11/Abrictosaurus_dinosaur4438.png")
![Scelidosaurus](/Images/godic/202502/11/Scelidosaurus24438.jpg")
In the geologic timescale, the Sinemurian is an age or stage in the Early or Lower Jurassic epoch or series. It spans the time between 199.3 ± 2 Ma and 190.8 ± 1.5 Ma (million years ago). The Sinemurian is preceded by the Hettangian and is followed by the Pliensbachian.