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Kimmeridgian

Geologic period
In the geologic timescale, the Kimmeridgian is an age in the Late Jurassic Epoch and a stage in the Upper Jurassic Series. It spans the time between 154.8 ±0.8 Ma and 149.2 ±0.7 Ma. The Kimmeridgian follows the Oxfordian and precedes the... Wikipedia
Occurred: 157.3 (+/- 1) million years ago - 152.1 (+/- 0.9) million years ago
Age: 157.3 and 152.1 million years old
Lower boundary definition: FAD of the Ammonite Pictonia baylei
Lower boundary GSSP: Flodigarry, Skye, Scotland, UK; 57°39′40″N 6°14′44″W / 57.6610°N 6.2455°W