Hettangian
Period
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The Hettangian is the earliest age and lowest stage of the Jurassic Period of the geologic timescale. It spans the time between 201.3 ± 0.2 Ma and 199.3 ± 0.3 Ma. The Hettangian follows the Rhaetian and is followed by the Sinemurian. Wikipedia
Epoch: Early Jurassic
Fossils: NHMUK PV R 41212
Occurred: 201.3 (+/- 0.2) million years ago - 199.3 (+/- 0.3) million years ago
Upper boundary GSSP: East Quantoxhead, West Somerset, England, UK; 51°11′27″N 3°14′11″W / 51.1909°N 3.2364°W
Upper GSSP ratified: 2000