The Pliensbachian is an age of the geologic timescale and stage in the stratigraphic column. It is part of the Early or Lower Jurassic Epoch or Series and spans the time between 192.9 ±0.3 Ma and 184.2 ±0.3 Ma. From Wikipedia
The peer-reviewed description uses a rare Pliensbachian fossil to place the ichthyosaur faunal turnover earlier than previously inferred.
