The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 161.5 ± 1.0 to 143.1 ± 0.8 million years ago, which is preserved in Upper Jurassic strata. From Wikipedia
Researchers identified new anatomical traits in the exceptionally preserved Dacentrurus armatus skull, prompting the formal definition of Neostegosauria.
