a unit of geological time during which a system of rocks formed

of or relating to or denoting the second period of the Mesozoic era

of or relating to or denoting the time before the Jurassic period

from 230 million to 63 million years ago

The Late Jurassic is the third epoch of the Jurassic period, and it spans the geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago.

The Early Jurassic epoch (in chronostratigraphy corresponding to the Lower Jurassic series) is the earliest of three epochs of the Jurassic period.

The Middle Jurassic is the second epoch of the Jurassic Period; it lasted from 176 to 161 million years ago.

from 230 million to 63 million years ago

The Late Jurassic is the third epoch of the Jurassic period, and it spans the geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago.

The Early Jurassic epoch (in chronostratigraphy corresponding to the Lower Jurassic series) is the earliest of three epochs of the Jurassic period.

The Middle Jurassic is the second epoch of the Jurassic Period; it lasted from 176 to 161 million years ago.