With reference to temporal sequence: Pertaining to a second period or condition of things… Geology. In early use, applied (with some notion of sense…

Of, relating to, or designating the second era of the Phanerozoic eon, between about 245 million and 65 million years ago, which followed the…

Geology. = Mesozoic, adj. Obsolete. rare.

Originally: designating a division of geological time analogous to the Mesozoic era but applied specifically in connection with fossil plants…