'Ancient life'. A geological era from 600 to 245 million years ago, including periods such as the Devonian and Carboniferous.
An era of geological time, dating from about 550 to 250 million years ago (comprising the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods).
Era of geologic time 225-570 million years ago.
an era of geological time, from 570 to 245 million years ago.
the first era of geological time which began about 600 million years ago with the cambrian period and lasting about 375 million yeras until the end of the permian period; from Greek palaios 'old, ancient' + zoe 'life' + modern adjectival suffix -ic which denotes relationship.
An era of geological time between 544 and 248 million years ago. Palaeozoic means 'ancient life'. See Geological Timescale.
An era of geological time from 590-250Ma;
Era comprising the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian, spanning 545-245Ma. The Paleozoic started with an apparent evolutionary burst (the Cambrian Explosion) and ended with the largest mass extinction seen on this planet, the P-T event.