"paleozoic era" | Definition and Related Words

Noun

is an instance of: era, geological era - a major division of geological time; an era is usually divided into two or more periods
has:
- permian, permian period - from 280 million to 230 million years ago; reptiles
- carboniferous, carboniferous period - from 345 million to 280 million years ago
- age of fishes, devonian, devonian period - from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
- silurian, silurian period - from 425 million to 405 million years ago; first air-breathing animals
- ordovician, ordovician period - from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
- cambrian, cambrian period - from 544 million to about 500 million years ago; marine invertebrates
same as: paleozoic