Paleozoic Era
Approximate duration
Periods of the era
Devonian Period
Silurian Period
Carboniferous Period
Permian Period
Ordovician Period
Cambrian Period
Manifestations of life
jawless fishes (hagfish).
shelled organisms Examples: Trilobites.
plants with a vascular system
scorpions and millipedes
fishes like sharks and bony fishes.
lobe-finned fishes Example: coelacanth
giant cockroaches and dragonflies
Reptiles
synapsids (ancestors of mammals)
diapsids (gave rise to the dinosaurs)
Most important geological events
Cambrian explosion
550 -250 million years ago
The formation of Gondwanaland, Laurasia and Pangaea
Global temperatures