Geologic Time Scales

Geologic Time
Paleozoic Era
Cambrian Period
Ordovician Period
Silurian Period
Devonian Period
Carboniferous Period
Mesozoic Era
Triassic Period
Jurassic Period
Cretaceous Period
Cenozoic Era
Tertiary Period
Quaternary Period
Geologic Timeline

Web Sites

Paleozoic Era. UC Berkeley

Return SAS Home
e-mail Kevin C. Hartzog

Geologic Time Scales

Silurian Period

Dating from 440-410mya, the Silurian Period saw the first comeback in life on Earth. Recovering from the first mass extinction, plants once again colonized land. Plants were soon followed by terrestrial animals, such as spiders and centipeds. The quick colonization of land was greatly helped by a stabilization of Earth's climate. Still, with the earlier glaciers melting, new habitat in the form of freshwater appeared, fish soon moving into this new area. Coral appeared, slowly growing higher as the melting glaciers added to the ocean level. With the newer habitats of deep and open oceans jawed fish soon dominated in oceans, growing larger with more room to move.