Cambrian period (21 sett 545000000 anni a. C. – 21 sett 495000000 anni a. C.)

Descrizione:

Known as the Cambrian Explosion, the Cambrian Period is known for its multitude of diverse life forms. Mostly sponge-like creatures grew in the seas, but now animals started to swim, burrow, defend themselves, and crawl. Some life forms grew hard, sturdy shells which fossilized easily and gave us a clear form. There was very little life on land, and the only vegetation was algae. The weather was generally cold but slowly got warmer through the years.

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