Cambrian (Cambrian period) 542-488 million years ago. In this era, there are fossils of animals begins not with a spine. With a solid cover many types of trunk bark, such as the Sai Lo byte, nautiloid, corals, sea shells, widespread. In this era, most of the animals eat plants like algae, they are food. With the discovery of fossil Sai Lo Koh Tarutao byte. Since 2007, the oldest fossils found in the country, Thailand.
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