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The Paleozoic Era was formed about 544 million years ago with the expand of 300 million years.Paleo- was a root for "ancient or early."
Imagine this:
Put Earth's 4.6 billion year history starts at midnight. 7 hours later one celled organisms appear. After 14 hours simple bodied organisms appear. After 21 hours later, larger organisms appear.Dinosaurs arrive before 11 but become extinct at 11:30. Humans arrive a second before midnight
Many people call this the era of the Dinosaurs! It began about 245 million years ago and lasted about 180 millions years ago. The meaning of Meso- middle
Eras
Eras are three long units between Precambrian Time and the present time.
This Era began about 66 million years ago.Around this area mammals were added to the species list.The word Cenozoic combines two different definitions, ceno- defines "recent" and -zoic means "life".
The geologic time scale is a record of the life forms and geologic events in Earth's history.
One of the units of geologic time into which geologists divide eras to compare species.
Reason to use a Geologic Time Scale
To help progress results of ancient and present time species, scientists use a simple chart called the geologic time scale.