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It was science that named and decided on the era's in the first place, so they determine them by matching what another scientist has said is one era or another. Usually era's are defined by some cataclism.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoMost indicate significant, long-term changes in overall climate, with consequent long-term changes in the wildlife shown in the fossil record.
The boundaries are not always clear-cut and are revised from time to time as further evidence emerges.
Wiki User
∙ 13y agoThey divide them based on changes in life forms. :)
Wiki User
∙ 12y agorocks and fossils
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What happened at the end of the mesozoic era but not at the end of the Paleozoic era?
There were major asteroid impacts.
How does the end of the Cenozoic era compare to the climate near the end of the Mesozoic era?
it is cooler {apex}
What causes an era to end?
The end of an era, or the beginning of an era, is any time marked by a distinctive character. The Roman era. The use of steam power marked the beginning of an era. The Middle Ages is also referred to as the Medieval era. The Neolithic era, 3000 to 1800 bc
When did the Cenozoic era end?
The Cenozoic era started 65 million years ago.
The second era in geological time?
Warm, shallow seas covered most of Earth's surface near the end of the Paleozoic Era.
What era was also the end of The end of the Permian?
The permian period was the end of the paleozoic era.
The end of the Permian period was also the end of what Era?
The permian period was the end of the paleozoic era.
When was End of an Era created?
End of an Era was created on 2006-06-01.
What happened at the end of the mesozoic era but not at the end of the Paleozoic era?
There were major asteroid impacts.
What era in music did beethoven end?
The Classical era
What happen at the end of the mesozoic era but did not happen at the end of paleozoic era?
There were major asteroid impacts.
Which President oversaw the end of the Reconstruction Era?
Rutherford Hayes oversaw the end of the Reconstruction Era.
What happened at the end of the mesozoic era but did not happen at the end of paleozoic era?
There were major asteroid impacts.
How does the end of the Cenozoic era compare to the climate near the end of the Mesozoic era?
it is cooler {apex}
What happened at the end of the Mesozoic era but did not happen at the end of the Paleozoic era?
There were major asteroid impacts.
How you can determine the end-point of the permanganometry?
We can determine the end point of permanganometry by using titration.
When did the Victorian era end?
The Victorian era ended in 1901 this was also said as the end of the nineteenth century
