Geologic Time Scale:
The Geologic Time Scale is a record of life and geologic events in Earth’s history. Geologic Time Scale was created by scientists who studied rock layers, and index fossils (an index fossil is a fossil that represents other organisms that existed for a short period of time.) By using this information scientists placed Earth’s rocks in order using relative age. Radioactive dating (radioactive dating provides ages of organisms or particles) is also crucial to determine the absolute age. The Geologic Time Scale separates time, so continue reading to figure out how scientists end eras.
How do Scientists decide when an era ends?:
Since there are four eras you might wonder, “How do scientists figure out when a time period should end?” Well, a time period ends when life forms start, end, or when a BIG change happens.
Interesting Facts:
Other interesting facts include: Earth started 4.6 BYA, and the Precambrian Time is the first and longest era. Not much happens in the Precambrian Time many more things happen during the Mesozoic Era and the Cenozoic Era. All periods include smaller periods in them like, the Cenozoic Era has three periods within it, one of the smaller periods in it is the Quaternary period. Speaking of the Quaternary period, you are currently living in the Quaternary period, in the Cenozoic Era.
The Geologic Time Scale is a record of life and geologic events in Earth’s history. Geologic Time Scale was created by scientists who studied rock layers, and index fossils (an index fossil is a fossil that represents other organisms that existed for a short period of time.) By using this information scientists placed Earth’s rocks in order using relative age. Radioactive dating (radioactive dating provides ages of organisms or particles) is also crucial to determine the absolute age. The Geologic Time Scale separates time, so continue reading to figure out how scientists end eras.
How do Scientists decide when an era ends?:
Since there are four eras you might wonder, “How do scientists figure out when a time period should end?” Well, a time period ends when life forms start, end, or when a BIG change happens.
Interesting Facts:
Other interesting facts include: Earth started 4.6 BYA, and the Precambrian Time is the first and longest era. Not much happens in the Precambrian Time many more things happen during the Mesozoic Era and the Cenozoic Era. All periods include smaller periods in them like, the Cenozoic Era has three periods within it, one of the smaller periods in it is the Quaternary period. Speaking of the Quaternary period, you are currently living in the Quaternary period, in the Cenozoic Era.