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05.01: Geologic Time Scale
Transcript of 05.01: Geologic Time Scale
The Phanerozoic eon stretches from nearly 540 million years ago to today. The Phanerozoic eon is the eon tat every thing began to take form.
The Cenozoic Era was about 4 1/2cm (66 million years) ago. Mammals were appearing and the world started to form as it is today.
The Paleozoic Era was around 20cm (542 million years) ago. This time period was the longest ago and so not a lot is known of it. But this was the point when things started to happen and more life was being created. Before this there was a sort of stand still in time because hardly even minor changes was happening.
The Mesozoic Era was around 10 1/2cm( 252.2 million years) ago. This time was known for it's dinosaurs. But not only was there dinosaurs, small mammals would appear later around the Cretaceous period.
The Quaternary period is the closest period, probably since it stretches from around the Ice age to recent times. Around the beginning is the time that Man started to populate and the world became as it is today.
The Tertiary is the time when the climate started to cool and the giant reptiles started to disappear. This was also the time when the first signs of man started to show.
The Triassic period started when the world was just one continent. This was when the first dinosaurs were forming. Before this there was almost anly marine life.
During the Jurassic time period the big dinosaurs were appearing and soon even birds were appearing. By now the one big continent had split into two.
During the Cretaceous period dinosaurs still ruled the land, but now birds and mammals were popping up and populating the earth. the marine world was also over running.
Most of the Cambrian period was only microscopic marine plants
small marine animal life. And what land there was there was all most nothing on it.
At first in the Ordovician period, there was not a lot of difference in it then in the Cambrian period. But as time went by vertebrates began to apear and so fish inter the ancent world.
And finally in the Silurian period life on land began to form. Now there were small plants on land and fish with bones in the sea.
In the Devonian period, larger plants started to cover the earth creating forests. and soon the first of the animals that began to walk on land appeared.
The Carboniferous was when the dominate land animals were amphibians. forest now covered the land and the land began to form into one contenent.
And now, in the Permian period mammal like animals were appearing and the earth began to separate into deserts, forest and even a bit of tundra. but sadly this period ended with most of the population started to die out leaving a blank space for the Triassic period.
1.What scale did you use to make your model?
The scale was 1/23
2.How did you decide to use this scale? Show your calculations.
I used 1/23 because 460cm/23 = 20. this seemed like it would do all right for the Phanerozoic Eon.
3.Based on the scale you used, how long (in centimeters) was the Precambrian period compared to the rest of the scale?
I guessed that the Precambrian period would be around 16 cm, if the Phanerozoic is 20cm.
4.How many “centimeters” of time separated the dinosaurs and humans on Earth?
According to my scale, around 4 to 3 cm would seperate them.
5.Were you surprised by the length of the time scale when you saw it on a continuous strip of paper?
Why or why not? Explain your answer as it relates to the scope of Earth’s geologic past.
No, probably since I didn't do it on paper, but even on the model I made it seems lke a short time when it actully took millions and millions of years.