Answer:
6.01 Geological Time Scale
Reflection
How long (in centimeters and years) was the Precambrian period compared to the rest of the scale?
The Precambrian period was the longest period on the timeline. It lasted approximately from 4.6 billion years ago to 543 million years ago. It was characterized by the formation of space
How many years and “centimeters” of time separated the dinosaurs and humans on Earth?
Dinosaurs existed during the Mesozoic Era, while humans existed during the Cenozoic Era. They were approximately 65 million years apart.
How many years and centimeters of time passed before life appeared on Earth?
Humans appeared around 6 million years ago, however aquatic life was the first to exist. This was during the Paleozoic Era around 3.7 billion years ago!
For how many years of geologic time have humans existed?
Around 200,00 years.
Did dinosaurs exist at the same time as mammals? Explain your answer using the geologic time scale.
No, dinosaurs died out before mammals. We know this since the first sign of mammals was the Cenozoic Era, but dinosaurs existed in the Mesozoic Era which was several million years later.
By: Nikayla Bodon
Mesozoic Era
Triassic Period: 210-251 mya
Jurrassic Period: 145-210 mya
Cretaceous Period: 65-145 mya
The Precambrian Era
During the Mesozoic Era, big creatures such as dinosaurs roamed the Earth. You may have heard the name Jurrassic from the movie Jurrassic park, however this was a reality back then with creatures such as Velociraptor, Apatosaurus, Stegosaurus, and Triceratops roaming the Earth.
Cenozoic Era
Teritary Period: 65-2.5 mya
Quantenary Period: 2.5 mya- now
This period of time is the era me and you live in today. It was the start of human life and the development of many living organisms you see today and don't!
Hadean Eon: 4.6-3.8 bya
Archean Eon: 3.8-2.5 bya
Proterozoic Eon: 2500- 543 mya
This is the eras major events include the formation of galaxies, planets, asteroids, comets, and stars, and is the earliest time period. It began around 4.6 billion years ago and is very contreversial. It consisted of the Hadean, Archean, and Proterzoic Eons.
Paleozoic Era
Cambrian Period: 500-550 mya
Ordovician Period: 438-500 mya
Silurian Period: 410-438 mya
Devonian Period: 360-410 mya
Cargoniferous Period: 290-360 mya
Permian Period: 251-290 mya
The Paleozoic Era was characterized by the formation of Pangea and known as the "Age of Fish". There several types of aquatic life