Precambrian Era
Geological time begins with the Precambrian Era, as it starts with Earth's formation. This era lasted around 88% of Earth's history and happened 800 million years ago, making it the earliest of the geological ages. This era has little to do with life. No organisms are supposed to be detected by even the most careful observations or microscopic studies. This era did make Earth more suitable for life in the distant future.
Geological time begins with the Precambrian Era, as it starts with Earth's formation. This era lasted around 88% of Earth's history and happened 800 million years ago, making it the earliest of the geological ages. This era has little to do with life. No organisms are supposed to be detected by even the most careful observations or microscopic studies. This era did make Earth more suitable for life in the distant future.
Paleozoic Era
This era started 544 million years ago and lasted 300 million years. In this era the continents were still covered in warm, shallow seas. Water which came to Earth from meteorite bombardment in the Precambrian Era. The continents were also formed in this time period. There was an explosion of life in the oceans. These were the first stirrings of life on Earth. They were simple/single celled micro-organisms. Through evolution multi-celled organisms arrive on the scene. After further evolution and and change the first vertebrates, like fish, appear. The plants in the water start colonization and start to abandon the sea and move to land, creating early land plants. Land vertebrates, and amphibious organisms flourished in this era.`
This era started 544 million years ago and lasted 300 million years. In this era the continents were still covered in warm, shallow seas. Water which came to Earth from meteorite bombardment in the Precambrian Era. The continents were also formed in this time period. There was an explosion of life in the oceans. These were the first stirrings of life on Earth. They were simple/single celled micro-organisms. Through evolution multi-celled organisms arrive on the scene. After further evolution and and change the first vertebrates, like fish, appear. The plants in the water start colonization and start to abandon the sea and move to land, creating early land plants. Land vertebrates, and amphibious organisms flourished in this era.`
Mesozoic Era
This era started 245 million years ago, and lasted 180 million years. The sea creatures, which ventured to land in the Paleozoic Era, greatly evolved, and turned into what we know as dinosaurs. The reptiles became the most abundant in this era due to their ability to adapt to drier climates. Dinosaurs were diverse and successful. The first birds and mammals appeared, although very small. During the middle of this era the super continent Pangaea broke apart and formed other smaller continents. Near the end of this era a large meteor collides with Earth, almost destroying life on Earth.
This era started 245 million years ago, and lasted 180 million years. The sea creatures, which ventured to land in the Paleozoic Era, greatly evolved, and turned into what we know as dinosaurs. The reptiles became the most abundant in this era due to their ability to adapt to drier climates. Dinosaurs were diverse and successful. The first birds and mammals appeared, although very small. During the middle of this era the super continent Pangaea broke apart and formed other smaller continents. Near the end of this era a large meteor collides with Earth, almost destroying life on Earth.
Cenozoic Era
This era started 65 million years ago and continues to this day. After the meteor's devastation of Earth, life recovered. In this era famous mountain ranges such as the Rocky Mountains, Alps, and Himalayas, were formed. There was a mammal increase in this era and they evolved and adapted to live in different environments live land, sea, and air. There were more plants in this era than any before. The mammals evolve at a very rapid pace and the first signs of humans can be seen in the grasslands. The Neolithic Revolution, when many human cultures from a lifestyle of hunting and gathering to one of agriculture and settlement, allowing the ability to support an increasingly large population, happened in this era. They evolved further and this led to humankind as we know it.
This era started 65 million years ago and continues to this day. After the meteor's devastation of Earth, life recovered. In this era famous mountain ranges such as the Rocky Mountains, Alps, and Himalayas, were formed. There was a mammal increase in this era and they evolved and adapted to live in different environments live land, sea, and air. There were more plants in this era than any before. The mammals evolve at a very rapid pace and the first signs of humans can be seen in the grasslands. The Neolithic Revolution, when many human cultures from a lifestyle of hunting and gathering to one of agriculture and settlement, allowing the ability to support an increasingly large population, happened in this era. They evolved further and this led to humankind as we know it.