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Proterozoic Eon, the younger of the two divisions of Precambrian time, extending from 2.5 billion to 541 million years ago. During the Proterozoic, the atmosphere and oceans changed significantly. Its rocks contain the fossil remains of bacteria and blue-green algae as well as the first oxygen-dependent animals.
Rocks formed during the Proterozoic Eon have fossil evidence of simple organisms, such as bacteria, algae, and wormlike animals. In the Phanerozoic Eon, the rocks formed have fossils of animals and plants such as dinosaurs, mammals, and trees. Scientists who study fossils are called palaeontologists.
24 sie 2024 · The Proterozoic Eon, meaning “earlier life,” comes after the Archean Eon and ranges from 2.5 billion to 541 million years old. During this time, most of the central parts of the continents had formed, and plate tectonic processes had started.
6 wrz 2016 · Phanerozoic Eon. Geologic Time Scale Worksheet. Use the tables below to label the Periods of each Era on the timeline. Label these above the timeline and be sure to include: Vertical line. Name of period See ‘Quaternary Period’ example below. Name: ______________________________ Paleozoic Era. Mesozoic Era. Today. Cenozoic Era.
The Proterozoic Eon, meaning “earlier life,” is the eon of time after the Archean eon and ranges from 2.5 billion years old to 541 million years old. During this time, most of the central parts of the continents had formed and the plate tectonic process had started.
21 sie 2024 · The Proterozoic Eon, meaning “earlier life,” is the eon of time after the Archean eon and ranges from 2.5 billion years old to 541 million years old. During this time, most of the central parts of the continents had formed and the plate tectonic process had started.
Figure 1. Eras of the Precambrian Eon. Single-celled and simple multicelled organisms first developed during the Precambrian eon. There are many fos-sils from this time because the sea-dwelling creatures were trapped in sediments and preserved. The Phanerozoic eon is subdivided into three eras – the Paleozoic era, Mesozoic era, and Cenozoic era.
