The Proterozoic Eon

[Audio] The Proterozoic Week 4 Discussion Wende Wagner Eon.

[Audio] Proterozoic Eon Earth's History Began 2.5 Billion years ago Ended 542.0 Million years ago Longest geologic eon Modern Plate Tectonics became active.

[Audio] Proterozoic Eon Subdivided Paleoproterozoic Mesoproterozoic Neoproterozoic.

[Audio] Paleoproterozoic Era Early life of Earth Stable Continents first appeared and began to accrete lasting approximately a billion years First abundant fossils of living organisms were found. Cyanobacterial evolved, using the biochemical process of photosynthesis to produce energy and oxygen.

[Audio] Mesoproterozoic Era First, there is evidence of oxygen building up in the atmosphere Global catastrophe for many bacterial groups Allowed for explosion of eukaryotic forms, which included multicellular algae.

[Audio] Neoproterozoic Era Super continent Rodinia Drifting continents formed continent Pannotia Series of glaciations took place lead to snowball earth Increase of carbon dioxide in the atmosphere Decline of stromatolites Small organic microfossils Red and blue algae, ciliates, dinoflagellates, testate, and amoeba Multicellular life forms such as cnidarians.

[Audio] Modern Plate Tectonics North America nearly rifted through what is now its midsection about 1.1 billion years ago Rocks that formed at this time are best seen around Lake Superior Mountain ranges grew where landmasses collided Vast amounts of ice formed, which led to ice ages.

[Audio] Oxygen creation Essential atmosphere component Produced early life as a waste product Triggered ice ages and iron deposits Adaptation of some lifeforms, which led to complex multicellular life such as algae.

[Audio] Proterozoic Parks Where rocks exemplify a specific event or preserve fossils or rocks from a certain geologic age. Appalachian National Scenic Trail Boston Harbor Islands National Recreation Area Death Valley National Park, Glacier National Park Grand Canyon National Park Mojave National Preserve Pipestone National Monument Tonto National Monument and Yukon-Charley Rivers National Preserve..

About the Earth of Proterozoic Eon. Earth History Utube video by Jim Rayner.

[Audio] Questions. [image] A cartoon question mark with a face Description automatically generated.

References. The Proterozoic Eon (berkeley.edu) Proterozoic Eon—2.5 Billion to 541 MYA (U.S. National Park Service) (nps.gov) Neoproterozoic Era | Science Facts (scifacts.net) Paleoproterozoic Era | Geology Page History of Earth - Proterozoic Eon (PaleoProterozoic Era) (corzakinteractive.com) https://www.scifacts.net/timelines/mesoproterozoic/ Era Neoproterozoica - Jorge Quilcate plate tectonics during proterozoic eon images - Search Images (bing.com) The Proterozoic Period, cradle of early life | Osho News Mojave National Preserve - Adam Elliott Photography.