Proterozoic - Wikipedia The Proterozoic (IPA: ˌ p r oʊ t ər ə ˈ z oʊ ɪ k, ˌ p r ɒ t-,-ər oʊ-,-t r ə-,-t r oʊ- PROH-tər-ə-ZOH-ik, PROT-, -ər-oh-, -trə-, -troh-) [3] [4] [5] is the third of the four geologic eons of Earth's history, spanning the time interval from 2500 to 538 8 Mya, [6] and is the longest eon of Earth's geologic time scale
Proterozoic Eon | Oxygen Crisis, Animals, Facts | Britannica 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
Proterozoic Eon—2. 5 Billion to 541 MYA - U. S. National Park Service The Proterozoic Eon is the most recent division of the Precambrian It is also the longest geologic eon, beginning 2 5 billion years ago and ending 541 million years ago It accounts for a little less than 4 9ths of geologic time
The Proterozoic Eon - University of California Museum of Paleontology The period of Earth's history that began 2 5 billion years ago and ended 542 0 million years ago is known as the Proterozoic, which is subdivided into three eras: the Paleoproterozoic (2 5 to 1 6 billion years ago), Mesoproterozoic (1 6 to 1 billion years ago), and Neoproterozoic (1 billion to 542 0 million years ago) *
8. 5: Proterozoic Eon - Geosciences LibreTexts 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
What is Proterozoic? - Earth. com It is the most recent eon within the Precambrian period, which includes the Hadean, the Archean, and the Proterozoic eons The Proterozoic is itself also divided into three sub-geologic eras (from oldest to youngest): the Paleoproterozoic; Mesoproterozoic; Neoproterozoic; The Proterozoic Eon is known for hosting the transition to an oxygenated
Proterozoic - New World Encyclopedia During the Proterozoic eon, eukaryotes (cells with a distinct nucleus) first appear in the fossil record about 1 7 billion years ago Over the next billion years the eukaryotes greatly diversified until by the later Proterozoic there were abundant soft-bodied, multicellular organisms —although, being soft-bodied, they were only rarely
Proterozoic Eon - Geology Page The Proterozoic is a geological eon representing the time just before the proliferation of complex life on Earth The name Proterozoic comes from Greek and means “earlier life” The Proterozoic Eon extended from 2,500 Ma to 542 0±1 0 Ma (million years ago), and is the most recent part of the informally named “Precambrian” time