The Paleoproterozoic (pronEng|ˌpeɪlɪoʊˌproʊtərəˈzoʊ
ɪk, also spelled Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoicoccurring between Ma|2500 |1600 . This is when the continents first stabilized. This is also when Cyanobacteriaevolved, a type of bacteriawhich uses the biochemicalprocess of photosynthesisto produce energy and oxygen.
Before the significant increase in atmospheric oxygen almost all life that existed was , that is, the
metabolismof life depended on a form of cellular respirationthat did not require oxygen. Free oxygen in large amounts is poisonous to most anaerobic bacteria, and at this time most life on Earth vanished. The only life that remained was either resistant to the oxidizing and poisonous effects of oxygen, or spent its life-cycle in an oxygen-free environment. This main event is called the Oxygen Catastrophe. Also the first Grypaniafossils and the first Eukaryotesappeared during this time.
During this era the earliest surviving mountain belt appears, in the
Wopmay Fault Zoneof Canada(West of Hudson Bay, 2100-1800 million years ago).
* [http://www.stratigraphy.org/geowhen/stages/Paleoproterozoic.html GeoWhen Database]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Paleoproterozoic — 1. adjective Of a geologic era within the Proterozoic eon; comprises the Siderian, Rhyacian, Orosirian and Statherian periods from about 2500 to 1600 million years ago, when cyanobacteria increased the amount of oxygen in the … Wiktionary
Trans-Hudson orogeny — [ North American craton, also called Laurentia.] [ Wyoming, Superior and Hearne cratons] The Trans Hudson orogeny, Trans Hudsonian orogeny, Trans Hudson orogen (THO), or Trans Hudson Orogen Transect (THOT), (also referred to as the Trans… … Wikipedia
Snowball Earth — The Snowball Earth hypothesis as it was originally proposedcite book author = Kirschvink, J.L. year = 1992 chapter = Late Proterozoic low latitude global glaciation: The snowball Earth title = The Proterozoic Biosphere: A Multidisciplinary Study… … Wikipedia
Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… … Wikipedia
Rae craton — Ungava PeninsulaThe Ungava Peninsula, situated on the northeast portion of the Canadian Shield, is where the Rae Province connects with the Superior Province. The area is composed of Archean rocks (ca. 2.7 2.9 Ga) from the Douglas Harbour Domain… … Wikipedia
Wyoming craton — [ North American craton, also called Laurentia.] The Wyoming craton is located in the west central United States more specifically, in Montana, Wyoming, and parts of northern Utah. Also called the Wyoming province, it is the initial core of the… … Wikipedia
Mesoproterozoic — era 1600 1000 million years ago Key events in the Mesoproterozoic view • edit … Wikipedia
Huronian glaciation — The Huronian glaciation (or Makganyene glaciation) extended from 2400 Mya to 2100 Mya, during the Siderian and Rhyacian periods of the Paleoproterozoic era, triggered by the oxygen catastrophe, which oxidised the atmospheric methane (a greenhouse … Wikipedia
Kaapvaal craton — The Kaapvaal craton (Limpopo province of South Africa), along with the Pilbara craton of Western Australia, are the only remaining areas of pristine 3.6 2.5 Ga crust on Earth. Similarities of rock records from both these cratons, especially of… … Wikipedia
Precambrian — For the album by German band The Ocean, see Precambrian (album). Precambrian Period 4567.17–542 million years ago … Wikipedia