Paleoproterozoic


Paleoproterozoic

The Paleoproterozoic (pronEng|ˌpeɪlɪoʊˌproʊtərəˈzoʊɪk, also spelled Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoic occurring between Ma|2500 |1600 . This is when the continents first stabilized. This is also when Cyanobacteria evolved, a type of bacteria which uses the biochemical process of photosynthesis to produce energy and oxygen.

Before the significant increase in atmospheric oxygen almost all life that existed was , that is, the metabolism of life depended on a form of cellular respiration that 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 Grypania fossils and the first Eukaryotes appeared during this time.

During this era the earliest surviving mountain belt appears, in the Wopmay Fault Zone of Canada (West of Hudson Bay, 2100-1800 million years ago).

External links

* [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


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.