- Rhyacian
The Rhyacian (IPAEng|raɪˈeɪsiən, _el. Ρυαξ ("rhyax"), meaning "stream of
lava ") is the secondgeologic period in thePaleoproterozoic Era and lasted from 2300 Ma to 2050 Ma (million years ago). Instead of being based onstratigraphy , these dates are defined chronometrically.The Bushveld Complex and other similar
intrusion s formed during this period.Huronian glaciation period ended in late Rhyacian 2100 Ma.The first known
Eukaryotes began to evolve in theRhyacian period.References
*
*
Wikimedia Foundation. 2010.
Look at other dictionaries:
Rhyacian — 1. adjective Of a geologic period within the Paleoproterozoic era from about 2300 to 2050 million years ago. 2. noun The Rhyacian period … Wiktionary
Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… … Wikipedia
Neoproterozoic — era 1000 542 million years ago Key events in the Neoproterozoic view • edit … Wikipedia
Mesoproterozoic — era 1600 1000 million years ago Key events in the Mesoproterozoic view • edit … Wikipedia
Cryogenian — Period 850–630 million years ago … Wikipedia
Orosirian — The Orosirian ( /ˌɒrɵˈ … 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
Geology of the North Sea — Contents 1 Tectonic structure 2 Precambrian 3 Finnmarkian, Athollian, Caledonian Orogenies … Wikipedia
Cambrian — For other uses, see Cambrian (disambiguation). Cambrian Period 542–488.3 million years ago … Wikipedia
Carboniferous — For the album by Zu see Carboniferous (album). Carboniferous Period 359.2–299 million years ago … Wikipedia