- Kaapvaal craton
of granitic melt. Chavagnac et al. , 1999 . There is no indication that the Neoarchean to early Paleoproterozoic ... 2004 http gsa.confex.com gsa 2004AM finalprogram abstract 78610.htm Timing and Provenance of Neoarchean ... more details
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- Cryogenian
Geological period image The Cryogenian from Greek language Greek cryos cold and genesis birth is a geologic period that lasted from Mya 850 635 . It forms the second geology geologic geologic period period of the Neoproterozoic era geology Era , preceded by the Tonian Period and followed by the Ediacaran . The Sturtian and Marinoan glaciation s, ref These events were formerly considered together as the Varanger glaciations, from their first detection in Norway s Varanger Peninsula . ref which are the greatest ice ages known to have occurred on Earth and may have covered the entire planet, occurred during this period. These so called Snowball Earth snowball earth events are the subject of much scientific controversy . The main debate involves whether these glaciations were truly global or merely localised events. Ratification The period has not received the international ratification mention from whom that most geological time periods undergo the most recent being the Ediacaran Period, which was ratified in 2004 . The start of the period is defined only on the ages of the rocks and not on any observable and documented global event. This is problematic as estimates of rock ages are variable and are subject to laboratory error. For instance, the Cambrian Period is marked not by rock younger than a given age period start Cambrian million years , but by the appearance of the worldwide Treptichnus pedum diagnostic trace fossil assemblage. This means that rocks can be recognised as Cambrian when examined in the field and do not require extensive testing to be performed in a lab to find a date. As yet, there is no consensus on what global event is a suitable candidate to mark the start of the Cryogenian Period, and its base is only loosely set to expr switch lc Cryogenian hadean 4567.17 archean eoarchean 3800 paleoarchean palaeoarchean 3600 mesoarchean 3200 neoarchean 2800 proterozoic paleoproterozoic palaeoproterozoic siderian 2500 rhyacian 2300 orosirian 2050 statherian 1 ... more details
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- Kenora District
Lake Caldera , which is one of the world s best preserved Neoarchean caldera complexes and is some ... more details
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- Vaalbara
cite journal title Paleomagnetism of selected neoarchean paleoproterozioc cover sequences on the Kaapvaal ... more details
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- Waterberg Biosphere
Infobox mountain range name Waterberg br Thaba Meetse image Lapalalariverdown.jpg image caption River gorge in the Lapalala Wilderness of the Waterberg showing horizontal sandstone layering highest Geelhoutkop ref http www.waterbergbiosphere.org Sites 1016 Geelhoutkop.html Geelhoutkop Waterberg Biosphere Reserve ref highest elevation 1830 highest ref listing List of mountain ranges of South Africa parent nearest city Vaalwater map South Africa region ZA map caption label position location Limpopo lat d 24 lat m 4 lat s 30 lat NS S long d 28 long m 8 long s 30 long EW E coordinates ref geology Bushveld igneous complex , sandstone period Neoarchean to early Paleoproterozoic orogeny Kaapvaal craton length 170 length orientation NE SW width 80 width orientation NW SE easiest route From the towns of Vaalwater or Bela Bela The Waterberg lang nso Thaba Meetse is a mountainous massif of approximately 14,500 square kilometers in north Limpopo Province , South Africa . The average height of the mountain range is 600 m with a few peaks rising up to 1400 m above sea level. Vaalwater town is located just north of the mountain range. The extensive rock formation was shaped by hundreds of millions of years of riverine erosion to yield diverse bluff and butte landform ref name Hogan C.Michael Hogan, Mark L. Cooke and Helen Murray, The Waterberg Biosphere , Lumina Technologies, May 22, 2006. http www.luminatechnologies.org lumaw.html ref . The ecosystem can be characterised as a dry deciduous forest or Bushveld . Within the Waterberg there are archaeological finds dating to the Stone Age , and nearby are early evolutionary finds related to the origin of human s. Waterberg is the first region in the northern part of South Africa to be named as a Biosphere Reserve by UNESCO . Geology The underlying rock formation derives from the Kaapvaal craton , formed as a precursor island roughly 2.7 billion years ago. This crustal formation became the base of the Waterberg, which was further tran ... more details
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- Temagami greenstone belt
typical of Neoarchean 2,800 2,500 million year old banded iron formations Layered chert ... more details
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- Caldera
rich ore deposit s. One of the world s best preserved mineralized calderas is the Neoarchean Sturgeon ... more details
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- Timeline of natural history
2,800 Ma Neoarchean Era starts. Breakup of the Vaalbara supercontinent 2,736 Ma Formation of the Temagami ... more details
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- Algoman orogeny
mya 2690 million years ago . ref cite journal title Neoarchean trans subprovince sediment transport ... more details
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- Great Lakes tectonic zone
geon 18 and 17 reactivation of the Neoarchean Great Lakes Tectonic Zone, northern Michigan ... more details
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