Huronian series

См. также в других словарях:

• Huronian System — ▪ geology       major division of Precambrian rocks in North America (the Precambrian began about 3.8 billion years ago and ended 540 million years ago). The Huronian System is well known in the Great Lakes region and has been divided into three… …   Universalium

• Bruce Series — ▪ geology       division of Precambrian rocks in North America that is well developed northeast of the Lake Huron region (the Precambrian began about 3.8 billion years ago and ended 540 million years ago). The Bruce Series is the lowermost of the …   Universalium

• Animikie Series — ▪ geology       division of Precambrian rocks and time in North America (the Precambrian occurred from 3.96 billion to 540 million years ago). The Animikie Series, the uppermost division of the Huronian System, overlies rocks of the Cobalt Series …   Universalium

• 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

• Monetons — West Virginia s Moneton tribe on the Kanawha Valley [Kahnawáˀkye in Tuscarora (Iroquois) means waterway , kye is augmentive suffix. Kaniatarowanenneh means big waterway in Mohawk (Iroquois). Lachler, McElwain, and Burke… …   Wikipedia

• Marinoan glaciation — Neoproterozoic Snowball Periods 1000  – …   Wikipedia

• 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

• Keweenawan System — ▪ geochronology       division of late Precambrian rocks and time in North America (the Precambrian began about 3.8 billion years ago and ended 540 million years ago). Rocks of the Keweenawan System are about 10,700 metres (about 35,000 feet)… …   Universalium

• Ice age — An ice age is a period of long term reduction in the temperature of the Earth s surface and atmosphere, resulting in an expansion of continental ice sheets, polar ice sheets and alpine glaciers. Glaciologically, ice age is often used to mean a… …   Wikipedia

• Gaia hypothesis — The study of planetary habitability is partly based upon extrapolation from knowledge of the Earth s conditions, as the Earth is the only planet currently known to harbour life. The Gaia hypothesis, also known as Gaia theory or Gaia principle,… …   Wikipedia

• Cryogenian — Period 850–630 million years ago …   Wikipedia