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Precambrian
(Encyclopedia) Precambrian, name of a major division of geologic time (see Geologic Timescale, tablegeologic timescale, table), from c.5 billion to 570 million years ago. It is now usually divided…Keewatin
(Encyclopedia) Keewatin: see Precambrian.Proterozoic eon
(Encyclopedia) Proterozoic eon: see Precambrian.Archean eon
(Encyclopedia) Archean eon: see Precambrian.Coutchiching
(Encyclopedia) CoutchichingCoutchichingk&oomacr;ˌchĭchĭngˈ [key]: see Precambrian.Arbuckle Mountains
(Encyclopedia) Arbuckle MountainsArbuckle Mountainsärˈbŭkəl [key], range of low, rolling hills, rising c.700 ft (210 m) above the prairie, S Okla.; remnant of mountains formed in the Precambrian.…stromatolite
(Encyclopedia) stromatolite, layered structures produced by the binding together of sediments by a thin layer of cyanobacteria. The layers, which are deposited very slowly, gradually produce rounded…Siberian Platform
(Encyclopedia) Siberian Platform or Angara Shield, large, geologically stable area of Precambrian rocks, N Asia, comprising much of Siberia, Russia. It is bounded, in general, on the west by the…Baltic Shield
(Encyclopedia) Baltic Shield, the continental core of Europe, composed of Precambrian crystalline rock, the oldest of Europe. The tectonically stable region was not affected by the Caledonian,…Table of Geological Periods
It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud, but there is no way of estimating the length of this process. Our Earth acquired its present size…Trending
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