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the Proterozoic

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  • Proterozoic — The Proterozoic (pronEng|ˌproʊtərəˈzoʊɪk) is a geological eon representing a period before the first abundant complex life on Earth. The Proterozoic Eon extended from 2500 Ma to 542.0 ± 1.0 Ma (million years ago), and is the most recent part of… …   Wikipedia

  • Proterozoic — [prät΄ə rə zō′ik, prōt΄ə rō zō′ik] adj. [< Gr proteros, former, compar. of pro, forward (see PRO 1) + ZO + IC] [sometimes p ] designating or of the geologic eon characterized by the development of sedimentary rock, shallow seas, and the first… …   English World dictionary

  • Proterozoic Eon — Younger of the two divisions of Precambrian time, from 2. 5 billion to 543 million years ago. Proterozoic rocks have been identified on all the continents and often constitute important sources of metallic ores, notably of iron, gold, copper,… …   Universalium

  • Proterozoic — 1. adjective Of, or relating to the geologic eon from about 2,500 to 570 million years ago; comprises the Paleoproterozoic, Mesoproterozoic and Neoproterozoic eras; marked by the build up of oxygen in the atmosphere and the emergence of primitive …   Wiktionary

  • Proterozoic — /prot euhr euh zoh ik, proh teuhr /, Geol. adj. 1. noting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, characterized by the appearance of bacteria and marine algae; Algonkian. n. 2. the …   Universalium

  • Proterozoic — Prot•er•o•zo•ic [[t]ˌprɒt ər əˈzoʊ ɪk, ˌproʊ tər [/t]] adj. 1) gel noting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, when bacteria and marine algae were the principal forms of life 2) …   From formal English to slang

  • The Great Story — The Great Story, or Epic of Evolution refer to mythopoetic language used by a social movement (or meta religious movement) that tells the history of the Universe in ways that are simultaneously scientific and sacred. It is an articulation of the… …   Wikipedia

  • Geology of the Death Valley area — The exposed geology of the Death Valley area presents a diverse and complex story that includes at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities, and at least one distinct set of related… …   Wikipedia

  • Proterozoic — adjective Etymology: Greek proteros former, earlier (from pro before) + International Scientific Vocabulary zoic more at for Date: 1899 of, relating to, or being the eon of geologic time or the corresponding segment of rocks that includes the… …   New Collegiate Dictionary

  • The Ozarks — Ozark redirects here. For other uses, see Ozark (disambiguation). Ozark Mountain redirects here. For the wine region, see Ozark Mountain AVA. The Ozarks, Ouachitas, Black Hills, and Sawtooths …   Wikipedia

  • Geology of the Grand Canyon area — The geology of the Grand Canyon area exposes one of the most complete sequences of rock anywhere, representing a period of nearly 2 billion years of the Earth s history in that part of North America. The major sedimentary rock layers exposed in… …   Wikipedia

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