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Definitions of Proterozoic:

noun: from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
adjective: formed in the later of two divisions of the Precambrian era
Example: "Proterozoic life forms"

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Alternative Terms
zoic tectonic recycling continental-crust crust invertebrate dispersal supercontinent saturation cambrian precambrian vigorous markedly-3 convection mantling laurentia archaean continents-evolution-of earth-heat-flow-in earth-interior plate-tectonics precipitation seawater ferrous carbon-dioxide dolomitic-limestone limestone sedimentary-rock glacial-epoch biomarkers ecosystems alga eukaryotae ribonucleic-acid unanswered proterozoic-eon animal-evolution extinction geologic-timescale-table proterozoic-preoterozoic-era preoterozoic-era international-phonetic-alphabet eon earth-disambiguation annum-2 era-geology paleoproterozoic mesoproterozoic neoproterozoic oxygen glacier snowball-earth cryogenian ediacaran stratum epeiric-sea metamorphic-rock continent wilson-cycle orogeny photosynthesis redox sulfur iron-ensiferum-album banded-iron-formation red-beds hematite carbon organic-compound nitrate eukaryote cyanobacteria symbiosis mitochondrion chloroplast plant protist acritarch phanerozoic period-geology trilobite archaeocyatha timetable-of-the-precambrian hadean-time siderian rhyacian orosirian statherian calymmian ectasian stenian tonian algonkian huronian animikean keweenawan tommot-fauna black-canyon-of-the-gunnison-national-park paleogeography schist

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