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Wikipedia definition
1. MesoproterozoicThe Mesoproterozoic Era is a geologic era that occurred between 1600 Ma and 1000 Ma (million years ago). The Mesoproterozoic was the first period of Earth's history with a respectable geological record. Continents existed in the Paleoproterozoic, but we know little about them. The continental masses of the Mesoproterozoic are more or less the same ones that are with us today.
Read “Mesoproterozoic” on English Wikipedia
Read “中原生代” on Japanese Wikipedia
Read “Mesoproterozoic” on DBpedia

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