| Front | precambrian |
|---|---|
| Back | پرکامبرین از 4.6 میلیارد سال پیش تا نیم میلیارد سال پیش of, relating to, or denoting the earliest eon, preceding the Cambrian period and the Phanerozoic eon. By the early years of the twentieth century, as the geology of the continents began to be better known, it was realized that Permian and Precambrian glacial deposits occur virtually on all continents and at low latitudes. |
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