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 | | 2.1 Archean (4.6 — 2.5 Ga) Earth’s Prehistory The Earth age is about 4.6 Ga (Giga annum — billion years ago). |
 | | During 900 — 500 Ma (Mega annum — million years ago) the Pan African orogeny was formed and finished by the creation of Pan-African continent. |
 | | In the period marine limestones and dolomites were probably formed from which marbles were created in today’s northern Greece (THASSOS, VOLAKAS, AJAX), Bulgaria (MURA) and Macedonia (SIVEC) after several phases of metamorphism in the Paleozoic, the Mesozoic and the Tertiary (Zagorchev, 2001, Moores, Fairbridge, 1997). |
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