When did the Cretaceous period begin?
Cretaceous
The Cretaceous (, ) is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (mya) to the beginning of the Paleogene Period mya. It is the last period of the Mesozoic Era, and the longest period of the Phanerozoic Eon. The Cretaceous Period is usually abbreviated K, for its German translation "Kreide" (chalk, "creta" in Latin).
Helladic chronology
Helladic society and culture have antecedents in Neolithic Greece when most settlements were small villages which subsisted by means of agriculture, farming and hunting. The gradual development of skills such as bronze metallurgy, monumental architecture and construction of fortifications brought about the transition from the Neolithic to the Bronze Age. The Late Helladic (c.1550–c.1050) is sometimes called the Mycenaean Age because Mycenae was then the dominant state in Greece. At the end of the Bronze Age (c.1050 BC), Aegean culture went into a long period of decline, termed a Dark Age by some historians, as a result of invasion and war.