Cryptic (geology)
The Cryptic era is an informal term for the earliest geologic evolution of the Earth and Moon. It is the oldest (informal) era of the Hadean eon, and it is commonly accepted to have begun close to 4533 million (about 4.533 billion) years ago when the Earth and Moon formed. No samples exist to date the transition between the Cryptic era and the following Basin Groups era for the Moon (see also Pre-Nectarian), though sometimes it is stated that this era ended 4150 million years ago for one or both of these bodies. Neither this time period, nor any other Hadean subdivision, has been officially recognized by the International Commission on Stratigraphy.
Mycenae
In the absence of documents and objects that can be precisely dated, events at Mycenae can only be dated relatively within the constraints of Helladic chronology which relies on categorisation of stratified material objects, mainly pottery, within an agreed historical framework. Mycenae developed into a major power during LHI (c. 1550–c. 1450 BC) and is believed to have become the main centre of Aegean civilisation through the fifteenth century to the extent that the two hundred years from c. 1400 BC to c. 1200 BC (encompassing LHIIIA and LHIIIB) are known as the Mycenaean Age. The Minoan hegemony was ended c. 1450 and there is evidence that Knossos was occupied by Mycenaeans until it too was destroyed c. 1370 BC. From then on, Mycenaean expansion throughout the Aegean was unhindered until the massive disruption of society in the first half of the eleventh century (LHIIIC) which ended Mycenaean civilisation and culminated in the destruction of Mycenae itself c. 1150 BC.