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.
Old Assyrian Empire
The emergence of the Mitanni c. 1500 BC eventually led to a short period of sporadic Mitanni domination c. 1450 BC. The Indo-European-language-family-speaking Mitanni are thought to have conquered and formed the ruling class over the indigenous Hurrians in eastern Anatolia. The Hurrians had spoken a language isolate, one neither of the Afroasiatic language family nor the Indo-European language family.) There are dozens of Mesopotamian cuneiform texts from this period, with precise observations of solar and lunar eclipses, that have been used as "anchors" in the various attempts to define the chronology of Babylonia and Assyria between c. 2000 BC – c. 1300 BC.)