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.
Dacian bracelets
Dacian civilization went through several stages of development, from the Thracian stage in the Bronze Age to the Geto-Dacian stage in the classical period that lasted from the 1st century BC to the 1st century AD. The Thracian stage is associated with the emergence of Thracian populations from the fusion of the local Chalcolithic stock with the incoming peoples of the transitional Indo-Europeanization Period. By the time of Bronze Age, and during the transitional period to the Iron Age, the cultures of this Carpathian area may be attributed to proto-Thracian and even Thracian populations—ancestors of the peoples known to Herodotus as the Agathyrsae and the Getae, and to the Romans as the Dacians (by Iron Age II). The culture of these nuclear groups were typified by military aristocracies.