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.
Hispania
In the Mesolithic period, beginning in the 10th millennium BC, the Allerød Oscillation occurred. This was an interstadial deglaciation that lessened the harsh conditions of the Ice Age. The populations sheltered in Iberian Peninsula (descendants of the Cro-Magnon) migrated and recolonized all of Western Europe. In this period one finds the Azilian culture in Southern France and Northern Iberia (to the mouth of the Douro river), as well as the Muge Culture in the Tagus valley.