Hadean
The Hadean () is a geologic eon of the Earth pre-dating the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the ICS, 4 billion years ago. , the ICS describes its status as ""informal"". Geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks on Earth. W. Brian Harland later coined an almost synonymous term, the "Priscoan period", from "priscus", the Latin word for "ancient". Other, older texts simply refer to the eon as the Pre-Archean.
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.