Middle Stone Age
The Middle Stone Age (or MSA) was a period of African prehistory between the Early Stone Age and the Later Stone Age. It is generally considered to have begun around 280,000 years ago and ended around 50–25,000 years ago. The beginnings of particular MSA stone tools have their origins as far back as 550–500,000 years ago and as such some researchers consider this to be the beginnings of the MSA. The MSA is often mistakenly understood to be synonymous with the Middle Paleolithic of Europe, especially due to their roughly contemporaneous time span, however, the Middle Paleolithic of Europe represents an entirely different hominin population, "Homo neanderthalensis", than the MSA of Africa, which did not have Neanderthal populations. Additionally, current archaeological research in Africa has yielded much evidence to suggest that modern human behavior and cognition was beginning to develop much earlier in Africa during the MSA than it was in Europe during the Middle Paleolithic. The MSA is associated with both anatomically modern humans ("Homo sapiens") as well as archaic "Homo sapiens", sometimes referred to as "Homo helmei". Early physical evidence comes from the Gademotta Formation in Ethiopia, the Kapthurin Formation in Kenya and Kathu Pan in South Africa.
Archaeology of Northern Europe
The Pre-Roman Iron Age (5th/4th–1st centuries BCE) was the earliest part of the Iron Age in Scandinavia and North European Plain.
Succeeding the Nordic Bronze Age, the Iron Age developed in contact with the 
Hallstatt culture in Central Europe.
Archaeologists first made the decision to divide the Iron Age of Northern Europe into distinct pre-Roman and Roman Iron Ages after Emil Vedel unearthed a number of Iron Age artifacts in 1866 on the island of Bornholm. They did not exhibit the same permeating Roman influence seen in most other artifacts from the early centuries CE, indicating that parts of northern Europe had not yet come into contact with the Romans at the beginning of the Iron Age.