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The three-age system is the periodization of human prehistory (with some overlap into the historical periods in a few regions) into three time-periods: the Stone Age, the Bronze Age, and the Iron Age, [1] [2] although the concept may also refer to other tripartite divisions of historic time periods.
These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept). In archaeology and anthropology , prehistory is subdivided into the three-age system , this list includes the use of the three-age system as well as a number of various designation used in reference to sub-ages within the ...
The three-age system has been used in many areas, referring to the prehistorical and historical periods identified by tool manufacture and use, of Stone Age, Bronze Age and Iron Age. [ 1 ] [ 2 ] Since these ages are distinguished by the development of technology, it is natural that the dates to which these refer vary in different parts of the ...
The three-age system is the periodization of human prehistory into three consecutive time periods, named for their predominant tool-making technologies: Stone Age, Bronze Age and Iron Age. [13] In some areas, there is also a transition period between Stone Age and Bronze Age, the Chalcolithic or Copper Age. [14]
The Three Kingdoms of Cao Wei, Shu Han, and Eastern Wu dominated China from AD 220 to 280 following the end of the Han dynasty. [1] This period was preceded by the Eastern Han dynasty and followed by the Western Jin dynasty. Academically, the periodisation begins with the establishment of Cao Wei in 220 and ends with the conquest of Wu by Jin ...
A less severe cold period or ice age is shown during the Jurassic-Cretaceous (150 Ma). There have been five or six major ice ages in the history of Earth over the past 3 billion years. The Late Cenozoic Ice Age began 34 million years ago, its latest phase being the Quaternary glaciation , in progress since 2.58 million years ago.
The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia. [32] [33 ...
See history, history by period, and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang, Geologic time scale, Timeline of evolution, and Logarithmic timeline.