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Contents 1 Human time periods 1.1 Prehistorical periods 1.2 Historical periods 1.3 Calendar systems 1.4 Mythological and astrological time periods 2 Cosmological time periods 2.1 13.7 billion years ago: The Big Bang 2.2 Formation of Population III stars 2.3 Formation of Population II stars 2.4 5 Billion Years ago - Formation of Population I stars 3 Geologic time periods 4 See also 5 References

The categorization of time into discrete named blocks is called periodization. This is a list of such named time periods as defined in various fields of study. Major categorization systems include cosmological (concerning the various time periods in the origin and evolution of our universe), geological (concerning time periods in the origin and evolution of earth ) and historical (concerning time periods in the origin, evolution of mankind).

[edit] Human time periods

The extinction of the paleozotic was the biggest extinction of all of earth's history Based on current and contested evidence[1], the human species has found its origins starting from about 265,000 years ago - when homo began to develop. It is broadly divided into prehistorical (before history began to be recorded) and historical periods (when written records began to be kept).

[edit] Prehistorical periods

In archaeology and anthropology, human prehistory is subdivided around 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 traditional three.

• The Stone Age
  • Paleolithic Age
    • Lower Paleolithic
    • Middle paleolithic
    • Upper Paleolithic
  • Mesolithic Age
  • Neolithic Age
• The Copper Age. Note: The Copper Age was not part of the original three-age system.
• The Bronze Age
• The Iron Age

The dates for each age can vary by region. On the geologic time scale, the Holocene epoch starts at the end of the most recent Ice age (about 9400 BC) and continues to the present. The beginning of Mesolithic is usually considered to correspond to the beginning of the Holocene epoch.

[edit] Historical periods

• Ancient history
  • Mesopotamia (3500 BC - 559 BC)
  • Indus Valley Civilization (3300 BC - 1300 BC)
  • Old Kingdom (Egypt, 3000 BC - 2000 BC)
  • Middle Kingdom (Egypt, 2000 BC - 1300 BC)
  • Shang Dynasty (China 1800 BC - 1200 BC)
  • Vedic Period (India 1500 BC - 500 BC)
  • New Kingdom (Egypt, 1550 BC - 1070 BC)
  • Zhou Dynasty (China 1200 BC - 500 BC)
  • Ancient Greece (Greece and Near East, c. 1000 BC- 31 BC, see Timeline of Ancient Greece)
  • Jomon period (Japan 800 BC-400 BC)
  • Ancient Rome (509 BC - 476)
  • Yayoi Period (Japan 400 BC - 300)
  • Kofun Period (Japan 300- 600)
  • Migration Period (Europe 200 - 700)
• Middle Ages (Europe, 4th century - 15th century)
  • Early Middle Ages European (500–1000 CE)
    • Dark Age (Europe, 4th century - 900)
    • Viking Age (Scandinavia, Europe, 793–1066)
  • Asuka period, Nara period, Heian period, Kamakura period, Muromachi period, and Azuchi-Momoyama period (Japan, 538 - 1603)
  • Southern and Northern Dynasties, Sui Dynasty, Tang Dynasty, Period of Five Dynasties and Ten Kingdoms (China, 420 - 960), Liao Dynasty, Song Dynasty, Jin Dynasty (1115–1234), Western Xia Dynasty, Yuan Dynasty, and Ming Dynasty (China, 220 - 1644)
  • Classic and Postclassic eras, Central America (200 - 1519)
  • Gupta Empire, Pala Empire, Rashtrakuta, Hoysala Empire, and Kakatiya Empire (India, 280 – 1323)
  • Islamic Golden Age (Islam, 700 - 1300)
  • High Middle Ages (Feudalism) European military expansion (1000–1450 CE)
  • Srivijaya (Indonesia, 3rd century to 14th century), Tarumanagara (358-723), Sailendra (8th & 9th centuries), Kingdom of Sunda (669-1579), Kingdom of Mataram (752–1045), Kediri (1045–1221), Singhasari (1222–1292), Majapahit (1293–1500)
  • Chenla (Cambodia, 630 – 802) and Khmer Empire (Cambodia, 802 – 1432)
  • Anterior Lý Dynasty and Triệu Việt Vương, Third Chinese domination, Khúc Family, Dương Đình Nghệ, Kiều Công Tiễn, Ngô Dynasty, The 12 Lords Rebellion, Đinh Dynasty, Prior Lê Dynasty, Lý Dynasty, Trần Dynasty, Hồ Dynasty, Fourth Chinese domination (Vietnam, 544 - 1427)
  • Early Intermediate, Middle Horizon, Late Intermediate, Late Horizon (Peru, 200 - 1534)
    • Huari, Chimú, Chincha, Chanka Confederation, Tiwanaku, Inca
  • Late Middle Ages European (1300–1500 CE)
    • The Renaissance (Europe, 14th century - 16th century)
• Early modern period (Europe, 16th century - 18th century)
  • Age of Discovery (or Exploration) (Europe, 15th century - 17th century)
  • Elizabethan period (United Kingdom, 1558 - 1603)
  • The Protestant Reformation (Europe, 16th century)
  • Jacobean Era (United Kingdom, 1603-1625)
  • The Age of Enlightenment (or Reason) (Europe,18th century)
  • Tokugawa shogunate (Japan, 1603 - 1868)
  • Mughal Empire (India, 1526 - 1857)
  • Ottoman Empire (Islam, 1299 – 1923)
  • Qing dynasty (China, 1644 - 1912)
  • Spanish hegemony (Americas, 16th century - 1820s; Europe, 16th and 17th century, Philippines, 1525 - 1898)
• Modern era (Europe, 18th century - 20th century)
  • Industrial Revolution (Europe, United States, elsewhere 18th and 19th centuries)
  • (along with early modern era) Age of European colonialism and imperialism
  • Napoleonic Era (1799 - 1815)
  • Georgian Era (United Kingdom, 1714 - 1830)
  • Victorian era (United Kingdom, 1837 - 1901); British hegemony, much of world, around the same time period.
  • Romantic Era (1850 - 1920)
  • Edwardian period (United Kingdom, 1901 - 1910)
  • Meiji period (Japan, 1868 - 1912)
  • Machine Age(1900 - 1945)
  • World War I (Much of Earth, 1914 - 1918)
  • Interwar period (Earth, 1918 - 1939 or 1937)
  • World War II (Earth, 1937 or 1939 - 1945)
  • Atomic Age (after 1945)
  • Cold War (Soviet Union and United States, as well their respective allied states, 1945 - 1989 or 1991)
  • Space Age (after 1957)
• Post-Modern (Soviet Union and United States, 1973 - Present)
  • Information Age (1990 - Present)
    • Net Generation & Generation Z Era (present)

Vietnam War

Though precise years and dates are often debated in academic circles.

[edit] Calendar systems

Various societies in the past have created calendars to record events, such as religious observances and agricultural tasks. A common characteristic of most known calendars is that they measure time in relation to a particular point in history, known as the epoch date. A period between epoch dates is known as a calendar era.

[edit] Mythological and astrological time periods

• Astrological ages
  • Age of Taurus
  • Age of Aries
  • Age of Pisces
  • Age of Aquarius

• Greek mythology
  • Golden Age, self-sufficient
  • Silver Age, self-indulgent
  • Bronze Age, warlike
  • Heroic Age, nobly aspirant
  • Iron Age, violent

• Aztec mythology
  • Nahui-Ocelotl, Destroyed by Jaguars
  • Nahui-Ehécatl, Destroyed by Hurricane
  • Nahuiquiahuitl, Destroyed by rain of Fire
  • Nahui-Atl, Destroyed by Flood
  • Nahui-Ollin, Destroyed by Earthquakes

[edit] Cosmological time periods

[edit] 13.7 billion years ago: The Big Bang

Because of the scales involved (both very large and very small), cosmological time periods are usually described in seconds. In this table, each row is defined in seconds after the Big Bang, with earliest at the top of the chart.

Start	End	Period
0 s	1×10−43 s	Planck epoch
1×10−43 s	1×10−36 s	Grand unification epoch
1×10−36 s	1×10−32 s	Inflationary epoch
1×10−32 s	1×10−12 s	Electroweak epoch
1×10−12 s	1×10−6 s	Quark epoch
1×10−6 s	1 s	Hadron epoch
1 s	3 min	Lepton epoch
3 min	380,000 a	Photon epoch

[edit] Formation of Population III stars

The first stars were formed from the Hydrogen and Helium formed in the Big Bang were short lived massive Population III stars. Nuclear processes in these stars converted the Hydrogen and Helium into metals and other heavier elements. As the Population III stars died these heavier elements were released.

[edit] Formation of Population II stars

Population II stars contain metals formed in the Population III stars. These were longer lived than the Population III stars and some of them are still around. In addition to the metals these inherited from the Population III stars the Population II stars also formed metals by nuclear reactions and when the stars died much of that material was returned to be used as the building blocks for the next generation of stars.

[edit] 5 Billion Years ago - Formation of Population I stars

Population I stars are also known as metal rich stars. Our own sun is a Population I star and was formed about 5 billion years ago.

[edit] Geologic time periods

The geologic time scale covers the extent of the existence of Earth, from about 4600 million years ago to the present day. It is marked by Global Boundary Stratotype Sections and Points. Geologic time units are (in order of descending specificity) eons, eras, periods, epochs, and ages; and the corresponding chronostratigraphic units, which measure "rock-time", are eonothems, erathems, systems, series, and stages.

The second and third timelines are each subsections of their preceding timeline as indicated by asterisks. The Cenozoic is sometimes divided into the Quaternary and Tertiary periods, although their use is no longer official.

Millions of Years

[edit] See also

• Exponential timeline shows all history on one page in ten lines.
• Periodization for a discussion of the tendency to try to fit history into non-overlapping periods.
• List of fossil sites with link directory
• List of timelines

[edit] References

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