Prehistoric / Archaeological PeriodsThe Stone Age
Archaeologists and historians place the Stone Age as that period
of human development when most of the tools used by human beings were made from
stone. The evidence available to us currently shows that while the this phase of
early human development took place in different parts of the globe, the dates
for the Stone Age was different for different parts of the world. It varies
depending on the dates assigned to stone implements discovered in a region. As a
consequence, dates for the Stone Age have changed with every discovery and the
development of dating methods. There is evidence of stone implements having been
used in Africa as early as 2.5 million years ago, 1.8 million years ago in Asia,
and a million years ago in Europe. Therefore, current theory places the earliest
development of human beings in Africa.
The Stone Age in an area ends with evidence of the earliest known metal implements, and generally ends between 6,000 and 4,000 BCE. The Stone Age is further divided into:
• Palaeolithic Age (Old Stone Age - 2.5 million to 15,000 years ago - a time period that spans 95% of human history): the age in which stone tools were chipped or flaked. (see the page on Anghilak cave, Uzbekistan) • Mesolithic Age (Middle Stone Age, also called the Epipaleolithic Age - 15,000 to 10,000 years ago): the age in which microliths, small, geometric-shaped stone artefacts were attached to wood, antler, or bone to form implements such as arrows, spears, or scythes. • Neolithic Age (New Stone Age - 10,000 to 6,000-4,000 years ago): the age in which ground and polished stone axes became prevalent. Ice Age
During the Stone Age of human
development, the earth also experienced an Ice Age.
.The Ice Ages began 2.4 million years ago and lasted until 11,500 years ago.
During this time, the earth’s climate repeatedly changed between very cold
periods, during which glaciers covered large parts of the world,
and very warm periods during which many of the glaciers melted. The last ice age was 300 years ago.
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Metal Age
The Metal Age starts when human beings began to use metal to make
tools. For archaeologists, the transition from the stone to the metal age occurs
when these metal tools appear alongside stone tools. The type of metal used
initially was probably influenced by the surface availability of the metal in
natural form, and appears to have been either gold or copper, both being softer,
lower melting point metals. A lower melting point was probably critical since
the development of metallurgy closely paralleled the ability to produce hotter
fires as well as the development of containers to hold and cast the melted
metal. The use of gold may even have started with the mechanical shaping of the
metal, first in cold form, then heated and softened, and finally melted and
cast.
Golden Age
Aryan and Saka legends place the use of gold
before the use of copper - possibly a few thousand years earlier. Gold was the
more readily available metal in Central Asia. The legends of Ferdowsi state that
gold was used in ancient times to make surgical knives used to perform Caesarean
operations.
Most of the ancient gold artefacts were plundered, smelted and reused. The unearthing of gold artefacts that predated copper tools, requires finding sites that were hidden or otherwise inaccessible to robbers. We will have to await archaeological evidence to support the legendary evidence that the use of gold preceded the use of copper.
Most of the ancient gold artefacts were plundered, smelted and reused. The unearthing of gold artefacts that predated copper tools, requires finding sites that were hidden or otherwise inaccessible to robbers. We will have to await archaeological evidence to support the legendary evidence that the use of gold preceded the use of copper.
Copper (Chalcolithic, Eneolithic or Æneolithic) Age
The Copper Age in Central Asia and the rest of the Aryan lands is
currently said to begin in the late 5th millennium BCE and lasted for about a
millennium (4,300-3,200 BCE) leading in to the Early Bronze Age. Transition from
the European Copper Age to the Bronze Age occurs about a millennium later -
between the late 4th and the late 3rd millennia BCE.
The use of copper required the development of metallurgy - the science of extracting metal from metal ores - and casting the molten metal in castings.
The use of copper required the development of metallurgy - the science of extracting metal from metal ores - and casting the molten metal in castings.
Bronze Age
Bronze is an alloy of copper and tin that is more hard than either
pure copper or tin. In addition, bronze has a lower melting point than copper or
tin making it easier to form into finished shapes by moulding, casting, or
machining. While a harder metal, bronze still did not break easily under stress
and was corrosion resistant. Bronze was better suited for weapons and tools than
either copper or tin.
The manufacture of bronze required the development of alloy-making technology.
Current reports suggest that the Bronze Age in Central Asia extended from about 3,300 to 1,300 BCE.
The manufacture of bronze required the development of alloy-making technology.
Current reports suggest that the Bronze Age in Central Asia extended from about 3,300 to 1,300 BCE.
Iron Age
With the ability to create higher smelting temperatures came the
ability to extract and work with iron, a metal that was in earlier ages
considered more precious than gold. Simple iron mixed with some residual slag
(the residue when iron is extracted from its ore) is called wrought iron - the
earliest form of iron. Wrought iron is weaker than bronze, but because iron was
more readily available than copper or tin, wrought iron was less complicated to
manufacture than bronze. It was also more easily sharpened than bronze.
Wrought iron was eventually replaced by steel - iron with between 0.02% and 1.7% of carbon. Steel weapons and tools were about the same weight as those of bronze, but stronger.
The Iron Age in Central Asia is estimated to have extended from about 1,300 to 900 BCE.
Wrought iron was eventually replaced by steel - iron with between 0.02% and 1.7% of carbon. Steel weapons and tools were about the same weight as those of bronze, but stronger.
The Iron Age in Central Asia is estimated to have extended from about 1,300 to 900 BCE.
Categories of Time
The broad categories of time are:
Cosmological Period
The Cosmological Period consists of time periods in the origin and
evolution of the universe. According to current scientific theory the
Cosmological Period begins with the Big Bang 13.7 billion years ago and ends
with the formation of the earth 4.5 billion years ago.
Geological Period
The Geological period consists of time periods in the origin and
evolution of earth. The earth is about 4.5 billion years old. The time from the
origin of the earth to the present is divided into super eons, eons, eras and
periods.
The Precambrian period is a super eon that is sub-divided into three eons:
• the Hadean Eon (4.5 to 3.8 billion years before present),
• the Archean Eon (3.8 to 2.5 billion years before present),, and
• the Proterozoic Eon (2.5 billion to 570 million years before present)
The Precambrian period is a super eon that is sub-divided into three eons:
• the Hadean Eon (4.5 to 3.8 billion years before present),
• the Archean Eon (3.8 to 2.5 billion years before present),, and
• the Proterozoic Eon (2.5 billion to 570 million years before present)
millions of years The Precambrian Period |
millions of years The latest or Phanerozoic Eon (570 million years before present to the present) |
millions of years Subdivisions of the Cenozoic Era (65 million years before present to the present) |
Prehistoric (Archaeological) & Historic Periods
The Prehistoric Period consists of time periods in the origin and
evolution of humankind from about 2.5 million years to about 900 BCE. the
Prehistoric Period is divided into the Archaeological Periods of the Stone,
Bronze and Iron Ages.
The Historic Period records the activities of humankind from about 900 BCE or from that time when records are available or can re reconstructed. The Historic Period overlaps with the Prehistoric Periods such as the Iron Age when it is possible to reconstruct timelines of a people's history
The Historic Period records the activities of humankind from about 900 BCE or from that time when records are available or can re reconstructed. The Historic Period overlaps with the Prehistoric Periods such as the Iron Age when it is possible to reconstruct timelines of a people's history
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