The Pleistocene (often referred to colloquially as the Ice Age) is a geological epoch which lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations.
Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period.
The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology.
The name is a combination of Ancient Greek πλεῖστος, pleīstos, 'most', and καινός, kainós (latinized as cænus), 'new'. - Wikipedia
- The Gelasian (2.6 million to 1.8 million years ago) - man transitions from homonid (ape) to homo sapien (man who walks, uses tools and language)
- The Calabrian (1.8 million to 774,000 years ago) - the genus homo goes through its stages of evolutionary development.
- The Chibanian (774,000 to 129,000 years ago) - marks modern man's various "near relatives" as they come and go.
- And Stage 4 (129,000 to 11,700 years ago) - homo sapiens arise to this present age sans civilization, enculturation, and the impudence of kings, magistrates, etc.
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Prehistory
Prehistory (or pre-history) is the time before people began to write. The word comes from the Ancient Greek words προ (pre = "before") and ιστορία (historia = "history"). Paul Tournal first used the French word Préhistorique. He found things made by humans more than ten thousand years ago in some caves in France. The word was first used in France around 1830 to talk about the time before writing. Daniel Wilson used it in English in 1851.
The term is mostly used for the period from 4.5 billion BC to 3000 BC, roughly speaking, the Neolithic. Sometimes the term "prehistoric" is used for much older periods, but scientists have more accurate terms for those more ancient times.
Less is known about prehistoric people because there are no written records (historical records) for us to study. Finding out about pre-history is done by archaeology. This means studying things like tools, bones, buildings and cave drawings. Pre-history ends at different times in different places when people began to write.
In the more ancient stone age pre-history, people lived in tribes and lived in caves or tents made from animal skin. They had simple tools made from wood and bones, and cutting tools from stone such as flint, which they used to hunt and to make simple things. They made fire and used it for cooking and to stay warm. They made clothing out of animal skins, and later by weaving. Society started when people began doing specialized jobs. This is called the division of labour. The division of labor made people depend on one another and led to more complex civilizations.
Some important sciences that are used to find out more about pre-history are palaeontology, astronomy, biology, geology, anthropology, and archaeology. Archaeologists study things left over from prehistory to try to understand what was happening. Anthropologists study the traces of human behavior to learn what people were doing and why.
After people started to record events, first by drawing symbols (called pictographs) and then by writing, it became much easier to tell what happened, and history started. These records can tell us the names of leaders (such as Kings and Queens), important events like floods and wars, and the things people did in their daily lives. The time when prehistory ended and history started is different in different places, depending on when people began to write and if their records were kept safe or lost so they could be found later on. In places like Mesopotamia, China, and Ancient Egypt, things were recorded from very early times (around 3,200 BC in Ancient Egypt) and these records can be looked at and studied. [Comparatively], in New Guinea, the end of prehistory came much later, around 1900 AD [when coming into contact with modern civilizations].
Timeline of Earth
- 4.5 billion years ago – Earth formed out of smaller rocks flying around the sun
- 3,500 million years ago – first very simple and tiny forms of life in the seas
- 600 million years ago - first animals, also in the seas
- 500 million years ago - first plants and animals on land
- 230 million years ago – first dinosaurs appear
- 65 million years ago – dinosaurs disappear; mammals take their place as dominant animals
- 30 million years ago - first apes
- 2.5 million years ago - first humans
Timeline of people
- 2.5 million years ago – Start of Lower Palaeolithic age, during which a type of early pre-human called Australopithecus lived. These people made tools out of bones and stones and made shelters out of branches.
- 1 million years ago – A type of early human called Homo erectus lived. People made hand axes and wooden spears.
- 250,000 years ago – First Homo sapiens (modern people). People make fire. People use bolas. People hunt elephants.
- 100,000 years ago – Middle Palaeolithic age. Neanderthal people lived. People live in caves and make cave drawings. People begin to bury dead people.
- 40,000 years ago – Upper Palaeolithic age. Cro-Magnon people lived. People make spears from antlers. People make houses from hides (animal skins). People paint cave drawings and make things out of clay. People make needles out of antlers. People make jewellery.
- 10,000 years ago – The last Ice age ends.
- 10,000 BC – 4000 BC – Mesolithic age. In North-west Europe people make bows and arrows. People use dogs to hunt and to carry things.
- 9,000 BC – Neolithic age. People in the Near East start to change from hunting and gathering food to growing crops and using farm animals.
- 7,000 BC – People in South-west Europe begin using copper to make tools.
- 6,000 BC – British Isles move away from Europe. [? the flooding of upper Europe's "Land Bridge" which separates England from Europe? - re slater]
- 2,580 BC – The Egyptians build the Great Pyramids in Giza. People in the Middle East use iron and make plows.
- 2,400 BC – People make Stonehenge in England.
- 3,300 BC – 1,200 BC – Bronze Age (in Britain). People make tools out of bronze.
- 1,200 BC – 400 AD – Iron Age (in Britain). People make tools out of iron. Roman Empire rises and falls.
The Ice Age began in the Pleistocene epoch, approximately 1.8 million years ago. During the Pleistocene, mountain glaciers formed on all the continents and vast glaciers, in places as much as several thousand feet thick, spread across North America and Eurasia. In the eastern U.S., the ice at one time penetrated as far south as central Pennsylvania and northern New Jersey.Though we sometimes think of the " last ice age" as one long, cold period, it wasn't. Ice advanced and retreated as the Earth cycled between glacial (colder) and interglacial (warmer) periods. The ice advances and retreats in North America have been given different names (see chart at left). During the warmer, interglacial periods, debris of all sizes was released by the melting ice and was carried forward by melt-water streams or deposited near the ice margin. In many areas of the U.S., these deposits changed the shape of the continent and created the soil structure that exists today.Archaeological information indicates that hominids evolved rapidly during this time period; our most primitive tools and skeletal remains date back to the Pleistocene. With the end of the Pleistocene, and the retreat of the giant ice sheets, our Bronze and Iron Age cultures developed. The retreat of the ice also had profound effects on the animals that had evolved during the glacial periods. Many of the animals suited to cooler climates became extinct, especially the large megafauna like the wooly mammoth, mastodon and saber-tooth tiger.
What is the difference between Paleolithic, Mesolithic, Neolithic, and Megalithic ages?
The Mesolithic Age (Britannica source: here) is the transition period between the paleo and neolithic ages occurring from 8000 - 2700 BCE. Also called "Middle Stone Age", is an ancient cultural stage that existed between the Paleolithic (Old Stone Age), with its chipped stone tools, and the Neolithic (New Stone Age), with its polished stone tools. Most often used to describe archaeological assemblages from the Eastern Hemisphere, the Mesolithic is broadly analogous to the Archaic culture of the Western Hemisphere. Mesolithic material culture is characterized by greater innovation and diversity than is found in the Paleolithic. Among the new forms of chipped stone tools were microliths, very small stone tools intended for mounting together on a shaft to produce a serrated edge. Polished stone was another innovation that occurred in some Mesolithic assemblages.
Map of the Semitic language families transitioning from Greater Syria across the Near East and into Africa |