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3 days ago · A geochronologic unit is a subdivision of geologic time. It is a numeric representation of an intangible property (time). Eon, era, period, epoch, subepoch, age, and subage are the hierarchical geochronologic units. Geochronometry is the field of geochronology that numerically quantifies geologic time.
Paleozoic Era: 542 Million to 250 Million Years Ago. Jose A. Bernat Bacete/Getty Images. The Paleozoic Era began with the Cambrian Explosion, a relatively rapid period of speciation that kicked off a long period of life flourishing on Earth. Vast amounts of life forms from the oceans moved onto the land.
3 days ago · Stone Age, prehistoric cultural stage, or level of human development, characterized by the creation and use of stone tools, the oldest known of which date to some 3.3 million years ago. The Stone Age is usually divided into three separate periods: Paleolithic, Mesolithic, and Neolithic.
- What was the Stone Age?The Stone Age was the prehistoric cultural stage, or level of human development, that was characterized by the creation and use of stone tools. It...
- What are the three periods of the Stone Age?The Stone Age is divided into three separate periods, namely the Paleolithic (Old Stone Age), Mesolithic (Middle Stone Age), and Neolithic (New Sto...
- When did the Stone Age start?The beginning of the Stone Age coincides with the discovery of the oldest known stone tools, which have been dated to some 3.3 million years ago.
- What type of tools were made during the Stone Age?Humans created four types of tools during the Stone Age: pebble tools; bifacial tools, or hand-axes; flake tools; and blade tools.
4 days ago · A groundbreaking study published in the Proceedings of the National Academy of Sciences has revealed that Paleolithic people settled in Cyprus thousands of years earlier than previously believed. This discovery significantly alters our understanding of early human migration patterns across continents and islands, highlighting the Mediterranean ...
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4 days ago · Cambrian Period, earliest time division of the Paleozoic Era, extending from 538.8 million to 485.4 million years ago.
4 days ago · The Old Stone Age, or Palaeolithic as it is more formally known, is an archaeological period apart. Lasting more than four million years at a global scale and at least 900,000 years in Britain, the Palaeolithic spanned time that is orders of magnitude greater than for any other archaeological period. The time encompasses the evolution of our ...
5 days ago · The Iranian Central Plateau (ICP) with the Alborz and the Zagros Mountains is located at the crossroads between the Levant and the Caucasus to the west and Central Asia and East Asia to the east. These two regions yielded key paleoanthropological and archaeological sites from the Middle Pleistocene period. These discoveries highlight a large human biological and cultural diversity in this area ...
