-
Period: 541 BCE to 252 BCE
Paleozoic era
The Paleozoic Era began 541 million years ago and ended about 252 million years ago. In other words, its duration was approximately 290 million years. It ranges from the appearance of animals with shells or exoskeletons, to the emergence of the first amphibians and reptiles. -
Period: 541 BCE to 485 BCE
Cambrian period
-
513 BCE
Most intense burst of evolution ever known
The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. -
Period: 485 BCE to 444 BCE
Ordovician period
-
464 BCE
The first primitive plants began to appear on land
During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second largest mass extinction of all time ended the period. -
Period: 444 BCE to 419 BCE
Silurian period
-
431 BCE
Fossils show evidence of extensive reef building
Continental landmasses were low and sea levels were rising. This meant rich shallow sea ecosystems with new ecological niches. Silurian fossils show evidence of extensive reef building and the first signs that life beginning to colonize the new estuary, fresh water and terrestrial ecosystems. -
Period: 419 BCE to 359 BCE
Devonian period
-
389 BCE
The planet was changing its appearance.
The great supercontinent of Gondwana was headed steadily northward, away from the South Pole, and a second supercontinent began to form that straddled the Equator. -
Period: 359 BCE to 299 BCE
Carboniferous period
-
329 BCE
Dense and swampy forests
Characteristic of the Carboniferous period were its dense and swampy forests, which gave rise to large deposits of peat. Over the eons the peat transformed into rich coal stores in Western Europe and North America. -
Period: 299 BCE to 252 BCE
Permian period
-
275 BCE
Earth's crustal plates formed a single, massive continent called Pangaea.
During the Permian Period, Earth's crustal plates formed a single, massive continent called Pangaea. In the correspondingly large ocean, Panthalassa, marine organisms such as brachiopods, gastropods, cephalopods (nautiloids and ammonoids), and crinoids were present. On land, reptiles replaced amphibians in abundance. -
Period: 252 BCE to 66 BCE
Mesozoic era
The Mesozoic Era is the time of the terrible lizards, the dinosaurs. The Mesozoic began 251 million years ago and ended 66 million years ago. ... During the Mesozoic Era, large groups of animals such as trilobites, graptolites and armored fish disappeared. -
Period: 252 BCE to 201 BCE
Triassic period
-
225 BCE
The supercontinent Pangea began its dislocation
During the Triassic, almost all the lands on Earth were concentrated in a single supercontinent centered roughly on the equator, called Pangea. The supercontinent Pangea began its dislocation during this period, but had not yet separated -
Period: 201 BCE to 145 BCE
Jurassic period
-
173 BCE
Many new dinosaurs emerged
The Jurassic period was characterized by a warm, wet climate that gave rise to lush vegetation and abundant life. Many new dinosaurs emerged in great numbers. Among them were stegosaurs, brachiosaurs, allosaurs, and many others. -
Period: 145 BCE to 66 BCE
Cretaceous period
-
105 BCE
Relatively warm climate
The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas -
Period: 66 BCE to 10
Cenozoic era
The Cenozoic Era began with the extinction of the dinosaurs approximately 66 million years ago. ... It is also known as the "Age of mammals", since this was the privileged way of life throughout its 66 million years of duration. Furthermore, it is the Age in which the human being made his appearance. -
Period: 66 BCE to 2 BCE
Tertiary period
-
34 BCE
The Tertiary was an interval of enormous geologic, climatic, oceanographic, and biological change.
The Tertiary was an interval of enormous geological, climatic, oceanographic and biological changes. It encompassed the transition from a globally warm world containing relatively high sea levels and dominated by reptiles to a world of polar glaciation, sharply differentiated climatic zones, and a predominance of mammals. -
Period: 2 BCE to 10
Quaternary period
-
6
Homo sapiens appeared on Earth.
It was during the Quaternary when Homo sapiens appeared on Earth. In turn, large species, both plant and animal, became extinct, and birds and mammals were the vertebrates that dominated the Earth. In short, there was a great predominance of mammals, a great expansion of the human being, and the presence of a flora and fauna very similar to the current one, which is why the migrations of large mammals or the origin of man have also been seen. he pointed. as possible criteria
