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100,000 years ago, the first humans appeared
Homo sapiens were the first humans -
3 mya - present, the Quaternary Period is occurring.
This is the period we are in, and the early period had saber-tooth tigers and wooly mammoths roaming the earth -
2.6 mya - present, the Quaternary Glacation occurred/ is occurring.
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22 mya, the first grasses appeared
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The Neogene Period occurred 23 mya - 3 mya
This period had early ancestor animals of cattle, sheep, goat, gazelles and antelope. -
33 mya, the first apes appeared
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35 mya, the first giant sloth appeared
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50 mya, the Eohippus (First Known Horse) appeared
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65 mya, the great dinosaur extinction occurred
It is thought a giant asteroid hit the earth, causing a mass extinction -
The Paleogene Period occurred 66 mya - 23 mya
This period was after the great dinosaur extinction, and many mammals and other animals began to evolve -
140 mya - 130 mya, the first flowering plants appeared
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The Cretaceous Period occurred 146 mya - 66 mya
This era was defined as what we imagine today
Dinosaurs like the T-Rex roamed the Earth -
The Jurassic Period occurred 200 mya - 146 mya
Dinosaurs dominated the Earth's land and ocean at this time -
200 mya, the first earthworms appeared
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220 mya - 200 mya, the first mammals appeared
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240 mya, the age of the dinosaurs began
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The Permian-Triassic Extinction occurred 250 mya
This was the largest mass extinction, wiping out many vertebrates -
The Triassic Period occurred 251 mya - 200 mya
This period was defined as when life on land began to diversify after the great extinction -
The Permian Era occurred 299 mya - 251 mya
This era was recognized for the mass extinction that affected many organisms
The geography had large bodies of land and water, as Pangaea was fused together -
336 mya - 173 mya, the supercontinent Pangaea formed
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359 mya - 299 mya, the Carboniferous Period occurred
This period was defined by its swampy, humid geography
Plants and animals evolved to adapt to this climate -
360 mya - 260 mya, the Karoo Glacation occurred.
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The Devonian Extinction occurred 365 mya
Many tropical marine organisms went extinct during this time -
395 mya - 370 mya, the first Amphibians appeared
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400 mya - 360 mya, the first ferns appeared
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400 mya - 330 mya, the first winged insects appeared
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412 mya - 380 mya, the first insects appeared
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The Devonian Era occurred 416 mya - 359 mya
This era was defined as when plants and animals started to move towards the land -
425 mya - 390 mya, the first sharks appeared
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Nearing the end of the Ordovian Era, the great marine extinction occurred. Sea levels decreased due to colder temperatures. This caused a lot of marine life to die.
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The Silurian Period occurred 444 mya - 416 mya
This period is defined by the great marine extinction and colder temperatures -
460 mya - 430 mya, the Andean Saharan Glacation occurred.
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470 mya - 440 mya, the first land plants appeared
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472 mya - 451 mya, the supercontinent Laurasia formed
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The Ordovician Era occurred 488 mya - 444 mya
This era is defined as when marine life diversified, but many went extinct nearing the end and the formation of the supercontient Laurasia -
488 mya - 443 mya, the Ordovian Era had diverse lifeforms. These organisms included graptolites, trilobites, brachiopods, conodonts, red and green algae, primitive fish, cephalopods, corals, crinoids, and gastropods
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530 mya - 440 mya, the first jawed fish appeared
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541 mya - 516 mya, the Cambrian explosion occurred
This general period was when complex organisms with skeletal structures appeared -
The Cambrian Period occurred 542 mya - 488 mya
This era is defined when organisms began to rapidly evolve, also known as the Cambrian Explosion -
During the Cambrian Era, Earth gradually got warmer. The seas were warmer allowing more organisms to evolve. Even so, the land were generally barren since few plants evolved to live on land
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550 mya, the first jellyfish appeared
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596 mya - 578 mya, the supercontinent Godwana formed
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600 mya, the first multicellular organisms began to appear
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663 mya - 573 mya, the supercontinent Pannotia formed
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850 mya - 635 mya, the Cryogenian Ice Age occurred.
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The Neoproterozoic Era occurred 1000 mya - 542 mya
This era is defined as when the first multicelluar organisms appeared and the supercontinent Pannotia and Gondwana -
1100 mya - 700 mya, the supercontinent Rodina formed
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1200 mya, the first green plants, similar to algae, appeared
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1200 mya, the first sexually reproducing organisms appeared
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The Mesoproterozoic Era occurred 1600 mya - 1000 mya
This era is defined as when the supercontinent Rodina was formed -
1800 mya, the first Eukaryotes began to appear
These single celled micro-organisms had a nucleus -
1900 mya - 1100 mya, the supercontinent Atlantica formed
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2100 mya - 1900 mya, the supercontinent Arctica formed
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2200 mya, Earth faced a crisis
The rapidly expanding cyanobacteria caused a huge increase in oxygen
This would cause oxygen levels to rise and oxygen poisoning. -
2400 mya - 2100 mya, the Huronian Glacarion occurred
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2500 mya - 1600 mya, the Paleoproterozoic Era occurred
This era is defined as when the first eukaryotes were formed and the formation of Arctica and Atlantica -
2700 mya, the first cyanobacteria began to form. These micro-organisms used photosynthesis to form oxygen.
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2700 mya, Kenorland, the second supercontinent, began to form
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2800 mya - 2400 mya, the supercontinent Ur formed
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The Neoarchean Era occurred 2800 mya - 2500 mya
This era is defined is defined where oxygen began to rise and the second supercontient, Kenorland. -
2900 mya ago, the first Ice Age occured.
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Around the time the Mesoarchean Period occured, 3200 mya, stromatolites began to appear. These organisms formed the first coral reefs.
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The Mesoarchean Era occurred about 3200 mya - 2800 mya
This era is defined as when Vaalbara broke up, the formation of Ur, and the first ice age. -
Around the time the Mesoarchean Period occured, 3200 mya, stromatolites began to appear. These organisms formed the first coral reefs.
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3500 mya, the first life began on Earth. Single celled micro organisms called prokaryotes began to appear. These organisms did not have a nucleus or membrane during this time.
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The Paleoarchean Era occurred 3600 mya - 3200 mya.
This era is defined as the beginning of life and the shifting of crusts due to plate tectonics. -
3600 mya, Earth's crusts began to collide, forming the first supercontinent. Vaalbara finished its formation about 3100 mya.
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The Eoarchean Era occurred 4000 mya - 3600 mya
It is defined as when Earth begins to gain a solid crust. -
4000 mya - 3800 mya, Earth gradually cooled down. As this occured, the lava would cool down to a firm crust.
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4500 mya ago, the planet Thea hit Earth. This would later form the moon. The planet Thea was similar size to Mars, and the debris caused by this impact would form the moon.
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The Hadean Era occurred 4600 mya - 4000 mya
It is defined as the era when Earth started first formed.
There are not many specific events, but the Earth was just like a giant ball of lava. There was no oceans, no atmosphere, and no life. -
4600 mya, Earth was formed from a supernova.
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About 4000 mya, as the vapours from the hot Earth are released, and Earth gradually gained an atmosphere. It consisted of molecules like CO2, N2, H20, CH4, etc.
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10000 mya, the Milky Way Galaxy collided and gobbled up another galaxy. Evidence of this are 50,000 known stars moving backward.
