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Gas and dust in space, known as planetary nebula, condense into one mass, now known as our planet Earth. This occured 4600 million years ago.
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The origin of life has come upon the Earth. The first cells are dated back to 3900 million years ago.
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Our oldest dated rocks can be traced to 3800 million years ago.
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3600 million years ago, our first stromatolites lived. These are fossils of blue and green algae that are considered to be prokaryotes.
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The first fossil evidence of a cell containing a nucleous can be traced back 2100 million years.
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Throughout the Paleozoic, which began 544 million years ago, numerous basic organisms devlop on our planet. Beginning with our first fish and land plants, 505-407 million years ago.
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Beetles, scorpians, and centipedes were roaming the planet 385 million years ago. http://3quarksdaily.blogs.com/3quarksdaily/images/leafinsect_vmed_1p.jpg
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Approximately 375 million years ago, our first land animals appeared. Soon after, the first sharks and seeded planets developed.
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The first reptiles appeared on Earth 330 million years ago.
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A major event occured that killed about 95% of the planet's population. This occured 245 million years ago to begin the Mesozoic time, where reptiles will prosper.
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The first dinosaurs were living 228 million years ago, just after the first crocodiles graced the planet.
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Just after the beginning of dinosaurs, the first mammals began their survival on Earth. The mammals were small, shrew like organisms. Soon after, the dinosaurs began to prosper and develop to the extent that there were many different types, herbivores, carnivores, and omnivores.
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About 115 million years ago, the first flowering plants could be seen on our planet.
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The Mesozoic ends just like the Paleozoic, with a major impact event killing much of the organisms that inhabited the Earth. This time period will be known as the age of mammals.
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About 64 million years ago, the first ancesstors of dogs and cats can be found on earth.
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Grasses become widespread 60 million years ago.
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The first ancestors of pigs and deer can be traced back 57 million years. Soon after, the ancestors of horses and rabbits developed on our planet.
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About 39 millions years ago, the first monkeys existed on our earth.
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About four million years ago, organisms that resembled humans roamed the earth.
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The first direct human ancestor was on earth only one million years ago.
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Homo sapiens began to exist on our planet .1 million years ago, which is the same as 100,000 years ago.
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According to this geologic time scale, the Revolutionary War would have happened only one minute before present time, yet it occured 234 years ago.
