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The precambrian time was when the earth formed, It was said to have occured 4.6 million years ago. Scientists said continetal shields appeared most of fossils if not all are rare in this time.
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Shelled marine invertebrates appear. Including Trilobites and brachiopods.
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Echinoderms appear. Echinoderms appear aswell as brachiopods. This period was 488 million years ago.
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Eurypterids, land plants and animals appear. Occured 440 million years ago. Lasted 30 million years Silurian was firsrt used in 1830's this was said to discribe a sequence of rocks in South Wales.
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Ages of the fish began, amphibians appeared giant horse tails and ferns also began in this time era.
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Amphibians flourish; Brachipods are common in oceans; Forest and swamps covered most of the land. About 360 million years ago. It also had a timespan of 35 million years.
Link: http://www.watersheds.org/earth/gtime02e.htm -
This period in time was said to have been 318 million years ago, it lasted 39 million years. Giant dragonflys and cockroaches appeared.
Link: http://www.watersheds.org/earth/gtime02f.htm -
The land mass Pangea came to a whole. This period occured about 300 million years ago. A mass extinction marks the end of the Paleozoic Era.
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The Triassic time period lasted from 245 to 208 million years ago. It lasted 37 million years ago, dinosuars started to appear aswell as ammonites were vastly common, aswell as other mammals.
Link: http://www.watersheds.org/earth/gtime03a.htm -
Dinosuars are the dominate life form at the time in history, primative birds and flying reptiles appear.The Jurassic time period lasted from 208 to 146 million years ago, and it lasted about 62 million years.
Link: http://www.watersheds.org/earth/gtime03c.htm -
The Cretaceous time period lasted from 146 to 65 million years ago, floweing plants and modern birds started to appear. A mass extintion marks the end of the Mesozoic era. This time era lasted 81 million years.
Link: http://www.watersheds.org/earth/gtime03c.htm -
Age of mammals begin.The marine world of the Paleocene was much more like the modern marine realm than that of the Cretaceous. This era occured about 65.5 million years ago.
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Horses, flying squirrels, bats and whales appear. This time period was about 55.8 million years ago,
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This period or era occured 23 million years ago. Grazing herds are abundant ratcoons and wolfs appear. This era lasted 17 million years. It is the fourth epoch of the Cenozoic Era. Sedimentary rocks are exposed.
Link: http://science.howstuffworks.com/environmental/earth/geology/miocene-epoch-info.htm -
This period or era happened 5.3 million years ago. The epoch was marked by a number of significant tectonic events that created the landscape we know today.
Link: http://www.ucmp.berkeley.edu/tertiary/pliocene.php -
Last glacial period ends. 0.0115 million years ago. Many areas would have remained barren for a long time except for an interesting phenomenum. Bare rock surfaces close to retreating glaciers heated up in the sunlight, causing thermal uplift of warmed air, which was replaced by dense cold air sweeping outward from the base of the glacier.
Link: http://www.jamestown-ri.info/holocene.htm -
This period was 33.9 million years ago. Deer, pig, camels, cats, and dogs started to appear. The climate changed the land and the plants and food aswell.
Link: http://www.encyclopedia.com/topic/Oligocene_epoch.aspx -
This era happened 1.8 million years ago. The Pleistocene is the best-known glacial period (Ice Age) of the earth's history. During the various glacial stages many areas not covered with ice, including the arid and semiarid parts of the W United States, had periods of increased rainfall and lessened evaporation.
Link: http://www.answers.com/topic/pleistocene-epoch
