Phanerozoic Eon:
 

Phanerozoic Eon: The period of time known as an eon, between the end of the Precambrian and today, The Phanerozoic begins with the start of the Cambrian period, 544 million years ago. Phanerozoic (meaning "visible life") and is divided into three eras: Paleozoic, Mesozoic and Cenozoic. It is the period of abundant, complex life on Earth.

 

Cenozoic Era The Cenozoic Era - is the most recent from the present with three major subdivisions, two of them are grouped into the new and old Tertiary Periods. (Eocene [AKA Neogene] and Miocene [AKA Paleogene]), Anyway it is from the present to about 65 million years ago. and Tertiary Periods. The Cenozoic An era of geologic time from the beginning of the Tertiary period (65 million years ago) to the present. Its name is from Greek and means "new life." the Quaternary Period The Quaternary Period is from now to 1.8 million years ago Quaternary It is named after the Latin word "quatern" (four at a time). It contains two epochs (or periods depending on who you believe): the Holocene is the most current. and than there is the Pleistocene. Since it is believed that humans first appeared during the Holocene Epoch, the Quanternary Period is commonly referred to as the "Age of Man." When the first modern people like us appeared and the first cities were built. The Holocene Period The Holocene Period is named after the Greek words "holos" (entire) and "ceno" (new). It goes from the present to about 8,000 years ago, basically within the recorded history of mankind. The Pleistocene Period The Pleistocene Period Is named after the Greek words "pleistos" (most) and "ceno" (new), and is from about 8,000 years ago to about 1.8 million years ago. the Tertiary Periods The Tertiary Periods are called the Eocene Period and the Miocene Period and it is the time of "new life." the Eocene Period (Eocene is also called Neogene) The Eocene Period (From the Greek: "eos" [dawn] and "ceno" [new] ) is from 33.7 to 55.5 million years ago and has two epochs in it. the Pliocene and The Miocene. the Pliocene Epoch The Pliocene epoch is about between 1.8 and 5.3 million years ago. From the Greek: "pleion" (more) and "ceno" (new). The Miocene Epoch (Miocene is also called Paleogene) The Miocene Period the time between 5.3 and 23.8 million years ago. Miocene is from the Greek words "meion" (less) and "ceno" (new). The Miocene Epoch with warming global temperatures and enormous spread of grasslands and savannas.

 

Mesozoic Era Mesozoic time is between 248 and 65 million years ago. The word Mesozoic is from Greek and means "middle life." The Mesozoic Era is made up of three periods: the Cretaceous (65-146 Million Years Ago), Jurassic (146-208 Million Years Ago) and Triassic (208-245 Million Years Ago); Plants changed drastically; and there were many reptiles (i.e. Dinosaurs) and first primates, mammals, dinosaurs and birds appeared. Dinosaurs became extinct at the end of the Mesozoic Era. The three periods in this era are (from top down): Most recently the Cretaceous than the Jurassic period in the middle and lastly the Triassic period. The Cretaceous Period The Cretaceous Period, About 65-146 Million years ago: (From the Latin for chalk ("creta") because white cliffs along the English Channel between Great Britain and France were deposited at this period in time.) While some new dinosaurs appeared about this time, it is known as the last of the "Age of Dinosaurs"; first primates, angiosperms appear; breaking apart of the world-continent Pangaea begins. The Jurassic Period The Jurassic period was between 145 and 213 million years ago. The Jurassic period was named after the Jura Mountains between France and Switzerland, where they first studied rocks of this time period and the oilfields of the North Sea are from the Jurassic. The Jurassic oceans were full of fish, squid, and sea ammonite, and than the first frogs, salamanders, crocodiles, flying reptiles, birds; the land was lush with ferns and palm-like cycads which fed plant-eating dinosaurs; vicious carnivores would stalk the great herbivores; can you say "Tyrannosaurs rex" The Triassic Period The Triassic Period is about 213 and 248 million years ago. The word Triassic refers to the threefold division of rocks in Germany of the Triassic Period. In plate tectonics Pangaea existed and altered the global climate and changed ocean circulation; the appearance of modern conifers, cycadeoids; first turtles, than lizards, mammals, dinosaurs.

 

Paleozoic Era The Paleozoic Era is divided into seven periods: Most recently the Permian. Than what is generally called the "Carboniferous Period" which is really a common name for Pennsylvanian Period and Mississippian Period combined. Than comes the Devonian Period, Silurian Period, Ordovician Period, and finally the Cambrian Period. After that is PreCambian Eon. The Permian Period The Permian Period was the time between about 248 and 286 million years ago. Permian refers to the province of Perm, Russia, where rocks of the Permian period were first studied. In the Permian Period the first archosaurs ("ruling reptiles") appeared. The Permian Period ended with the largest mass extinction known. The Carboniferous Periods The Carboniferous A periods includes the Pennsylvanian and Mississippian periods which cover about 286 to 360 million years ago. Pennsylvanian Period The Pennsylvanian Period ran about 290 to 323 million years ago. It is named after the state of Pennsylvania where rocks of the Pennsylvanian age are widespread. The Pennsylvanian Period was, when coal swamp forests thrived in North America and the first conifers, insects and reptiles appeared. The Mississippian Period The Mississippian Period was about 323 to 362 million years ago and named after the Mississippi River valley, which contains good exposures of rocks of this age. The Mississippian Period was the first seed ferns; belemnoids, when the coal age began. The Devonian Period The Devonian Period was about 362 to 408 million years ago. Devonian was named after Devonshire, England, where rocks of the Devonian Period aged rocks were first studied. It was in the Devonian Period when plants and seeds evolved rapidly on land. Vertebrate animals ventured from the water to the land at this time. Probably Ohio's most famous fossil, the giant carnivorous fish Dunkleosteus, lived during the Devonian. The Silurian Period The Silurian Period 408 to 440 million years ago. Silurian is named after a Celtic tribe called the Silures. The Silurian Period is when life began to spread dramatically onto land. Ordovician Period The Ordovician Period was 440 to 510 million years ago. It is named after a Celtic tribe called the Ordovices. The Ordovician period was when the first vertebrates (jawless fishes) appeared and algae and insects colonized on land. The Cambrian Period the Cambrian Period was about 510 to 600 million years ago. It is named after Cambria, the Roman name for Wales, where rocks of the Cambrian age were first studied. This is when hard-bodied (That could leave Fossil, in this case it would be gastropods, bivalves, trilobites and brachiopod .) animals and plants first appeared. Fossils are the recognizable remains, such as bones, shells, or leaves, or other evidence, such as tracks, burrows, or impressions, of past life on Earth.

 
 
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