beginning and quickly summarize how it all happened. Earth’s history is categorized into two eras‚ and then categorized by periods. The two eras are Paleozoic era‚ and Mesozoic era. Paleozoic era - (560 to 276 million years ago): This is the period where the first fish‚ corals‚ shellfish‚ insects‚ spiders‚ and swamp forests appeared. Mesozoic era - (350 to 65 million years ago)We are most interested in this era. This era contained 3 periods: Triassic period‚ Jurassic period‚ Cretaceous period. Triassic
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<b>Intro:</b> <br><li>Sixty-five million years ago‚ some phenomenon triggered mass extinctions on the lands and in the oceans so profound that they define the geological boundary between the older Mesozoic Era‚ often called the "Age of Reptiles‚" and the modern Cenozoic Era‚ the "Age of Mammals." <br><li>On a finer scale‚ the extinctions define the boundary between the Cretaceous (geological symbol‚ "K")‚ and Tertiary ("T") periods. This mass extinction is usually referred to as the K-T extinctions
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Cambrian Period (544m.y.- 505 m.y.) * The Rise of the fish - The Ordovician Period (505 m.y.-440 m.y.) * Venturing on land - the Silurian Period (440 m.y. - 410 m.y.) * Invasion of the land - the Devonian period (410m.y. - 360m.y.) * Reptiles and Conifers - the Carboniferous Period (360m.y. - 286m.y.) * Pangea - the Permian period (286m.y.- 248m.y.) * Mammals and dinosaurs - the Triassic period (248m.y.-213m.y.) * Dinosaurs and birds - the Jurassic period (213 m.y. - 145 m
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Megalosaurus “Big Reptile” Discovered by Reverend William Buckland Realized it was a reptile based on the teeth Thought it should have a build of like a monitor lizard or giant crocodile- thought they were quadrupedal Early interpretations of dinos were based off this idea- they were way off Iguanodon “Iguana tooth” Discovered by Gideon Mantell First described Herbivorous dino Caused a lot of excitement because a plant eating dino had not been found yet Dinosauria “fearfully great reptiles” Named by Sir
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million years‚ from the beginning of the Jurassic (about 200 million years ago) until the end of the Cretaceous (66 million years ago)‚ when the Cretaceous–Paleogene extinction event led to the extinction of most dinosaur groups at the close of the Mesozoic Era. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic Period and‚ consequently‚ they are considered a subgroup of dinosaurs in most modern classification systems.[1][2] Some birds survived the extinction
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My journal entry began when I started learning about the eras of geologic time like the Paleozoic‚ Mesozoic‚ and Cenozoic eras. Although the various time periods were all very interesting‚ I found the Paleozoic era to be the most fascinating.’Paleo’ means ancient or way early times in Greek and therefore Paleozoic means ancient life. This era was divided into six major parts. These parts are named the Cambrian‚ Ordovician‚ Silurian‚ Devonian‚ Carboniferous‚ and Permian periods. The Ordovician period
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earth for over 165 million years‚ till 65 million years ago. They were huge monsters‚ even bigger than elephants. The word "dinosaur" was taken from a Greek word which means terrible lizard. But they weren’t exactly lizards. Lizards are one type of reptile and dinosaurs are another type. Not all dinosaurs were giants. Some dinosaurs were no bigger than small dogs. The smallest kind was about the size of a chicken. No human being has seen a living dinosaur but‚ scientists have many ways of learning
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* Algae & bacteriafirst life * Corals‚ sponges & snailsfirst animals 2. PALEOZOIC ERA * 570 mil-225 mil * Beginningonly sea animals & plants * Laterfirst fish‚ amphibians‚ early reptiles & giant insects‚ first land animals & plants 3. MESOZOIC ERA * 225 mil-65 mil * Dinosaurs‚ first mammals and birds‚ pine trees and ferns‚ first traces of flowering plants 4. CENOZOIC ERA * 65 mil-now * Development of birds and mammals (first traces)
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Chapter 34 Vertebrates Overview: Half a Billion Years of Backbones * Vertebrates are named for vertebrae‚ the series of bones that make up the vertebral column or backbone. * There are about 52‚000 species of vertebrates‚ far fewer than the 1 million insect species on Earth. * Plant-eating dinosaurs‚ at 40‚000 kg‚ were the heaviest animals to walk on land. * The biggest animal that ever existed is the blue whale‚ at 100‚000 kg. * Humans and our closest relatives are
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Aachenosaurus – actually a piece of petrified wood Aardonyx "Abdallahsaurus" – nomen nudum‚ probably Brachiosaurus or Giraffatitan Abelisaurus Abrictosaurus Abrosaurus Abydosaurus Acanthopholis Achelousaurus Achillesaurus Caenagnathus – probable junior synonym of Chirostenotes Calamosaurus Calamospondylus Fox‚ 1866 "Calamospondylus" Lydekker‚ 1889 – preoccupied name‚ now known as Calamosaurus Callovosaurus LONGEST The longest dinosaurs were sauropods; they were gigantic‚ slow-moving
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