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Contents great events which moulded life
- 1. Great Events Which Moulded Life v CONTENTS 0.0 Prayer 0. i-ii 0.1 Preface i - iv 0.2 Contents v - xiii 1 Introduction 1-2 2 Part I : Precambrian Super Eon : 3 -13 Archaean & Proterozoic Eons ( 3.5 Ba-542 Ma ) : i Archaean Eon : 4-7 Beginning of Life- Unicellular prokaryotes : Archaea , bacteria ; Photosynthesis begins. ii Proterozoic Eon : 8-10 Eukaryotes evolve ; Sexual reproduction begins Endosymbiosis
- 2. vi Multicellular life forms ; Protista evolve Trinity rules the world iii Ediacaran period 11-13 Animals join the trinity Variety of forms 3 Part II : Phanerozoic Eon (541 Ma--0 ) 14-85 I Ikzkphu dky Paleozoic Era (541 – 250 Ma) i Cambrian period : 15-17 Explosion of life Many Phyla evolve Age of Algae & Invertebrates ii Ordovician Period : 18-21 Bacteria, Protista , Algae , Sponges, Trilobites Jawless fishes common
- 3. vii Invasion of land begins I EXTINCTION : 85% Life forms eliminated @ Ordovician / Silurian junction iii Silurian period : Revival 22-24 Lichens invade rocky coasts; First Land plants-Bryophytes Corals , Arthropods, Fishes iv Devonion period : 25-28 First sporing vascular plants First Forests Arthropods on Land flourish Age of Fishes in Sea II EXTINCTION :80% Species destroyed v Carboniferous : Revival 29-31 Vast Swamp forests, Age of Ferns ;
- 4. viii Age of Amphibians and Arthropods Reptiles appear vi Permian Period : 32-38 Funji , Seed ferns , Early Gymnosperms Arthropods & Reptiles flourish III EXTINCTION : 96% species Perish @ Permian / Triassic junction II e/; dky Mesozoic Era ( 252--65 Ma ) Age of Gymnosperms Age of Reptiles i Triassic period : Revival 39-44 Conifers ,Cycads, Ginkos and Ferns flourish
- 5. ix First Dinosaurs appear ; First Mammals appear : IV EXTINCTION : 50% species perish ii Jurassic period : Revival 45-50 Age of Dinosaurs First Birds ; Age of Conifers First Angiosperms iii Creatceous : 51-56 Birds & flying dinosaurs roam the sky Angiosperms spread Gymnosperms continue V EXTINCTION : 75 % species wiped out @ Cretaceous /Tertiary Junction; Dinosaurs extinct
- 6. x III vk/kqfud dky Coenozoic Era (65 Ma-0) 57 Angiosperms dominate Mammals Dominate Birds proliferate Homo - Man appears 1 Tertiary (Paleogene & Neogene) : 59-75 Paleocene epoch Revival Angiosperms diversify Jungles ; Grasses grow more Birds multiply diversify Mammals diversify Proto primates appear Corals, molluscs and insects proliferate 2 Eocene epoch 62-63 India collides with Asia ?
- 7. xi Forests Spread All species multiply First Primates ; first horses 3 Oligocene epoch 64-68 World at Cross roads Continents drift & shift Forests & grasslands First camels; first monkeys first mastadons first pinnipeds appear Giant mammals & birds 4 Miocene epoch 69-70 Grasslands spread Plants & animals modern First Apes ; first deer First Kelp forests
- 8. xii Whales , seals spread 5 Pliocene epoch 71-75 Grasslands spread First Hominins Great American Exchange Giant animals ; first bovines ii Quarternary period : 76-85 Pleistocene epoch 76-81 Glaciations, extinctions revivals Angiosperms dominate Mammals, birds dominate Giant animals appear, live & become extinct First homo First Homosapien
- 9. xiii First Lions & Tigers Diatoms;foraminifera -more 2 Holocene 82-85 Homosapiens dominate Mammals & birds multiply Angiosperms continue to Dominate . Cultivated plants flourish VI EXTINCTION : BEGINS ? Began by Man ! A big question ? Upsanhar Conclusion 86