Geologic Time Scale PDF
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This document presents a geologic time scale, detailing the different eras, periods, and epochs in Earth's history. It features illustrations of various species from each period. It's a helpful resource for learning about the evolution of life on Earth.
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Eons: Precambrian: Earliest span of time Phanerozoic: Everything since Camels often sit down carefully - perhaps their joints creak Eras:...
Eons: Precambrian: Earliest span of time Phanerozoic: Everything since Camels often sit down carefully - perhaps their joints creak Eras: Periods: Paleozoic Cambrian Mesozoic Ordovician Cenozoic Silurian Paleozoic Devonian “Age of Invertebrates” Carboniferous) Epochs: Permian Paleocene Triassic Mesozoic Eocene Jurassic “Age of Reptiles” Oligocene Cretaceous Paleogene Cenozoic Miocene Neogene “Age of Pliocene Mammals” Quaternary Pleistocene Holocene We are living in the Phanerozoic Eon, Cenozoic Era, Quaternary Period, Holocene Epoch……..BUT Put Eggs On My Plate Please Hannah Artist's rendition of life in the Cambrian Sea. For a long time, these fossils were the oldest scientists had found. Haikouichthys ercaicunensis Artist's rendition of marine life in the Ordovician Period. Marine life was abundant and diverse. Nautilod Sea star Leptaena Bryzoans Spores found in 480 million-year-old rock bring the fossil record in line with molecular estimates of when plants first adapted to life on land. Artist's rendition to silurian life. Armored fish: Dunkleosteus terrelli Artist's rendition of life in devonian. Trees and land animals ara part of the scene. Ichthyostega Tiktaalik The fern-like leaves of Archaeopteris, one of the first tree-like plants. It grew to an average height of about 10 meters, produced spores, and had a global distribution. Artist's rendition of a Carboniferous swamp. This ecosystem dominated this time period. Amphibians: Dominant vertebrates, such as Eryops and Diplocaulus Early reptiles, Hylonomus and Anthracosaurus Large dragonfly, Meganeura and a millipede Arthropleura. Lebachia Medullosa Artist's rendition of Permian life. Most of these species will be extinct by the end of the Period. Synapsids: Early mammal-like reptiles, such as Dimetrodon and Edaphosaurus. Therapsids: Advanced mammal-like reptiles, like Gorgonopsids and Lystrosaurus. Ichthyosaurus fossil, a marine reptile with a dolphin- like appearance and which gave birth to living young. Proganochelys quenstedti Clatrotitan scullyi Life reconstruction of Mambawakale ruhuhu an Archosaurs which is an early relative of crocodiles and dinosaurs Cycads conifers Ginkgo Artist's rendition of Jurassic life. Large reptiles dominated the land, and birds appeared. Artist's rendition of life in the Cretaceous. Most of these species will not survive the mass extinction at the end of this period. Note that the supercontinent Pangea is breaking apart. Archaefructus Small mammals like Purgatorius and early primates like Plesiadapis Ischyromys, The 60 cm (2 ft) long creature is one of the Large, flightless bird oldest known rodents. Early Ungulates: Ancestors of modern horses, rhinos, and elephants Early bats like Icaronycteris Standing 16 feet tall at the shoulder and weighing 20 tons, Paraceratherium was the largest mammals to ever walk the Earth. A team of researchers from the George Washington University and the Institut Català de Paleontologia Miquel Crusafont (ICP) identified a new genus and species of small ape that existed before the evolutionary split of humans/great apes (hominids) and gibbons (the “lesser apes” or hylobatids). Australopithecus afarensis (Lucy)
