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Retrieved from " https: Geologic time scales Geology timelines Geochronology Geology-related lists International Commission on Stratigraphy geologic time scale of Earth. Archived copy as title Articles with short description Use dmy dates from July Articles containing Latin-language text All articles with unsourced statements Articles with unsourced statements from September Articles with unsourced statements from June Articles containing potentially dated statements from September All articles containing potentially dated statements Articles contradicting other articles Commons category link is on Wikidata Articles which contain graphical timelines.

Views Read Edit View history. In other projects Wikimedia Commons. This page was last edited on 19 December , at By using this site, you agree to the Terms of Use and Privacy Policy. Sea level flooding of Doggerland and Sundaland. Late ' Tarantian '. Eemian interglacial , Last glacial period , ending with Younger Dryas. Middle ' Ionian ', ' Chibanian '. High amplitude ka glacial cycles. Rise of Homo sapiens. Further cooling of the climate. Spread of Homo erectus. Start of Quaternary glaciations. Rise of the Pleistocene megafauna and Homo habilis. Greenland ice sheet develops.

Zanclean flooding of the Mediterranean Basin. Messinian Event with hypersaline lakes in empty Mediterranean Basin. Moderate Icehouse climate , punctuated by ice ages and re-establishment of East Antarctic Ice Sheet ; Gradual separation of human and chimpanzee ancestors. Sahelanthropus tchadensis in Africa. Warmer during Middle Miocene Climate Optimum. Orogeny in Northern Hemisphere. Widespread forests slowly draw in massive amounts of CO 2 , gradually lowering the level of atmospheric CO 2 from ppmv down to around ppmv during the Miocene. Horses and mastodons diverse.

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Ancestor of apes and humans. Start of widespread Antarctic glaciation. Major evolution and dispersal of modern types of flowering plants. Creodonts , Condylarths , Uintatheres , etc. Appearance of several "modern" mammal families. Orogeny of the Alps in Europe begins.

Hellenic Orogeny begins in Greece and Aegean Sea. The Azolla event decreased CO 2 levels from ppm to ppm, setting the stage for a long period of cooling. Starts with Chicxulub impact and the K-Pg extinction event. Modern plants appear; Mammals diversify into a number of primitive lineages following the extinction of the non-avian dinosaurs.

First large mammals up to bear or small hippo size. Alpine orogeny in Europe and Asia begins. Flowering plants proliferate, along with new types of insects. More modern teleost fish begin to appear. Ammonoidea , belemnites , rudist bivalves , echinoids and sponges all common. Many new types of dinosaurs e. Tyrannosaurs , Titanosaurs , duck bills , and horned dinosaurs evolve on land, as do Eusuchia modern crocodilians ; and mosasaurs and modern sharks appear in the sea.

Primitive birds gradually replace pterosaurs. Monotremes , marsupials and placental mammals appear.

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Break up of Gondwana. Gymnosperms especially conifers , Bennettitales and cycads and ferns common. Many types of dinosaurs , such as sauropods , carnosaurs , and stegosaurs. Mammals common but small.

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First birds and lizards. Ichthyosaurs and plesiosaurs diverse. Bivalves , Ammonites and belemnites abundant. Sea urchins very common, along with crinoids , starfish, sponges , and terebratulid and rhynchonellid brachiopods. Breakup of Pangaea into Gondwana and Laurasia. Nevadan orogeny in North America. Rangitata and Cimmerian orogenies taper off.

Atmospheric CO 2 levels 3—4 times the present day levels — ppmv, compared to today's ppmv [33] [f]. Archosaurs dominant on land as dinosaurs , in the oceans as Ichthyosaurs and nothosaurs , and in the air as pterosaurs. Cynodonts become smaller and more mammal-like, while first mammals and crocodilia appear. Dicroidium flora common on land. Many large aquatic temnospondyl amphibians. Ceratitic ammonoids extremely common. Modern corals and teleost fish appear, as do many modern insect clades. Andean Orogeny in South America. Cimmerian Orogeny in Asia. Rangitata Orogeny begins in New Zealand.

Landmasses unite into supercontinent Pangaea , creating the Appalachians. End of Permo-Carboniferous glaciation. Synapsid reptiles pelycosaurs and therapsids become plentiful, while parareptiles and temnospondyl amphibians remain common. In the mid-Permian, coal -age flora are replaced by cone -bearing gymnosperms the first true seed plants and by the first true mosses.

Beetles and flies evolve. Marine life flourishes in warm shallow reefs; productid and spiriferid brachiopods, bivalves, forams , and ammonoids all abundant. Permian-Triassic extinction event occurs Ma: Ouachita and Innuitian orogenies in North America. Altaid orogeny in Asia.

Hunter-Bowen Orogeny on Australian continent begins c. Winged insects radiate suddenly; some esp. Protodonata and Palaeodictyoptera are quite large. Amphibians common and diverse. First reptiles and coal forests scale trees , ferns, club trees , giant horsetails , Cordaites , etc. Highest-ever atmospheric oxygen levels. Goniatites , brachiopods, bryozoa, bivalves, and corals plentiful in the seas and oceans. Uralian orogeny in Europe and Asia. Variscan orogeny occurs towards middle and late Mississippian Periods. Large primitive trees , first land vertebrates , and amphibious sea-scorpions live amid coal -forming coastal swamps.

Lobe-finned rhizodonts are dominant big fresh-water predators. In the oceans, early sharks are common and quite diverse; echinoderms especially crinoids and blastoids abundant.

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Corals , bryozoa , goniatites and brachiopods Productida , Spiriferida , etc. Glaciation in East Gondwana. Tuhua Orogeny in New Zealand tapers off. First clubmosses , horsetails and ferns appear, as do the first seed -bearing plants progymnosperms , first trees the progymnosperm Archaeopteris , and first wingless insects.

Strophomenid and atrypid brachiopods , rugose and tabulate corals, and crinoids are all abundant in the oceans. Goniatite ammonoids are plentiful, while squid-like coleoids arise. Trilobites and armoured agnaths decline, while jawed fishes placoderms , lobe-finned and ray-finned fish, and early sharks rule the seas. First amphibians still aquatic. First vascular plants the rhyniophytes and their relatives , first millipedes and arthropleurids on land. First jawed fishes , as well as many armoured jawless fish , populate the seas.

Sea-scorpions reach large size. Tabulate and rugose corals, brachiopods Pentamerida , Rhynchonellida , etc. Trilobites and mollusks diverse; graptolites not as varied. Also continued into Devonian period as the Acadian Orogeny , above. Taconic Orogeny tapers off. Lachlan Orogeny on Australian continent tapers off. Invertebrates diversify into many new types e. Early corals , articulate brachiopods Orthida , Strophomenida , etc. Conodonts early planktonic vertebrates appear. First green plants and fungi on land.

Ice age at end of period. Major diversification of life in the Cambrian Explosion. Numerous fossils; most modern animal phyla appear. First chordates appear, along with a number of extinct, problematic phyla. Reef-building Archaeocyatha abundant; then vanish. Trilobites , priapulid worms, sponges , inarticulate brachiopods unhinged lampshells , and numerous other animals.

Anomalocarids are giant predators, while many Ediacaran fauna die out. Prokaryotes , protists e. Petermann Orogeny on the Australian continent tapers off — Ma. Ross Orogeny in Antarctica. Adelaide Geosyncline Delamerian Orogeny , majority of orogenic activity from — Ma.


Lachlan Orogeny on Australian continent , c. Atmospheric CO 2 content roughly 15 times present-day Holocene levels ppmv compared to today's ppmv [33] [f]. Good fossils of the first multi-celled animals. Ediacaran biota flourish worldwide in seas. Simple trace fossils of possible worm-like Trichophycus , etc. First sponges and trilobitomorphs. Enigmatic forms include many soft-jellied creatures shaped like bags, disks, or quilts like Dickinsonia. Taconic Orogeny in North America. Aravalli Range orogeny in Indian Subcontinent. Beginning of Petermann Orogeny on Australian continent.

Beardmore Orogeny in Antarctica, — Ma. Possible " Snowball Earth " period. Rodinia landmass begins to break up. Trace fossils of simple multi-celled eukaryotes. First radiation of dinoflagellate -like acritarchs. Grenville Orogeny tapers off in North America. Pan-African orogeny in Africa. Narrow highly metamorphic belts due to orogeny as Rodinia forms. Platform covers continue to expand. Green algae colonies in the seas. Grenville Orogeny in North America. First complex single-celled life: Columbia is the primordial supercontinent. Kimban Orogeny in Australian continent ends.

Yapungku Orogeny on Yilgarn craton , in Western Australia. The atmosphere becomes oxygenic. Vredefort and Sudbury Basin asteroid impacts. Early Ruker Orogeny in Antarctica, 2,—1, Ma. Glenburgh Orogeny, Glenburgh Terrane , Australian continent c. Kimban Orogeny, Gawler craton in Australian continent begins. Bushveld Igneous Complex forms. Stabilization of most modern cratons ; possible mantle overturn event. Abitibi greenstone belt in present-day Ontario and Quebec begins to form, stabilizes by 2, Ma. First stromatolites probably colonial cyanobacteria. Humboldt Orogeny in Antarctica. First known oxygen-producing bacteria.

Oldest cratons on Earth such as the Canadian Shield and the Pilbara Craton may have formed during this period. Simple single-celled life probably bacteria and archaea. Early Imbrian Neohadean unofficial [i] [m]. Indirect photosynthetic evidence e. This era overlaps the beginning of the Late Heavy Bombardment of the Inner Solar System , produced possibly by the planetary migration of Neptune into the Kuiper belt as a result of orbital resonances between Jupiter and Saturn.

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Oldest known rock 4, to 3, Ma. Stay updated via RSS. Click to email this to a friend Opens in new window Click to share on Facebook Opens in new window Click to share on Twitter Opens in new window. March 18, at 4: March 6, at April 14, at February 20, at 5: February 15, at 6: Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in: Email Address never made public. Post was not sent - check your email addresses! Sorry, your blog cannot share posts by email.