Mon harmonieux padlet by Masaharu HAYASHIKAWA https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy en-us 2023-01-09 09:34:47 UTC 2023-03-19 14:04:44 UTC hello@padlet.com Ice age: 2,6 mya, 650 mya, 443 mya. The first Ice age was called the cryogenian. The second one was called Andean Saharan. The third was Quarternary. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437505522 2023-01-09 09:38:38 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437505522 First life: 3,5 bya The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437518296 2023-01-09 09:50:20 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437518296 First fish with jaws: 420 mya. The evolution fish began during the Cambrian explosion 530 millions years ago. The first jaw fish is the Placoderms. It mostly wiped out by the late devonian extinction event 375 mya. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437519248 2023-01-09 09:51:06 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437519248 Major asteroid impact: 2 bya The most kwoned asteroid impact are the Chicxulub impact and the Popigai impact. The Chicxulub impact was the impact that occured 65 millions years ago in the End of the Cretaceous Period. The impact created a large crater knowned as the "The Chicxulub Crater". It is 93 miles wide and 12 miles deep. This impact created one of the biggest and massive extinction of dinosaurs called the KT boundary extinction. The second impact was about 35 millions years ago called the Popigai impact. The asteroid slammed into the area that is now known as the Taymyr Peninsula of northern Siberia, Russia. The asteroid size was between 5 to 8 killometers and the crater was 100 km in diameter and was between 150 to 200 meters. This impact created the Eocene Oligocene extinction event which was one of the seven deadly extinction in history mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437520762 2023-01-09 09:52:28 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437520762 Jurassic period ends: 0,6 mya The Jurassic is a geologic period and stratigraphic system that spanned from the end of the Triassic Period 201.3 million years ago (Mya) to the beginning of the Cretaceous Period, approximately 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437528790 2023-01-09 09:59:58 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437528790 Mass extinction due to ice age 650 mya and 443 mya. Over 60 species and 86 % of living species like mammoth, mastodo, stag moose, giant beaver, and giant sloth died during the ice age,which last over 1 million years. The scientist are still arguing about the responsibility of the extinction and were mostly humans that killed every species that they saw. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437533161 2023-01-09 10:04:04 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437533161 Pangea: 200 mya. Pangean was surrounded by an single ocean called Panthalassa and it was fully assembled by the early Permian Epoch( 299 milions and the super continent began to seperate about 200 millions in the early Jurassic Epoch. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437537348 2023-01-09 10:08:17 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437537348 Mammals evolving: 200 mya Since the initial appearance of their synapsid progenitors in thePennsylvanian sub-period of the late Carboniferous period, mammalshave through a number of stages in their evolution. There werenumerous synapsid animals that resembled mammals by the middle ofthe Triassic. Synapsids from this time period include Dryolestes, whichis more closely connected to current placentals and marsupials than tomonotremes, and Ambondro, which is more closely related tomonotremes. The lineage leading to today's mammals split up in theJurassic. The eutherian and metatherian lineages then split apart;the metatherians are creatures that are more closely connected tomarsupials, whereas the eutherians are creatures that are more closelyrelated to placentals. Since the first known eutherian, Juramaia, existedin the jurassic period 160 million years ago, this divergence must havetaken place around the same period. mhayashikawa28 https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437538351 2023-01-09 10:09:17 UTC https://padlet.com/mhayashikawa28/2scdoyfo2rzs2yjy/wish/2437538351