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10 The presence of stromatolites indicates that shallow seas covered much of earth during intervals in this period. 11 Nearly half of the valuable minerals deposits in the world occur in the rock of this period.
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geological timescale
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Shelled brachiopods appear. Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop.
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colonies of tiny invertebrates call graptolites flourished and vertebrates appear, fish did not have jaws or teeth and there bodies were covered with bony plates.
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vascular land plants animals, such as scorpions began to evolve on land. Eurypterids(sews scorpion), sea stars and coral become more common.
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Age of fishes, fish that can breath out of the water and spend time on land from.
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swamps and forest cover the land
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Giant cockroaches appear. coal deposits form.
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enviromental change causes mass exctincion of sea invertebrates (trilobites and eurypterids) as the seas retreat
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The very little plant life during this period. whoa those dines are getting big and dominate land- lizard hipped and bird-hipped appear -carnivores and herbivores have arrived
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flying reptiles called pterosaurs are in the air now.
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first flowering plants appear. impact hypothesis-dinasaur mass extinction.
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First primates evolve. small rodents evolve
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flying squirrels, whales an bats appear
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Himalayas develop due to uplifting caused by the indian subcontinent and eurasian continents folding. many early mammal become extinct, clams and snails flourish.
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mediterranian sea dries up and refills several times due to tectonic plates forces dn dropping sea levels
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Various species migrated between continents across land bridges. first modern horses appear
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species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct. modern humans appeared and are hunters.
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the last glacial period ended and sea levels rose, great lakes formed.
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some scientist believe that human kind has caused mass exctinctions of plant and animal species, polluted the oceans and altered the atmosphere. there is argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800s other think it began with the atomic age in the 1950s.
