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__Period ____Age __Mountains __Climate
CENOZOIC >Quaternary ........ 3 ............................... Ice age >Tertiary ............ 70 ...... Alpine .................................................................... Warm MESOZOIC ............................................................. Glaciations >Cretaceous ...... 135 ...... Laramide >Jurassic ........... 180 ................................ Warm >Triassic ............ 255 ................................ Warm
PALEOZOIC .............................................................. Glaciations >Permian ............ 270 ....... Hercynian >Carboniferous .. 350 ............................... Warm >Devonian .......... 400 ....... Caledonian ....... ? >Silurian ............. 440 ................................Warm >Ordovician ........ 500 ...............................Warm >Cambrian .......... 600 ......................... Glaciation ............................................. Charnian ..................................................................... Warm
PRECAMBRIAN
>Crust formed .....4500
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