Chronology of Modern Ocean Basin Development
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1st stage
formation of supercontinent pangaea
formation of supercontinent pangaea: presence of _____? what oceans were not present?
panthalassa; atlantic and indian
2nd stage
breakup of pangaea
breakup of pangaea: formation of ______ and _____
laurasia, gondwanaland
breakup of pangaea: Presence of an east-west trending basin
tethys sea
3rd stage
separation of eurasian and north american plates
separation of eurasian and north american plates: • onset of _______ development • early formation of the ______ • _____ Atlantic still closed
mid-atlantic ridge north atlantic south
4th stage
separation of african and south american plates
separation of african and south american plates: early formation of the _____
south atlantic
5th stage
north and south atlantic continue to widen
north and south atlantic continue to widen: • onset of ____ and ____ plate collision • initial formation of the _____ • ____ and ________ achieve modern appearance
indian, asian himalayas north and south america
6th stage
expansion of the southern ocean
expansion of the southern ocean: major uplift of the _____ and formation of the ________
himalayas, tibetan plaeteau
7th stage
isolation of pacific and atlantic ocean
isolation of pacific and atlantic ocean: Closure of mid-American seaway as _____ and _____ plates collide
north and south american