[fish hawk]

Common sense tells me that if there is proof that tropical zones now lay beneath the North and South Poles, it would only make sense that there were arctic conditions in the equator zone. Either the surface of the earth shifted or the tilt of 23 degrees was different millions of years ago.

[egannacht]

From what I’ve read, ice existed at the equator and the poles were tropical due to system overloads. Ice reflects heat and there is a tipping point in which the earth froze completely. The ice unfroze with volcanic activity. Which leads to tropics at the poles. Sometimes the planet has enormous heat from an overactive volcanic cycle creating excessive heat trapped by the atmosphere of escaped gasses that act as a blanket. Another reason for radical changes in season is ice or lands opening up or cutting off ocean currents.

[RegulatorCountry]

I’d imagine gettng smacked by an asteroid of sufficient scale to wipe out the predominant species on the planet and create the Gulf of Mexico, would be enough to set things reeling pretty well.

[Ernest_at_the_Beach]

The proof is there....see this thread:

Snowball Earth: New Evidence Hints at Global Glaciation 716.5 Million Years Ago

In this photo from Canada's Yukon Territory, an iron-rich layer of 716.5-million-year-old glacial deposits (maroon in color) is seen atop an older carbonate reef (gray in color) that formed in the tropics. (Credit: Francis A. Macdonald/Harvard University)

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This work was supported by the Polar Continental Shelf Project and the National Science Foundation's Geobiology and Environmental Geochemistry Program.

[Ernest_at_the_Beach]

I think the breakup and movement of the earth surfaces would be the more accepted hypothesis....

We know about plate tectonics and their resulting earthquakes and volcanoes.

[Ernest_at_the_Beach]

Good article :

The Mid-Ocean Ridge

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It is the longest mountain chain, the most active volcanic area and until recently, the least accessible region on the earth. New maps reveal striking details of how segments of the Ridge form and evolve.

After cruising southeast 2,500 kilometers from the Scripps marine facility in San Diego, we intersected the crest of the East Pacific Rise, located at a depth of about 2.5 kilometers. The Rise marks the boundary between the Pacific and Cocos tectonic plates, each a slab of the earth's crust and upper mantle. The plates separate at a rate of about 120 millimeters per year (twice the rate at which a fingernail grows). As the plates move apart, cracks form along the crest of the rise, allowing molten rock to seep up from the mantle. Some of the molten rock overflows onto the ocean floor in tremendous eruptions. The magma then solidifies to form many square kilometers of new oceanic crust each year. Only a few kilometers above this activity, we felt like Lilliputians crawling along the spine of a slumbering giant that might awaken at any time.