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Perhaps you recognize this map. It was produced by the National Geographical Data Center in 1996. It shows the coastal age of the ocean bottom, which you know is no older than 185 million years old not one acre older, anywhere.Yet, this map misrepresents. It should show us 10 million year segments going back in time. Instead it uses a rainbow of 7 plus colors to indicate arbitrary breaks in age. Green, for example, is 35 million years, while red shows our most recent 9.6 million years, and this red almost blends in with the orange. Very pretty, but confusing. In the second map I have actually broken the map into 10 million year segments going back using the same information. |
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Simple calculation shows that the red spread area represents a minimum of 5% of Earth's surface. It's actually closer to 8%. But think of it, this same 5 % added on for a same size Earth for 200 million years would make a surface the size of the whole Earth. The segments are exponentially smaller going back in time. In fact, each segment's square mileage is 100% greater than the one that came before it and 50% less than the square mileage of the previous 10 million years. (Or near that family of figures.) Please examine the chart below and the second map.
Are my calculations wrong?? Please check my figures against yours, or any ones. Between 5 and 8 percent of the Earth's surface did not exist
10 million years ago. Are the undersea rifts spreading faster
and 'subducting' faster? Or is the Earth simply growing faster? Try this one. In simple terms over 50% of the under ocean rift area exposed itself in the last 60 million years, compared to the other half taking 125 million years or more or to put it another way Two thirds of the Oceanic Plate two thirds, was created since the dinosaurs became extinct. (Or 40% of the whole Earth.)
Special note for Paleontologists: |
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