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It could have been the Alleghenian or Appalachian Mountain ranges. Based on the amount of sediments from the erosion of the Appalachian Mountains, it is estimated that they were close in height or taller than the Himayan Mountains.

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Q: What was the tallest mountain range 300 million years ago?
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Everest was formed about 60 million years ago


How old is the Appalachian Mountain Range?

About a million years old


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