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Originally Posted by kennyc
BTW the question in my mind that triggered this was whether the heat is from the original formation that just had not cooled...not sure I got a answer yet..
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Oh, if that's your question-- no. Most of the Earth's current core heat is from radioactive decay. The heat from the Earth's initial formation ran out literally billions of years ago. Earth would have been a dead lump long before the Cambrian. In fact, that was one of the major "thorns in the side" of evolutionary theory before the discovery of radioactivity in the 20th century. Without radioactive heating, the Earth just simply can't be old enough.
http://skepticwiki.org/index.php/Lor...in%27s_Blunder