C7+Age+of+Earth+Initial+Ideas



http://en.wikipedia.org/wiki/Charles_Lyell

http://www.stanfords.co.uk/articles/famous-travels/lyell-principles-of-geology,301,AR.html

http://abyss.uoregon.edu/~js/lectures/age_of_the_earth/age_of_the_earth.html

[]