a . Nevins, pp. 80 – 81.
u George C. Kennedy, “The Origin of Continents, Mountain Ranges, and Ocean Basins,” American Scientist, Vol. 47, December 1959, pp. 491–504.
u Roth, “Some Questions about Geochronology,” pp. 65–67.
u “North America is now being eroded at a rate that could level it in a mere 10 million years ...” Dott and Batten, p. 133.