a . Ariel A. Roth, “Some Questions about Geochronology,” Origins, Vol. 13, No. 2, 1986, pp. 75–76.
u “It has been estimated that just four volcanoes spewing lava at the rate observed for Paricutín [a Mexican volcano that erupted in 1943] and continuing for five billion years could almost account for the volume of the continental crusts.” Stansfield, p. 81.