See N. Coch and A. Ludman, Physical Geology (3d ed. 1991); L. S. Fichter et al., Earth Materials and Earth Processes (3d ed. 1991); L. Margulis and L. Olendenski, Environmental Evolution: Effects of the Origin and Evolution of Life on Planet Earth (1992); R. H. Dott, Jr., and D. R. Prothero, Evolution of the Earth (5th ed. 1994); E. A. Keller, Environmental Geology (7th ed. 1996); S. Chernicoff and C. Fox, Essentials of Geology (1998); E. J. Tarbuck and F. K. Lutgens, The Earth: An Introduction to Physical Geology (6th ed. 1998).
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