|Professional Paper 1643: FIGURE 6|
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Stratigraphy and age of geologic units occurring in northern Whidbey Island area (figs. 1, 3). Ages for bedrock units based on Johnson (1984a), Whetten and others (1988) and Rau and Johnson (1999). Ages for Quaternary units based mainly on Blunt and others (1987), Berger and Easterbrook (1993), Easterbrook (1994a, b), Porter and Swanson (1998), and Troost (1999).
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