English: Outline and outcrops of Siletzia, an Eocene geological formation forming the basement rock under western Washington and Oregon and the southern tip of Vancouver Island. Follows a figure from Robert Duncan (1982).
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{{Information |Description ={{en|1=Outline and outcrops of Siletzia, an Eocene geological formation forming the basement rock under western Washington and Oregon and the southern tip of Vancouver Island. Follows a figure from Robert Duncan (1982).}}...