Figure 1: Schematic geologic map of Washington.

Numbers here refer to locations of stratigraphic columns shown in figure 2.

Key:

BB is the Bellingham Basin;
C -- Chumstick Basin;
SJI -- San Juan Islands;
MR -- Mount Ranier;
CB -- Chehalis Basin;
G -- Grays Harbor Basin;
T -- Tofino-Fuca Basin.

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Courtesy of Torrent Energy