fig2thum.jpg (75104 bytes)Figure 3.  Interpretive map showing the surficial geology of the lower beach face, inner shelf, and middle shelf of the Columbia River littoral cell. The 'Surficial geology' is ordered by relative age with 'Jetty' being the youngest and 'Outcrop' being the oldest.   'Sand dollars' are separate as they are of biological origin.  Click on the figure to view a larger scale image.

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