Eagle Creek Trail High Bridge Bluff

As you relax at High Bridge, look up and you will see a great example of the layered basalt flows that make up most of the Columbia Gorge geology. Here, the top flow has been reduced to a tiny pinnacle, while the layers below show the characteristic "postpile" joint pattern that gives the name "pillar basalt". Also evident is the wide variation in flow thickness, from a few feet to hundreds of feet.

These flows are thought to have originated in eastern Oregon and Washington, and cover thousands of square miles across the Pacific Northwest.

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