![Chuckanut Drive, Wa](http://static.flickr.com/3524/4050749979_08544fdb2d_m.jpg)
The siltstones, sandstones, mudstones and conglomerates of the Chuckanut Formation were laid down about 40-54 million years ago during the Eocene epoch, a time of luxuriant plant growth in the subtropical flood plain that covered much of the Pacific Northwest.
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