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Orgyia antiqua
Caterpillar with tufts, 4 big yellow tufts along back, and several black antenna-like projections.
On driftwood on the beach of the Pacific Ocean. Closest trees were pine and alder; several species of broadleaved plants were around, too. Sitka spruce and Douglas fir is also in the area.
No doubt a member of Lymantriidae, the tussock moths, but I don't know which species.