Marine terraces and sea stacks from Cuffey’s Cove off the Mendocino coast in Elk, Calif., in October 2025. (Rowena Forest via Bay City News)

I recently led a field trip at the Mendocino Coast Botanical Gardens to observe, enjoy, and ponder the grandeur of Mendocino’s coastal landforms. In the process, I pecked at the tip of the iceberg of our understanding of the immense and dynamic forces that are actively shaping California’s evolving coastline.

The landscape before us is continually being transformed by the elements, by the ocean and wave action, and by tectonics. All of these mechanisms act as erosional as well as depositional forces on the landscape — perpetually building it up and then taking it away.

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Rowena Forest is a physical geographer and science writer at Cal Geographic. To follow her in-depth explorations and investigations of California’s living landscapes, and for upcoming field trips please...