The Greek islands and their beaches; By Gary Griggs

The Eastern Mediterranean, including dozens of Greek islands, have a complex geologic history. This area has been the site of both a primitive ocean that existed 250 million years ago that preceded the present day Mediterranean Sea, and also an area where several very large tectonic plates have been converging for eons.

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Big Talbot Island’s Blackrock Trail; By Cecelia Dailey

The locals call it “lava beach”—a misnomer which leads some to believe the unique formation found here are igneous in origin. But these mystifying “black rocks” crumble to the touch, staining the hands, feeling gritty with sand. Although many are black, these “rocks” are sometimes light colored, deep red or burnt brown.

Terraces and Towns; By Gary Griggs

The geologic history of California’s north coast is evident in the typically steep relief and coastal landforms. This is an area where a drive along much of the narrow lanes of State Highway One along the often steep coast is always an adventure and where it’s never wise to take your eyes off the road for very long. Most of the beaches occur at the mouths of the coastal streams.