THE AQUINNAH CLIFFS (Gay Head, Martha’s Vineyard) are composed of one hundred and fifty feet of sediment from six glaciers – including red and white clays, green sands, white quartz, black organic soil, and lignite. They tell the story of the past hundred million years one colorful layer at a time. Clay from the Cliffs in modern days has been used for bricks, pottery, and paint. Early versions of Aquinnah Light were built with bricks made from Aquinnah clay. While there once was more red and purple in the Cliffs, those colors have eroded away. Now the Cliffs are protected as a National Historic Landmark: climbing and the removal of clay are both prohibited by law.