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Chasing Wilson 1

This video explores the Wilson Cycle, the grand geologic process that explains how continents repeatedly rift apart, form oceans, collide, and build mountains over hundreds of millions of years. A key chapter of the Wilson Cycle in eastern North America is the Grenville Orogeny (about 1.3–1.0 billion years ago), when continental collision built a massive mountain belt. The deep crystalline roots of that ancient mountain system are still exposed today as basement rocks across the eastern United States. This video highlights classic examples of Grenville-age basement rocks, including: • Adirondack Mountains, New York — famous for vast bodies of anorthosite, a rare feldspar-rich igneous rock formed deep in the crust • Shenandoah National Park, Virginia – Old Rag Mountain — Old Rag Granite, a Grenville-age granitic gneiss – Stony Man Mountain — Pedlar Formation basement beneath Catoctin greenstone • Grandfather Mountain, North Carolina — Wilson Creek Gneiss exposed in the Grandfather Mountain Window • Cranberry, North Carolina — Cranberry Gneiss, part of the ancient Blue Ridge basement • Reading Prong, Pennsylvania — Henderson Gneiss, another exposure of Grenville crust Together, these rocks belong to the Grenville Province and are preserved today within geologic regions such as the Adirondack Highlands, the Blue Ridge Province, and the Reading Prong. They represent the deep roots of an ancient continental collision, later uplifted and exposed through erosion during multiple Wilson Cycles, including the formation of the Appalachian Mountains. This is the story of deep time, continental assembly, and the oldest rocks you can hike on in eastern North America.