Slate from Poultney, Vermont
Vermont slates formed 475 million years ago during the Taconic Orogeny, a period of mountain building. Sedimentary rocks, such as shales or siltstones were metamorphosed, and they became slate.
60. Slate
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Slate from Poultney, Vermont
Vermont slates formed 475 million years ago during the Taconic Orogeny, a period of mountain building. Sedimentary rocks, such as shales or siltstones were metamorphosed, and they became slate.