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South wall of Purgatoire Canyon near Sopris: a general view showing the Raton basal conglomerate, the unconformity between a coal bed and Vermejo formation. Las Animas County, Colorado. 1909. Plate 13-A, with graphics, in U.S. Geological Survey Professional Paper 101. 1917.
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A characteristic outcrop of the Trinidad sandstone, about 4 miles north of Trinidad; top to bottom Vermejo formation, Trinidad sandstone and Pierre Shale. Las Animas County, Colorado. 1909. Plate 14-A, with graphics, in U.S. Geological Survey Professional Paper 101. 1917.
    map background search result map search result map A characteristic outcrop of the Trinidad sandstone, about 4 miles north of Trinidad; top to bottom Vermejo formation, Trinidad sandstone and Pierre Shale. Las Animas County, Colorado. 1909. South wall of Purgatoire Canyon near Sopris. Las Animas County, Colorado. 1909. Mammoth Cave National Park, Kentucky. Formation at the top of Frozen Niagara. Mammoth Cave National Park, Kentucky. 1925. Mammoth Cave National Park, Kentucky. Formation at the top of Frozen Niagara. Mammoth Cave National Park, Kentucky. 1925. A characteristic outcrop of the Trinidad sandstone, about 4 miles north of Trinidad; top to bottom Vermejo formation, Trinidad sandstone and Pierre Shale. Las Animas County, Colorado. 1909. South wall of Purgatoire Canyon near Sopris. Las Animas County, Colorado. 1909.