Note: Project Gutenberg also has an HTML version of this file which includes the original illustrations. See 48126-h.htm or 48126-h.zip: (https://www.gutenberg.org/cache/epub/48126/pg48126-images.html) or (https://www.gutenberg.org/files/48126/48126-h.zip) [Illustration: THE GRAND CANYON—1. SCHISTS AND GRANITES (ARCHEAN ERA): 2. SANDSTONES, LIMESTONES, SHALES (ALGONKIAN ERA): 3. TONTO FORMATIONS (CAMBRIAN PERIOD): 4. REDWALL LIMESTONE (MISSISSIPPIAN PERIOD): 5. SUPAI SANDSTONE AND SHALE (PERMIAN PERIOD): 6. HERMIT SHALE (PERMIAN PERIOD): 7. COCONINO SANDSTONE (PERMIAN PERIOD): 8. TOROWEAP AND KAIBAB FORMATIONS (PERMIAN PERIOD). …
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