The following figure, "Generalized Rock Column of the Grand Canyon," comes from a University of New Mexico geologic history project done in conjunction with with Grand Canyon National Park, the "Trail of Time" exhibit, at the Web site The following two paragraphs and geologic column (Table 3:) comes from a geology 101 online assignment at the University of North Dakota, at Please use the example at the bottom of this page to cite the Purdue OWL in MLA.
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