. Bulletin of the Geological Society of America. Geology. BULL. GEOL. SOC. AM. VOL. 25, 1913, PL. 4. PHOTO. BY D. D. CAIRNBS ;ANADIAN GEO LOGIC At SURVEY Figure 1.—Looking down Porcupine River from International Boundary Line All the rock exposures in the ramparts here belong to the Tindir group. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890