. Bulletin of the Geological Society of America. Geology. BULL. GEOL. SOC. AM. VOL. 14, 1902, PL. 52. Figure 1.—Concretion Horizon in thf. Laramie. 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