. Annual report of the Regents. New York State Museum; Science. Plate 54 To face p. rl67. E. O. Eckel, photo. Poughquag quartzite, Peekskill Creek, showing slaty cleavage. 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 New York State Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer

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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience