. Annual report. New York State Museum; Science; Science. 120 NEW YORK STATE MUSEUM The cracks which ramify everywhere through the lava are, for the most part, solidly filled with secondary calcite. The amygdules are chiefly of this mineral also. Woodworth described coarser grained rock, containing feldspar crystals visible to the eye, from the south end of the knob, and the correctness of the description was verified by Cushing's study of the thin section. But we have been unable to find any rock of this type in our later work. Some rock has been removed from the south end though the original
. Annual report. New York State Museum; Science; Science. 120 NEW YORK STATE MUSEUM The cracks which ramify everywhere through the lava are, for the most part, solidly filled with secondary calcite. The amygdules are chiefly of this mineral also. Woodworth described coarser grained rock, containing feldspar crystals visible to the eye, from the south end of the knob, and the correctness of the description was verified by Cushing's study of the thin section. But we have been unable to find any rock of this type in our later work. Some rock has been removed from the south end though the original thickness was but slight. None of this coarser material remains and we are left in entire uncer- tainty as to its original Fig. II Natural size drawing of a hand specimen of corroded limestone in pitchstone The inclusions. Inclusions abound throughout the plug, both in the lava balls and in the intervening material. They are all of lime- stone, and limestone of but a single type. Though the knob stands surrounded by black shales, there are no shale inclusions in it. It is possible that there may be inclusions of earlier trap, and the coarser grained rock just mentioned may be an inclusion. But on this point we have no certain evidence. The inclusions are of pure limestone, effervescing briskly and immediately with acid. They range in size up to masses a foot. 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. Albany : University of the State of New York
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