. Bulletin of the Geological Society of America. Geology. BULL. GEOL. SOC. AM. VOL. 25, 1913, PL. 3. LIMESTONE BOULDERS These seven boulders (slightly reduced) were flattened and etched by the solvent action of meteoric water. Number 1 is very slightly affected. Numbers 2, 3, 4, 5, and 6 are arranged to exhibit successive stages of flattening. Number 6 is nowhere more than three-sixteenths of an inch in thickness. A transverse radial section of the upper right-hand margin of this speci- men would show a slightly cuspidate extension. This and number 5 both have etched furrows following straight
. Bulletin of the Geological Society of America. Geology. BULL. GEOL. SOC. AM. VOL. 25, 1913, PL. 3. LIMESTONE BOULDERS These seven boulders (slightly reduced) were flattened and etched by the solvent action of meteoric water. Number 1 is very slightly affected. Numbers 2, 3, 4, 5, and 6 are arranged to exhibit successive stages of flattening. Number 6 is nowhere more than three-sixteenths of an inch in thickness. A transverse radial section of the upper right-hand margin of this speci- men would show a slightly cuspidate extension. This and number 5 both have etched furrows following straight joint planes. Number 7 is a part of a boulder, from which more than one- half has been etched away on one side, while the segment in the photograph, shown edgewise, was preserved almost intact because it was securely lodged in a protecting 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
