Jointed Rock

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This illustration shows a jointed structure. In this drawing, there are two systems of joints or divisional planes in the same region, crossing one another, and the undermining of a bluff of jointed beds and tumbling down of masses leads to the production of forms like those of fortifications or broken walls.


James D. Dana, New Text-book of Geology (New York: Ivison, Blakeman & Company, 1883) 49


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