Tilted Strata

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This illustration shows a rock formation that has a tilted strata. a b c d represents a square block of wood, having a graduated arc b c and a plummet hung below a. Placed on the sloping surface A B, the position of the plummet gives the angle of dip.


James D. Dana, New Text-book of Geology (New York: Ivison, Blakeman & Company, 1883) 53


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