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Figure F16. Data from Section 330-U1372A-9R-2 illustrating potential limitations of the piece-averaging technique. A. Archive-half demagnetization data (solid circles with lighter shading indicate a misfit > 3.4), discrete thermal demagnetization data (open squares), and discrete AF demagnetization data (open triangles). Average direction for entire piece (open circle) calculated from archive-half core data using Fisher statistics for individual PCA directions with misfit > 3.4. B. Vector endpoint diagrams for discrete samples and representative archive-half core intervals are shown in A. See Figure F14 caption for explanation of symbols. NRM = natural remanent magnetization.

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