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FIGURE 2.5 West to east profile through Porcupine Cave. The profile runs from the entrance adit on the left side of figure 2.3 through the Memorial Day Room on the right side of figure 2.3.

FIGURE 2.6 Detailed profiles through cross sections depicted in figure 2.3: A-A', D-D', and F-F'.

ments of these fossils must take into account the spatial and temporal provenance of the different localities. In fact, Porcupine Cave is not "a locality" in the Rocky Mountains; it is a cave that contains multiple, closely spaced, but temporally distinct localities.

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