The earliest map of Porcupine Cave was published by Parris (1973). During the course of exploration for fossils, new passageways were discovered in the late 1980s and 1990s, and accordingly renewed mapping efforts were undertaken by members of the Colorado Grotto and Front Range Grotto of the National Speleological Society. The updated map produced for this book (figure 2.3) was surveyed and drafted by teams led by Hazel Barton, Kirk Branson, and Don Rasmussen, and it shows the location of the major fossil localities discovered as of 2000 that are mentioned in this book. In some cases different institutions excavated at the same locality and each institution assigned its own locality number. Table 2.1 presents the resulting synonymies (i.e., the same locality represented by two or more different numbers), keys the names of the various localities to figure 2.3, and summarizes the geological age interpreted for each locality.
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