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<br />32 Sedimentology and Stratigraphy of the Palisades, Lower Comanche, and Arroyo Grande MrRis of the Colorado River
<br />
<br />cidate the timing of human occupation at this site (if grass fires
<br />were indeed deliberately set). issues discussed by Fairley (2003)
<br />as relevant to understanding human interaction with the prehis-
<br />toric Grand Canyon landscape.
<br />As Fairley (2003) has stated, cultural resource manage-
<br />ment in Grand Canyon National Park could benefit from mOTC
<br />detailed quantification of erosion of archaeulogically significant
<br />sediment deposits. Resolution of dam-induced erosional etfects,
<br />a key component of both geomorphic and cultural-resource
<br />investigations, could be greatly facilitated if quantitative records
<br />of erosion rates were available from the predam time, but such
<br />data are not available, nor arc erosion rates systematically quan-
<br />tified on a regional scale during geomorphic or archaeological
<br />monitoring work today. Erosion rates and processes could be
<br />definitively established Ihrough the more widespread use of
<br />repeated 11igh-resolution survey mapping (,,,,,'hich has been done
<br />at a number of locations by NPS and other research groups,
<br />as exemplified by Yearts, 1996), the use oflong-tenn camera
<br />placement, and the continued lIse of inslrument stations to mea-
<br />sure precipitation, wind magnitude and intensity, and aeolian
<br />sediment-lranspon rates. The Thompson and Potochnik (2000)
<br />restorative base-level hypothesis, and their predictive model for
<br />terrace erosion. could be tested systematically in represenlative
<br />river- and terrace-based drainage systems using similar melh-
<br />ods. TIle strengthening or ren.ltation of the reSloralive base-level
<br />hypothesis through quantitative testing of this model could
<br />generate significant progress in fonnulation of management
<br />strategies for the river corridor, given the implications of this
<br />model for reltlling geomorphic processes and archaeological site
<br />preservation to dam operations.
<br />
<br />Acknowledgements
<br />
<br />This projecl has been sponsored by the U.S. Geological
<br />Survey and Bureau of Reclamation through the Grand Canyon
<br />Monitoring and Research Center (GCM RC). PennisslOn to
<br />conduct the research was granted by Grand Canyon National
<br />_ Park under Research and Collecting Pennit GRCA-2003-SCI-
<br />0101. We are grateful to'Lorerta Jackson, Hualapai Tribal His- -
<br />torie Preservation Officer, for authorizing the work to occur at
<br />Arroyo Grande. We thank boatmen Briall Dierker. Steve Jones,
<br />and Kirk Burnert for Iheir valuable logistical support during
<br />river Irips in May 2003 and May 2004. and Carol Fritzinger
<br />ofGCMRC for coordinating those trips. Jan Balsom. Chief of
<br />Cultural Resources at Grand Canyon National Park, has been
<br />instnullental in the developmcnt and planning of this research.
<br />Michelle Rubin provided field assistance during the 2003 and
<br />2004 river trips. Mike Dai and Tom Porter of the Arizona Water
<br />Resources District assisted with surveying opcrations and logis-
<br />tics at Arroyo Grande. Nancy Andrews ofNPS contributed to
<br />the data preparation for monitoring work at archaeological sites.
<br />Erin Todd analyzed a sample of the Lower Comanche white
<br />layer under a petrographic microscope. This work has benefited
<br />from insightful discussion ilnd comments by Tcd Melis, Mary
<br />Barger, Loretta Jackson, and Richard Hereford. We thank Curt
<br />
<br />Storlazzi and Jon Warrick tor ~eir technical reviews of this
<br />manuscript, and Peter Stauffer for thorough editorial reviews
<br />and revision.
<br />
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