41. Base Line Issues at the Sny Magill Mound Group:
Mound Disturbance and Historical Cartography.
Dial, Janis L.
A program of archeological field investigations and archival research was
begun at the Sny Magill Mound Group, Effigy Mounds National Monument, Iowa
in 1987 by the Midwest Archeological Center, National Park Service. The
study was undertaken as part of a larger Center research effort to help
develop a management strategy which will contribute to the long-term
preservation of this important site. The primary purpose of the study
reported herein was to compile a set of base line data on the extent and
present condition of the site and to identify those natural and cultural
processes which appear to have an ongoing negative impact upon it. The
latter include the displacement of mound material through animal burrowing
and tree falls, and the erosion of mounds along the eastern edge of the
site adjacent to Johnson's Slough. An historical perspective on site
disturbance was gained through an evaluation of new field data relative to
information collected during previous archeological investigations dating
back to 1885. Historic and recent maps of the Group were compared in order
to resolve basic questions about the geographical position of the mounds.
Finally, a number of additional mound-like features were recorded between
the known mounds.
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