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Illuminating the Past:
Remote Sensing at
Shiloh National Military Park
by
David G. Anderson, John E. Cornelison, David Bean,
and Paul D. Welch
Between
July 12 and 25, 1999, a team from the Southeast
Archeological Center (SEAC) examined several areas at Shiloh
National Military Park in western Tennessee and at Corinth, Mississippi.
The work documented a wide array of Civil
War era military features, New Deal era archaeological excavation
trenches, and Mississippian
mound construction stages. With a ten-person team, including Florida
State University students, project directors David
G. Anderson and John E. Cornelison
used a variety of investigative techniques, including ground penetrating
radar (GPR), metal detecting, GPS and total station mapping, and test
excavations. Their objectives included:
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surveying mounds, the plaza, and Confederate graves with
GPR;
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relocating unmapped excavation units opened in 1933 and 1934
during major New Deal era excavations at the Shiloh Mound Group;
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locating the Battery Robinette earthworks at Corinth, the
location of a major Civil War battle in 1862; and
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performing a systematic metal detector survey on the battlefield
at Shiloh to evaluate two small areas of proposed park development.
GPR Survey of Indian Mounds and Confederate Graves
Over
one hundred GPR transects totaling almost three linear kilometers of output
were run at the Shiloh Mound Group. Transects were run over all seven of
the major mounds, revealing a number of internal features in each.
Extensive GPR mapping at Mound A was conducted using transects
oriented north-south and east-west
and spaced two meters apart. Well-defined signatures of stages deep within
the mound were found. This data will be invaluable in guiding future mitigation
excavations at Mound A.
Evidence for construction stages and other internal mound
features were found in most of the other mounds examined. Importantly,
the GPR output revealed
where past excavations occurred. For example, Mound C, thought to have
been completely dug away and then rebuilt, was found to be intact at the
south end.
All the major excavation trenches into the mounds left
pronounced signatures. For instance, Union burial pits had been placed
in Mound G after the battle. GPR output indicated that one soldier may
have been left behind when the burials were relocated to the nearby national
cemetery.
The GPR was also used to examine five of the Confederate
mass graves at Shiloh, providing information not only on the placement
of burials within the trenches, but on their location and depth, as well.
This information will assist park personnel in determining where the graves
are in relationship to the markers.
Relocating New Deal Era Excavation Units
Most importantly, GPR transects were run over the plaza
area around the mounds, successfully locating
signatures of literally dozens of excavation units opened by Frank Roberts
and his crews during the New Deal era. Thirty-one, one-by-one-meter units
were opened to depths between ten and thirty centimeters in order to verify
the nature of the GPR signatures. These proved highly successful in locating
trench edges, which were clearly delimited in many units.
Locating Battery Robinette at Corinth
At Corinth, Mississippi, the GPR was used to successfully
locate the earthworks for Battery Robinette,
the site of a major engagement fought in late 1862. The earthworks were
leveled after the battle, and the area converted into a municipal park.
Although the outline of the earthworks was known from historic maps, no
surface traces remained. A systematic program of metal detection, shovel
testing, and limited
test pitting in May 1999 not only located appreciable Civil War activity,
but helped investigators eliminate most areas from consideration. The first
GPR transect laid out during the July 1999 fieldwork ran right over the
top of the earthwork, the outline of which was then traced using additional
transects. Four one-by-one-meter units were opened in three areas to verify
the GPR signatures, confirming the presence of the earthwork.
Systematic Metal Detector Survey at Shiloh
Two areas slated for construction at Shiloh were also
examined using shovel testing and systematic metal
detection. The shovel testing proved negative, but the metal detecting
located over two hundred Civil War era artifacts. One area-a Union camp
occupied for a month prior to the battle-produced predominantly utilitarian
items and unfired rounds. A second area, where extensive fighting occurred,
produced large numbers of fired rounds.
All proveniences examined during the 1999 fieldwork were
mapped using a total
station and a GPS unit and then tied to a series of permanent datums. Locations
of unusual features detected by the GPR and metal detectors, and the locations
of the excavation units, are thus known to within a few centimeters, permitting
their relocation in the future.
Project Benefits
All the project objectives were met, as were several additional
goals. A report on the fieldwork will include the full output and data
from the GPR transects. All materials recovered will be curated following
NPS standards. A web site describing the fieldwork is also being developed.
Even before final reports are published, the project provided
invaluable information to the park- information that will be used to make
management decisions, plan construction projects, and interpret
the site. For instance, the precise location of the Battery Robinette site
can now be factored into plans for the construction of a major visitors
center at Corinth. So too, the data collected from the Indian Mound Group
at Shiloh will be used to help plan vital mitigation work at Mound A, which
is eroding into the Tennessee River. The information will also help other
researchers in their work, such as Dr. Paul Welch of Queens College,
New York, who is preparing an overview of past archaeological work at the
Indian Mound Group. And, most important, interpretation of the site for
park visitors will be as current and accurate as possible.
go
to Civil War Archeology web pages
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