Type of survey: Ground penetrating radar; Instrument: Geophysical Survey Systems, Inc., SIR-System 3 Prospection depth: About 3 m; Antenna frequency: 300 MHz; Sampling interval: 1 m transects; Area surveyed: 20 x 26 m; Date of survey: 11/96.
Comments: The 20 meter long profiles show possible
fortification ditches from the Revolutionary War battle, or
subsequent modifications made by the British. Two
features about a meter deep are indicated that continue in
adjacent transects over a span of at least 26 m. The interior of
the fortification would have been to the right in the first
figure, which illustrates 6 of the transects.
Type of survey: Resistivity; Instrument: Geoscan Research RM-15; Prospection depth: 1 m; Sampling interval: 0.5 x 0.5 m; Area surveyed: 2000 m2 Date of survey: 11/97 and 5/98.
Comments: The first resistivity plan shows clear indications of several
linear subsurface features seen in the GPR profiles. They quite possibly represent
fortifications from the Revolutionary War battle or subsequent modifications
by the British. These results correspond closely with the 6 ground penetrating
radar transects shown above. The interior of the fortification would have been
to the right. The second figure incorporates later work that illustrates a myriad
of features including historic 19th century diagonal walkways, trenches from
the park's sprinkler system, the historic fortifications, and linear features
that may represent historic pathways. The circular feature that surrounds the
current monument, of which a portion corresponds to the GPR evidence, is an
intriguing outcome that warrants further investigation.
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(updated: 2/02)