Above: This image shows a small portion of the
magnetic survey results from this extensive site. The magnetic
survey revealed a number of discrete clusters of anomalies such
as the one above.
The relatively high amplitude anomalies (appearing
in color) are thought to be associated with Late Archaic hearths.
In several cases, hearth features were exposed on the surface,
providing immediate verification of the origins of anomalies.
A number of smaller, low-amplitude positive anomalies
(appearing as black) can be seen in rough clusters. These may
be caused by induced-field phenomena associated with features
such as storage pits or postmolds.
Around the most northerly of the suspected hearths
there appears a very faint oval about 8m in diameter. This may
be caused by an architectural feature - perhaps a lodge or tent
- which had a hearth in its center. Another less distinct 'ring'
may appear around the suspected hearth at N25/E22
Because this site was magnetically very quiet,
it was possible to detect very subtle anomalies thought to be
of cultural origin. However, because the standard deviation
was close to the noise level of the instrument (as little as
0.16nT) special processing was necessary to reduce the effect
of instrument and operator induced errors, including despike
filter in the x (down the transect) direction (to reduce the
effects of instrument noise), and a periodic defect filter (to
remove the effects of the operators step while walking the transect).
Processing also included zero mean traverse, (sinX/X) interpolation
and uniformly weighted lowpass filters.
