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Geophysical Surveys are
by far the fastest,
and most accurate method
for the assessment of archaeological potential of any area.
Resistivity relies
on variations in the electrical conductivity of the soil and subsoil
which in general is related to soil moisture levels. As such results can
be seasonally dependent. Slower than magnetometry, this technique is
best suited to locating positive features such as BURIED
WALLS that give rise to high resistance anomalies.
Magnetometry relies
on variations in soil magnetic susceptibility, and magnetic remanence,
which often results from past human activity. Using a FLUXGATE
GRADIOMETER these variations can be mapped or a rapid evaluation
of potential can be made by scanning.
Tomen-y-Mur Roman Fort and Medieval Castle
Variations in soil Magnetic
Susceptibility occur naturally, but can be
greatly enhanced by human activity. The technique is best suited to
looking at GENERAL CHANGES
rather than
specific features and as such is particularly useful for targeting areas
of potential archaeological significance when large sites need to be
investigated. Very large areas can be rapidly evaluated and specific
areas identified for detailed survey by magnetometer.
 
Duxford, Cambridgshire. Roman
Marching
Camp
Meon Hill, Hampshire Iron Age enclosure
Contact
Dr. I. P. Brooks or Ms. K. Laws
Engineering Archaeological Services Ltd
Unit 2, Glanypwll Enterprise Workshops
Ffordd Tanygrisiau, Blaenau Ffestiniog
Gwynedd. LL41 3NW
Tel: +44 (0) 1766 832 088
Fax:+44 (0) 1766 830 061
EMail: easltd@smsinternet.co.uk
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