Page 181 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed

160 Maritime Archaeology: A Technical Handbook, Second Edition
Figure 5.1 Operator using nonferrous diving equipment to conduct a close-plot magnetometer survey on the Kyrenia wreck site. See Figure 5.2. (Courtesy of Kyrenia Wreck Excavation.)
sity contour diagram. This showed two sharp magnetic anomalies, which were thought to be due partially to the amphora cargo and partially to pos- sible buried ferrous material (Figure 5.2). This same method has been used on the Cape Andreas tile wreck (Green, 1971, 1973), the Amsterdam survey (Marsden, 1974; Figure 5.3), and at Padre Island, TX where a computer- drawn close-plot magnetometer survey was carried out (Arnold, 1981).
There are many tricks of the trade in working magnetometer surveys. In anticipating a close-plot survey, one should seriously consider obtaining advice about making the survey and the interpretation of these data. It is essential that proper reference points are set up to ensure that the diurnal variation can be monitored properly and that, if the survey proceeds over a number of days, each day’s survey can be linked to previous work.
II. METAL DETECTOR SURVEY
At the time of the Kyrenia survey, it was proposed that a metal detector survey should be conducted over the same area as the magnetometer survey