Figure F5. A. Details of isochrons inferred from magnetic anomalies near Site 1256. Shading shows normal magnetic polarity, based on digitized reversal boundaries (small circles; after Wilson, 1996). Bold line shows location of Guatemala Basin (GUATB) multichannel seismic tracklines from site survey Cruise EW9903 conducted March–April 1999 (Wilson et al., 2003). Anomaly ages: 5A = ~12 Ma, 5B = 15 Ma, and 5D = ~17 Ma. B. Bathymetry and site survey track map for Site 1256 (proposed Site GUATB-03C). Abyssal hill relief of up to 100 m is apparent in the southwest part of the area; relief to the northeast is lower and less organized. Line numbers 21–28 identify multichannel seismic (MCS) lines from the site survey. OBH = ocean-bottom hydrophone.
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