Figure F1. A. Central America convergent margin, locations of Legs 170 and 205, and isochrons derived from seafloor magnetic anomalies. Numbers indicate crustal age in millions of years. Tectonic boundaries, convergence direction and rate (arrow), and arc volcanoes (triangles) are also shown. FS = Fisher Seamount, QSC = Quesada Sharp Contortion. B. Bathymetric map of Legs 170 and 205 with detailed locations of each site. C. Migrated multichannel seismic Cross-section BGR-99-44 showing Sites 1039, 1040, and 1043 (thin lines) and Sites 1253, 1254, and 1255 (thick lines). CMP = common midpoint. D. Lithology of sediments recovered from Sites 1040 and 1043 in the wedge. Lithology at Sites 495 and 1039 in the incoming plate is also shown for comparison.

Figure F1. A. Central America convergent margin, locations of Legs 170 and 205, and isochrons derived from seafloor magnetic anomalies. Numbers indicate crustal age in millions of years. Tectonic boundaries, convergence direction and rate (arrow), and arc volcanoes (triangles) are also shown. FS = Fisher Seamount, QSC = Quesada Sharp Contortion. B. Bathymetric map of Legs 170 and 205 with detailed locations of each site. C. Migrated multichannel seismic Cross-section BGR-99-44 showing Sites 1039, 1040, and 1043 (thin lines) and Sites 1253, 1254, and 1255 (thick lines). CMP = common midpoint. D. Lithology of sediments recovered from Sites 1040 and 1043 in the wedge. Lithology at Sites 495 and 1039 in the incoming plate is also shown for comparison.