Clast-supported polymictic lapilli-tuff, Unit VI. High-angle reverse faults, Hole U1437E Unit VI. Monomictic white to light gray evolved lapilli-tuff, Unit V. Brown tuff with tuffaceous mudstone, Unit V. Lapilli-tuff and lapillistone, Hole U1437E Unit V. Characteristic microscopic features of alteration, Hole U1437D Unit IV. Typical dark gray crystal-rich tuff, Unit IV. Fine-grained light green tuff lithofacies, Unit IV. Plagioclase-phyric andesite clast, Unit IV. Lapillistone and lapilli-tuff, Hole U1437D. Tuff and clast-supported polymictic lapilli-tuff lithofacies. Distinction between tuff and clast-supported polymictic lapilli-tuff. Cavity filled with prehnite aggregate in an evolved tuff, Unit III. Clay replacing vitric matrix in an evolved tuff, Unit III. Matrix-supported tuffaceous consolidated breccia, Hole U1437D Unit III. Matrix-supported tuffaceous consolidated breccia, Hole U1437D. Crystal-rich stratified interval, Unit III. White to gray-green evolved tuff, Unit III. Dark gray evolved tuff, Hole U1437D Unit III. White to medium-gray tuff, Hole U1437D Unit III. Tuffaceous mudstone with foraminifers, Unit III. Hornblende in an altered pumice clast, Unit II. Crystal-rich tuff and pumice-rich lapilli-tuff layers, Unit II. Hornblende and colorless glass in evolved ash, Unit I. Laminated evolved ash layers, Hole U1437B Unit I. Evolved ash grading upward into tuffaceous mud, Unit I.

Pumice lapilli dropstone, Hole U1437B Unit I. Percentage of lithofacies per core, Unit I. Evolved ash intervals intercalated with tuffaceous mud, Unit I. Tuffaceous mud intercalated with mafic ash intervals, Unit I. Tuffaceous mudstone and volcaniclastics, Hole U1437E. Summary lithostratigraphic log, Hole U1437E. Tuffaceous mud and volcaniclastics, Hole U1437D. Summary lithostratigraphic log, Hole U1437D. Tuffaceous mud and volcaniclastics, Hole U1437B. Summary lithostratigraphic log, Hole U1437B. Two main basin types recognized within arcs. Seismic lines displayed as a function of depth.

Two hypotheses for evolution of Izu arc crust. Tectonic evolution of Philippine Sea region.

Temporal and spatial variation in 40Ar/ 39Ar ages. Wide-angle seismic profile across Izu arc. Wide-angle seismic profiles showing thick middle crust.

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