Abstract.We

No abstract

We examined multichannel seismic records CDP-1, CDP-2, CDP-3, 1017, and records obtained during the site survey for Leg 112 to evaluate stratigraphy, tectonic evolution, and the structural character of the active margin offshore of Peru.From the reprocessed records we learned that the regionally uniform structure of the margin between 4°S and 14°S is modified by local tectonism. Common elements are crust of continental affinity beneath the middle and upper slope and an accretionary complex below the lower slope. The forearc basins have a varied tectonic history, which led to considerable differences in subsidence history and deformational style. Compressional tectonics dominate the front of the margin, whereas extension accounts for deformation landward of the midslope area.

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A Cca and Ck horizon of an Orthic Regosol in Alberta were investigated using r3C/r2C and tto/tuo isotope ratios, X-ray diffraction and the scanning electron microscope as a possible basi, f-diff"r.ntiutin! pedogenic and lithogenic "tt!911t:^T1T:als' These results *uy t uu" u piuctical application in the use ofca and k suffixes in horizon designation.