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Abstract: Analysis of a deep-sea mass-transport deposit exposed as a nearly 1.6 km continuous outcrop reveals heterogeneous internal structures and existence of a compressional stress field during transportation and deposition. Deposit of gravelly mudstone, containing large deformed sedimentary blocks (long axis from tens of centimeters up to 100 m), occurs in the Upper Cretaceous (Maastrichtian) to Paleocene Akkeshi Formation, Hokkaido Island, northern Japan. The outcrop was photographed and sketched, and clast sizes were measured to study quantitatively the internal structure of this mass-transport deposit. The size distribution of sedimentary blocks exhibits a power-law distribution, but mean size and concentration...

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