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This feature class outlines the areal extent of relatively recent, individual slope movements. NCGS staff delineated the outlines from field investigations, and features visible in 1951 and 1982 aerial photography, and 1984, 1993, 1998, 2001 and 2007 orthophotography. Sources of information used to compile November 3-7, 1977 debris flow track into this feature class included Pomeory (1991) and Otteman (2001), augmented by the NCGS's field investigations and inspections of 1982 and 1984 aerial photographs. Outlines are shown only for slope movements generally mappable at a scale of 1:24,000 and that could be identified on aerial photography. |