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Landslides were recognized on aerial photographs by a combination of such general distinctive features as (1) small isolated pondf'l, l akes, and other c l osed depressions; (2) springs;(3) abrupt and i rre gular chang..,s in slope and drainage pa t tern; (4) hWJ111ocky or irregular surfaces; (5) steep, arcuate scarps; (6) irregular soil a n d vegetation patterns; and (7) level areas within .,;tee.per s l opes. Landslid!' deposits we re differentiated lnto several types using tlw gen1cral features listed and more detailed criteria (see EXPLANATION) developed by Wright from field observations in the north ern Coast Ranges of California, particular l y in Sonoma and Ma rin Counties, over the past several years.

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