Talus Fabric, Clast Morphology, and Botanical Indicators of Slope Processes on the Chaos Crags (California Cascades), U.S.A
Document generated on 09/27/2021 5:20 a.m. Géographie physique et Quaternaire Talus fabric, clast morphology, and botanical Indicators of Slope Processes on the Chaos Crags (California Cascades), U.S.A. Relevés botaniques, granulométrie, forme et organisation des débris sur les talus d'éboulis en tant qu'indicateurs des processus dans les Chaos Crags (monts Cascades, Californie, U.S.A.). Morfología y orientación de derrubios clásticos, e indicadores botánicos de procesos de pendiente en Chaos Crags (Cascades, California) Francisco L. Pérez Volume 52, Number 1, 1998 Article abstract The Chaos Crags, a group of dacite domes in the Cascades Mtns (California), URI: https://id.erudit.org/iderudit/004861ar were affected by volcanic debris avalanches ca. 1675 A.D.; these left a sizable DOI: https://doi.org/10.7202/004861ar deposit and a scar on the north mountain flank, now covered by talus. This report examines the fabric and morphology of talus debris, their spatial See table of contents variation, and the geomorphic processes presently affecting the slope. The talus presents a bi-segmented profile with a steep upper rectilinear segment and a shorter concave, basal zone. Debris are sorted by size both along (larger Publisher(s) clasts downslope) and across the talus (larger particles below the cliffs). Shape sorting is weaker, but clast sphericity increases, and elongation decreases, Les Presses de l'Université de Montréal toward the footslope. Upper-talus fabrics (long axes parallel to talus plane and slope) show that clasts there move by sliding, while basal blocks are deposited ISSN by rockfall, which causes more iso- tropic fabrics.
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