Zebrowski Claude auteur aut IRD text conferencePaper spa text/pdf reformatted digital access Indurated volcanic soils are located in the North of the interandean basin. Soils are distributed according to a climatic toposequence. The indurated horizons (cangahua) are located in paleosoils. Their hardness is very high in dry areas, at the bottom of the soil sequence, and lower in high altitude areas which are more hunid. The soils with cangahua at less than 20 cm depth cover about 80,000 hectares. (Résumé d'auteur). specialized VOLCANISME CLIMAT TOPOSEQUENCE SOL INDURATION CARACTERISTIQUE CHIMIQUE CARACTERISTIQUE PHYSIQUE PYROCLASTITE PALEOSOL UNITE DE PAYSAGE CANGAHUA EQUATEUR ANDES 068CLASOL Suelos Volcanicos Endurecidos, 3., Quito (ECU), 1996/12/9-14 128-137 Zebrowski Claude ed. edt IRD Quantin Paul ed. edt IRD Trujillo G. ed. edt IRD Villamar M.D. collab. clb IRD Quito (ECU) UE Quito (ECU) ORSTOM Quito (ECU) PUCE Quito UCE 1997 https://www.documentation.ird.fr/hor/fdi:010012918 [F A010012910] https://www.documentation.ird.fr/hor/fdi:010012918 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/divers2/010012918.pdf IRD - Base Horizon / Pleins textes 1998-03-03 2013-07-31 fdi:010012918 fre