ABSTRACTTalus slopes, especially their particle orientation, were studied in order to illustrate the variations in talus forming processes in relation to climate.An arid and a periglacial area were chosen for this study. As case studies certain desert talus slopes were investigated in parts of the Negev and Sinai deserts close to the Gulf of Aqaba and a periglacial talus cone was studied in Kärkevagge, northern Scandinavia.The studies were concentrated to measurements of such indicators of past and present talus forming geomorphic processes, as particle form, size, orientation and imbrication. While the periglacial field area includes only one type of bedrock, the other includes a larger variety of bedrock types and cone morphology.The interpretation of particle orientation and imbrication was made from plottings on Schmidt-nets showing the true dip and an orientation of the talus material.The study of the different talus cones has clearly illustrated the difference between the two contrasting environments as regards slope profile, particle shape—transport relations, particle size and orientation, all indicating a difference, between the two areas in type of process and frequency.