protalus
/prəʊˈteɪləs/Physical Geography
noun
A rocky ridge or lobe marking the lower edge of an existing or melted snow bank, composed of frost-fractured boulders and other coarse debris that have slid or rolled over the snow from a talus or scree higher up the slope, or been transported by solifluction from the talus. Chiefly attributive, especially in protalus rampart.
Origin
1930s. From pro- + talus.