Fuller investigation of the blockstreams of the Toolong Range has substantiated previous interpretation of them as part of a periglacial morphogenetic system of Upper Pleistocene age. Periglacial solifluction of blocks in a fine matrix appears to have been less important than movement with interstitial ice as matrix. This makes them akin to rock glaciers, though their meagre thickness must have prevented them moving in identical manner.Wood of Nothofagus cf. cunning hamii in quartz gravel beneath the head of one of the blockstreams was dated by C-14 to 33,000 B.C., yet it was accompanied by a pollen spectrum at least partially Tertiary in origin through reworking of presumed sub-basaltic sediments. The wood from a tree stool in situ relates to warmer conditions just prior to the periglacial phase.The basaltic regolith in the blockstreams and accompanying solifluction mantle implies a scarp retreat of about 33 m. since 33,000 b.c
The impact of Pleistocene glaciation on the Grey Mare Range is described from observations made during a brief ground survey. The conclusion reached is that the Grey Mare Range, contrary to previous opinions, escaped almost entirely the glaciation which left its clear mark in the mountains on the Main Range. The possibility of two small cirque glaciers is all that can be drawn from the evidence obtained.
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