A rock labyrinth, a regular arrangement of large, joint-bounded chert blocks, separated by streets up to 15 m wide occurs on a dip slope of Upper Palaeozoic rocks in the Front Ranges of the Rocky Mountains, adjacent to the Red Deer River in Alberta. It is believed to be caused by the development of ice wedges under earlier, periglacial conditions and to have been disturbed by later creep along weak units in the sedimentary succession. Labyrinth development may be a typical response of gentle dip slopes in cohesive rock units to periglacial conditions, particularly if systematic jointing exists perpendicular to the slope.

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