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Lateral moraine age in Park Valley, Tararua Range, New Zealand

Abstract Recent geomorphologie and sedimentologic investigations in Park Valley, in the central Tararua Range, have identified several landforms of glacial erosion and deposition, including cirque basins, a U‐shaped glacial valley, and a lateral moraine ridge. The presence of Kawakawa tephra (Aokautere Ash) within loess c. 50 cm beneath the surface of the moraine has indicated that the moraine was formed prior to 27 ka, suggesting late MIS 3 glaciation in this sector of New Zealand. However, recently published 10Be cos‐mogenic dates from glacially‐scoured bedrock and an erratic block on the surface of the moraine indicate that glaciation was much later, the corollary being that the Kawakawa tephra has been re‐distributed post‐eruption, perhaps from the ridgelines surrounding the moraine. Here, two optically‐stimulated luminescence ages on the loess are reported that suggests most of the moraine was formed during late MIS 3 or early MIS 2, and that a readvance at c. 17.7–18.7 ka extended as far as the moraine.