Abstract
Abstract Dates of 22800 ½ 800 yr B.P. (new T½), 22200 ½ 750yrB.p. (old T½) (NZ 3940) and 19750 ½ 600 yr B.P. (new T½), 19200 ½ 550yrB.p. (old T½) (NZ 4298) have been obtained for plant remains in lake deposits in the Lyndon-Acheron Valley, which links the Rakaia and Waimakariri drainage systems. The deposits occur in a channel cut into outwash gravel of Bayfield 2 age, and preceding a period of aggradation related to a third and previously unrecognised Bayfield advance. The dates thus provide a base for establishing a firmer correlation between deposits on the east and west sides of the Southern Alps than has been available previously. The plant remains indicate the absence of woody vegetation and the presence of a sparse herbaceous vegetation. However, there are indications that the climate was less cold than might have been suspected from other evidence.
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