Testing the annual nature of speleothem

Th datingtechniques with 2s precision as good as 60.5 yr on a laminated stalagmite with density couplets fromXianrenCave,China, that covers the last 300years. We findthatthe layers donot alwaysdeposit annually.Annual bandscanbe under-or over-countedby severalyears duringdifferentmulti-decadal intervals. Theirregular formation of missing and false bands in this example indicates that the assumption of annualspeleothem laminae in a climate reconstruction should be approached carefully without a robustabsolute-dated chronology.

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