 They found the Laacher See 14C dataset to be consistent with expectations of synchroneity.They found the Younger Dryas boundary layer 14C dataset to be inconsistent with the expectations for its synchroneity, and the synchronous global deposition of the hypothesized Younger Dryas boundary layer to be extremely unlikely.Proponents of the hypothesis have responded to defend their findings, disputing the accusation of irreproducibility or replicating their findings.