<i>Reply</i> detection of a 27.5-My cycle in extinctions of non-marine tetrapods in light of a similar cycle in marine extinctions and coordinated geologic events

Our circular-spectral and Fourier analyses of the ages of the 10 recognized non-marine tetrapod extinction events over the last 300 My revealed a significant spectral peak at 27.5 My. Omerbashich, using his GaussVanicek method of spectral analysis, fails to find a significant 27.5 My cycle in the same data. He claims to find predominant short (< 1 My) Earth precession cycles in the data set, where the smallest interval between extinction events is 8 My. In response to Omerbashich, we performed a new analysis of non-marine extinctions using a best-fit method that again displays the high spectral peak at similar to 27.5 My.