mean (p = 0.41, ANOVA; p = 0.28, Wilcoxon–Mann–Whitney Rank
Sum Test) of δ18O values of acid-etched and unetched incisors. We do,
however, find a significant difference in the variance (p = 0.003, F test
for equal variance) in δ18O values of acid-etched and unetched incisors.
The similarities in isotopic values between the etched and unetched
specimens further support the assertion that all of the EFT B. suillus incisors
analyzed here originated from the same fossil population.