Compilations of abundances of Strontium and Barium in extremely metal-poor stars show that an apparent cutoff is observed for [ Sr/Ba ] at [ Fe/H ] < -3.6 and large fluctuations for [ Fe/H ] > -3.6 with a clear upper bound depending on metallicity .
We study the factors that place upper limits on the logarithmic ratio [ Sr/Ba ] .
A model is developed in which the collapses of type II supernovae are found to reproduce many of the features seen in the data .
This model is consistent with galactic chemical evolution constraints of light-element enrichment in metal-poor stars .
Effects of turbulence in an explosive site have also been simulated , and are found to be important in explaining the large scatter observed in the [ Sr/Ba ] data .