From two samples, one from sandstone and one from mudstone, from a graded bed in Upper Miocene turbidites at Cleland Creek all the specimens of two species of Foraminifera were measured. Small specimens predominate in the mudstone and large specimens in the sandstone. The maximum size is about the same in both sandstone and mudstone, but the minimum size is much smaller in the mudstone. The size-frequency distributions appear to be nearly typical for sandstones and mudstones of turbidites.