BIOLOGICAL HOMOGENIZATION IN FOSSIL UNDERCLAYS AND SEAT ROCKS
Unbeddedness, or homogeneity, is the main characteristic of seat rocks and underclays, interpreted as fossil soils. Study of modern soils indicates that this homogeneity is a result of biological processes. Leaching and other chemical activities are for the most part related to roots, but the actual physical homogenization is due to the fauna of the soil.