The infilling sandstone is derived from the fossil soil over which the root was growing.

Other fossil soils occur in areas where volcanic activity has covered the ancient soils.

Present-day weathering has resulted in new profiles being developed on these much older fossil soil profiles.

Sedimentary clays that occur as the seatearths, or fossil soils, which underlie almost all coal seams.

There are numerous flows recorded which may have been erupted irregularly as fossil soil (Paleosol)profiles and lacustrine type rock units are occasionally found within the rock unit.

The Lower Purbeck consists of fresh-water and terrestrial deposits, marls, and limestones (the famous Portland limestone) with several fossil soils known as dirt beds.

The isotopic composition of fossil soils of end Triassic and Early Jurassic has been tied to a large negative carbon isotope excursion (Whiteside et al. 2010).

The kinds of horizons in fossil soils are, though, generally the same as those found in present-day soils, allowing easy classification in modern taxonomy of all but the oldest soils.

Geologists have recognized innumerable fossil soils (paleosols) throughout the strata containing upright fossils at Joggins, Nova Scotia, Yellowstone petrified forests, coal mines of the Black Warrior Basin of Alabama, and many other locations.

The loess, loess-derived sediments and the many intercalating fossil soils overlying the "Rocourt soil complex" and the "Warneton soil complex" belong to the Weichselian s.s. and represent the terrestrial equivalent of MIS 4, 3 and 2.

With the exception of some exceedingly old soils which have a clayey, grey-green horizon that is quite unlike any present soil and clearly formed in the absence of O, most fossil soils can be classified into one of the twelve orders recognised by this system.