section of the Mata Amarilla Formation, there are vertic Alfisols. In these Alfisols, there is a preservation of fossil forests, whose minimum age is 337 years. The fossil forests in this section are made up of in situ trunks. These trunks, in life position, have shallow root systems with well-developed horizontal roots, and have minimal development of vertical roots. A log of Podocarpxylon gargiae roots was found in the formation as well. The total mean diameter of these trees in the vertic Alfisol paleosol is greater than 60 cm and the smallest tree diameter is 26 cm. While Afisol paleosols are known for their woodland soils and fossils, there have also been other types of fossils found. The ichnofacies of the ground-nesting bees, Celliforma, was formed in well drained Alfisols as well as Aridisols and Oxisols. The Termitichnus ichnofacies, which included a large array of termite nests and pellets, is found in Oligocene Alfisols, Aridisols, and Oxisols. All the tetrapod bones and tracks from the paleosol sequences of Late Devonian and Mississippian of New York and Pennsylvania, U.S.A. are found in Aridisols and Alfisols. The Alfisols in the Texas High Plains have evidence for fossilized pollen and beetles. See also Paleosol Paleopedology Pedogenesis Pedology (soil study) Soil classification Soil science Soil type References External links Pedology Types of soil