pa·le·o·pe·do·lo·gy 
(pā′lē-ō-pĭ-dŏlə-jē, -pĕ-)
(pā′lē-ō-pĭ-dŏlə-jē, -pĕ-)n.
The study of geologically old and generally fossilized soils, especially to obtain information about the history of environmental and biological conditions on Earth.
pa′le·o·pe·do·logi·cal (-də-lŏjĭ-kəl) adj.