The fields of study he is best known for: Paleontology Sedimentary rock Ecology Paleontology, Oceanography, Aragonite, Terrigenous sediment and Geochemistry are his primary areas of study. Paleontology is closely attributed to Cold seep in his study. In his research, Quaternary is intimately related to Glacial period, which falls under the overarching field of Oceanography. His Aragonite research incorporates themes from Bioerosion, Sediment and Diagenesis. The concepts of his Diagenesis study are interwoven with issues in Reef, Geologic record, Phanerozoic and Ordovician. Campbell S. Nelson does research in Geochemistry, focusing on Dolomite specifically.