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_ Introduction  _ Stratigraphy and paleontology, by W. A. Cobban  _ Niobrara Formation  _ Fossils reported  _ Fossils at base of Niobrara Formation  _ Systematic descriptions  __ --Age  _ Petrology and origin of nodules, by Harry A. Tourtelot _ General statement on phosphate nodules  _ History of study of phosphate nodules  _ Summary description of phosphate nodules ____ _ Nodules at base of Niobrara Formation  _ Regional setting  -__ Occurrence of nodules near Fairburn  _ Morphology of nodules  _ Petrography and mineralogy  _ Preexisting materiaL  -Nodules  _ Secondary minerals  ----Pyrite  Page

Stratigraphic significance and petrology of phosphate nodules at base of Niobrara Formation, east flank of Black Hills, South Dakota