CONTENTS 



Page 



Importance and Distribution of the Badlands 19 



History of Exploration 23 



Classification and Correlation of the Deposits 31 



Nature of the Deposits 36 



Oligocene 38 



The Chadron Formation 38 



The Brule Formation 38 



The Oreodon Beds 40 



The Protoceras Beds 42 



Lower Miocene 42 



The Arikaree Formation 42 



The Monroe Creek Beds 44 



The Harrison Beds 44 



The Rosebud Beds 45 



Middle Miocene 47 



The Sheep Creek Beds 47 



Upper Miocene 47 



The Nebraska Beds 47 



Pliocene 47 



Manner of Deposition 49 



Geologic History 50 



Physiographic Development 51 



Concretions, Sand crystals, Dikes, Veins and Geodes .... 56 



Devils Corkscrews (Daemonelix) 59 



Economic Mineral Products 61 



Fossils 64 



Extinction, Evolution and Distribution of Animals 65 



Collecting and Mounting of Fossil Bones 70 



Classification and Naming of Extinct Animals 72 



Carnivores 77 



Creodonta 78 



Canidae 78 



Felidae 83 



Mustelidae 87 



Insectivores 88 



Rodents 88 



