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Bl Introduction 3 Purpose of study 3 Geologic and geographic setting 3 Methods of study 4 Acknowledgments 4 Stratigraphy 4 Cretaceous and Tertiary section 4 Harebell Formation 5 Pinyon Conglomerate 5 Regional lithofacies 8 Quartzite-bearing conglomerates of other ages 8 Lithology and petrography 8 Conglomerate  8 General description 8 Size, shape, and surface markings of roundstones 9 Lithology of roundstones 10 Petrography of roundstones 12 Petrography of matrix 22 Sandstone 24 General description 24 Petrography 25 Minor lithologies 27 Page Sedimentary structures and paleocurrents B29 Imbrication 29 Description 29 Measurement and statistical analysis 29 Comparison of imbrication in conglomerates with that in modern streams 32 Paleocurrents 35 Crossbedding and ripple cross-lamination 35 Harebell and Pinyon paleocurrents 35 Upper Cretaceous and Paleocene paleocurrents compared 38 Regional variation of quartzite roundstone size 40 Synthesis of information on sediment dispersal 43 Other quartzite-bearing conglomerates 48 Beaverhead Formation 48 Fort Union Formation 50 Conclusions  56 Source of conglomerates 56 Evidence for long-distance transport... --...- 56 Objections to long-distance transport . 62 Alternative explanations.. .. --.  63 Depositional environment  64 References cited. ....  65

Sedimentary petrology and paleocurrents of the Harebell Formation, Pinyon Conglomerate, and associated coarse clastic deposits, northwestern Wyoming