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General discussion and development of classification systems
2 other sections not shown
aggregate mount andesite apatite Approximate mineralogical composition Bear Lake County Beaverhead County calcite carbonate chert chert pellets collo collophane dispersion collophane occurred collophane pellets compacted ovules cryptocrystalline Cumulative Curves Curves of Pellet diameters in aggregate diameters in thin dispersed pellets dolomite encased pellets feet thick Feldspar Field Description fluorapatite francolite gangue aggregates gangue occurred gangue-particle grade high-grade hydroxylapatite interstitial collophane light gray limonite loosely semidispersed matrix Maximum pellet diameters medium member of Phosphoria microns microns FIGURE mineral Muscovite-sericite and clay nonfriable occurred interstitially oolites Organic matter particle diameters Pellet and Gangue percent compacted percent dispersed textures percent semidispersed Petrographic Petrographic Description phane phosphate rock phosphatized fossil fragments Phosphoria formation phosphorite Plane Light quartz grains quartzitic quartzitic phosphorite ratios sample was composed sand-sized quartz semidispersed pellets sericite and clay shale shallowly sutured spherulites textural types Tourmaline veinlets vugs Wavellite Weight-percent Collophane western phosphate