. Annals of the New York Academy of Sciences. Science. 188 IRVING. Rhyolite family. 5. Quartz-porphyry 275 Andesite family. 6. Mica-diorite-porphyry 281 Dacite family. 7. Dacite 284 Diorite family. 8. Tonalite 286 Basalt family. 9. Augite vogesite 287 Of pre-Cambrian age. 10. Amphibolites 288 B. Theoretical discussion 289 V. ORE-BODIES 294 A. Algonkian 295 B. Cambrian 296 C. Carboniferous 311 D. Placers 314 E. Acknowledgments 315 I. INTRODUCTION. The Black Hills of South Dakota, as has been so well set forth by Newton in his classic work on the region and by many subsequent writers, constitute
. Annals of the New York Academy of Sciences. Science. 188 IRVING. Rhyolite family. 5. Quartz-porphyry 275 Andesite family. 6. Mica-diorite-porphyry 281 Dacite family. 7. Dacite 284 Diorite family. 8. Tonalite 286 Basalt family. 9. Augite vogesite 287 Of pre-Cambrian age. 10. Amphibolites 288 B. Theoretical discussion 289 V. ORE-BODIES 294 A. Algonkian 295 B. Cambrian 296 C. Carboniferous 311 D. Placers 314 E. Acknowledgments 315 I. INTRODUCTION. The Black Hills of South Dakota, as has been so well set forth by Newton in his classic work on the region and by many subsequent writers, constitute an elevated area, roughly ellip- f^ 0 N r A N A I i IV V 0 M. R A S K A Fig. 5. Diagram to show location of Black Hills. tical in outline, situated on the western border of the state of South Dakota, but extending also into Wyoming. See Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
