INDEX 



Adirondack region, geologic his- 

 tory, 6. 

 Alder Creek, 20, "28, 44, 45. 

 Andesine, 13. 



Anorthoclase, 11, 12, 13, 14, 15. 



Anos Siding, 12. 



Apatite, 11, 12, 13. 



Asaphus platycephalus, 19, 20. 



Ash ridge, 14, 34, 48. 



Atwood, W. W., cited, 33. 



Augite, 11, 12, 13. 



Bardwell Mill, 20, 28, 34, 43. 



Beekmantown limestones, 7, 16, 34. 

 Bellerophon bilobatus, 19, 20. 

 Big brook, 48. 



Big Woodhull creek, 9, 14, 41, 46, 47. 

 Biotite, 10, 11, 12. 

 Biotite mica, 11, 13, 15. 

 Black creek, 9, 16, 20, 43, 44, 45, 46, 

 48. 



Black river, 8, 9, 17, 33, 34, 43, 45, 

 46, 47. 



Black River limestones, 7, 16, 17, 39. 

 Brigham, A. P., cited, 8, 40, 45. 

 Bronzite, 11, 12, 13. 

 Building stone, 47. 



Calymmene callicephala, 19, 20. 



scnaria, 19. 

 Canajoharie, 38. 



Ceraurus plcurexanthemus, 19. m 

 Chamberlin, T. C, cited, 40. 

 Chlorite, 13. 



Cincinnati creek, 9, 20, 24, 29, 31, 46. 

 Clarke, J. M., cited, 18, 30. 

 Clay, 43-44, 48. 

 Clayton, 41. 

 Cold brook, 16, 34, 44. 

 Contorted strata within the Trenton, 

 30-33. 



Crinoid segments, 19, 20. 

 Crosby, W. O., cited, 31. 

 Crystal creek, 16, 17, 44. 



Crystalline limestones, 9. 

 Cumings, E. R., cited, 17, 18, 19, 20, 

 27, 30. 



Cushing, H. P., cited, 6, 10, 16, 20, 21, 



22, 29, 33, 35, 37, 38, 40, 42. 

 Cyrtoceras sp., 19. 



Dalmanella testudinaria, see Orthis 



(Dalmanella) testudinaria. 

 Darton, N. H., cited, 18, 23, 24. 

 Dendrocrinus gracilis, 20. 

 Diamond hill, 35. 

 Dikes, 7. 



Dip of the Paleozoic formations, 28. 

 Diplograptus amplexicaulis, 19. 

 Dolgeville fault, 23. 

 Dolgeville shales, 20-21 ; thickness, 



37 ; absence of, 37-39. 

 Drainage, 8-9, 45-46. 



Economic geology, 46-48. 

 Endoceras proteiforme, 19, 20. 

 Enos, 9, 10, 14, 15, 43, 44, 46, 48. 

 Enstatite, 11, 12, 13. 

 Erratics, 45. 

 Escharopora recta, 20. 



Faults, 7, 23-27. 



Feldspar, 10, 11, 12, 13, 15, 48. 



Folds, 22-23. 



Foliated structure of Precambric 



rocks, 29-30. 

 Forestport, 11, 12, 14, 15, 33, 36, 37, 



41, 4.3, 44, 46, 47. 

 Fourth lake, 10. 



Gabbro, it, 15. 



Garnet, 10, 11, 15. 

 Glacial boulders, 45. 

 Glacial geology, 39-46. 

 Glacial till, 4T-42. 



Gneiss, see Grcnville rocks ; Syenite 

 gneiss. 



Grant, 20, 23, 28, 43, 45, 46, 47. 



49 



