CONTENTS. 



Paos. 



2. Calciferous group, including the Calciferous sandrock and the Fucoidal layers, 30 



3. Black-river limestone, including the Chazy limestone, the Birdseye limestone, and the 



base of the Trenton limestone, 36 



4. Trenton limestone, 46 



5. Utica slate. Black slate or shale, Fairfield slate of the Reports, greywacke or Metallife- 



rous grey^vacke of Eaton, 56 



& Hudson-river group, Frankfort slate and rubblestone, Green slate and ditto of the Re- 

 ports, with the shales of Pulaski, greywacke or Metalliferous greywacke of Eaton ; 

 being the predominant mass which occupies the Hudson river valley, from the range 

 of West-Point to the north of Troy, &c 60 



7. Grey sandstone of Oswego, 67 



8. Medina sandstone, red sandstone of Oswego and Niagara, sandstone of the Reports, Sali- 



ferous rock of Eaton 71 



9. Oneida conglomerate, Shawangunk conglomerate, Millstone grit of Eaton, Grey band of 



Rochester ; being a sandstone to the west and a conglomerate with sand to the east, ... 75 



10. Clinton group, lower part of the Protean group, divided into Clinton and Niagara groups; 



Ferriferous slate, and Ferriferous sandrock of Eaton, 70 



11. Niagara group, Lockport group, upper part of the Protean group of the Reports, Geodife- 



rous limerock and Calciferous slate of Eaton, 90 



12. Onondaga-saU group, Calciferous slate or Second greywacke, with Shell limerock of 



Eaton, 94 



Rod shale, the first and lowest deposit, 96 



Second deposit, 97 



Third deposit contains all the workable plaster: It is the only known point or source 



* from whence the salt of the brine of the saline was obtained, 98 



Fourth or Magnesian deposit, the upper part of the group, 107 



13. Water-lime group. Water-lime group of Manlius, Hydraulic limerock of Eaton, 110 



14. Pentamerus limestone 117 



15. Catskill shaly limestone, Delthyris shaly limestone, and Scutella limestone of the Reports, 120 



16. Oriskany sandstone, White sandstone of the Report of 1838, 123 



17. Cauda-galla grit. Cocktail grit of Dr. James Eights 127 



18. Schoharie grit, Shell grit, 131 



19. Onondaga limestone. Grey sparry limestone of the Reports, 132 



20. Comiferous limestone, including Seneca limestone I39 



21. Marcellus shales, commencement of the Pyritiferous rock (or Third greywacke) of Eaton. 



Two divisions: lower calcareous, fossiliferous and somewhat fissile; the upper shaly, 

 breaking into small irregular fragments, 146 



22. Hamilton group : this group embraces all the masses of the Annual Reports, noticed under 



the head of Skaneateles shale. Dark slaty fossiliferous shale, Compact calcareous blue 

 shale, Olive shale, Ludlowville shale, Encrinal limestone, Moscow shale, shales near 

 Apulia and Sherburne, and Cazenovia group, I50 



23. Tully limestone, 163 



