ROCKS. 



11 



Names. 



33 Slaty limestone. 



34 Slaty limestone. 



35 Slaty limestone. 



36 Slaty limestone. 



Localities. 



Williamstown, Massachusetts. 

 Cortland, Westchester. 

 Ashford, Massachusetts. 

 Stanford, Dutchess. 



37 Mica slate (with garnets). Dover, Dutchess, 



38 Mica and talcy slate. Amenia, Dutchess 



39 Slate. 



40 Talcose slate. 



41 Slate (black). 



42 Slate (green). 



Montrose, Dutchess. 

 Near Peekskill, Westchester. 

 Clinton, Dutchess. 

 Clinton, Dutchess. 



43 Mica slate (the alum rocks). Near Ameniaville, Dutchess. 



44 & 45 Slate. 



46 Slate (green). 



47 Talcose slate. 



48 Talcose slate. 



49 Slate. 



50 Micaceous slate. 



51 Talco-micaceous slate. 



52 Chlorite slate. 



53 Purple slate. 



54 - 57 Slate. 



Near Canaan centre, Columbia. 



Near Washington-hollow, Dutchess. 

 Canaan-gap, Columbia. 

 Hillsdale, Columbia. 

 Hillsdale, Columbia. 

 Taghkanic falls, Rensselaer. 

 Richmond, Vermont. 

 Canaan, Columbia. 

 Petersburgh, Rensselaer. 

 Hoosick, Rensselaer. 



58 Talcose slate (greenish). Saddle mountain, Massachusetts. 



59 Talcose slate. Taconic mountain, Rensselaer. 



60 Talco-fibrous slate. Taconic mountain, Rensselaer. 



61 Mica slate. Taconic mountain, Eensselaer. 



62 Slaty sani s. one. filliaiustown, Massachusetts. 



63 Crystalline quartz (veins in slate). Ancram, Columbia. 



64 Crystalline quartz (with copper ore). Washington, Dutchess. 



65 Quartz in chlorite (with oxide of manganese). Taconic mountain. 



66 Carbonate of iron. Stockbridge, Massachusetts. 



67 Limestone (with iron ore). Stockbridge, Massachusetts. 



68 Talc and mica cemented by oxide of iron. Stockbridge, Mass. 



69 Hematitic iron ore (stalactitic). Stockbridge, Massachusetts. 



