MINERAL RESOURCES OF THE STATE OF NEW YORK 



261 



many quarry sites, such as at Chaumont, Clayton, Cape Vincent 

 and Watertown, Jefferson county; Lowville, Port Leyden and 

 CoUinsville, Lewis county; Boonville, Prospect and Trenton Falls, 

 Oneida county; and Middleville, Herkimer county. The limestones 

 vary in composition and physical character according to locality and 

 geologic position. They are predominantly dark gray and some beds 

 nearly black, often highly fossiliferous. As a rule they contain 

 small amounts of magnesia and run as high as 97 or 98 per cent 

 calcium carbonate. The lower part of the group is heavily bedded 

 and well adapted for building stone; the upper beds are thinner 

 and often shaly. Limestones of the Trenton group are exposed in 

 the Hudson valley below Albany, as detached areas within the 

 Hudson River shales. EckeP has called attention to the occurrences 

 in the Poughkeepsie region. Limestones made up of a series of 

 exposures with the same trend, are found near Rochdale, Pleasant 

 Valley and Salt Point, east and northeast of Poughkeepsie. They 

 contain some magnesia, up to the maximum limit admissible for 

 Portland cement, and also considerable silica. There are no quarry 

 operations under way at present in the district. 



Analyses of Ordovician limestones 





I 



2 



3 



4 



S 



6 



7 



8 



9 



10 



II 



Si02 



12 



1.05 

 16.7^ 



10.46 

 1-93 

 1.8 



17-65 



3.42 



j 1.70 



S-o8 



8.02 



4.08 

 2.38 



9.22 



4.16 

 1.70 



4.42 

 / 2.23 

 1 .16 



17.28 



S-21 



.92 



1 ■'' 



2.43 



.41 



I. 00 



1.38 

 -58 



-72 



.72 



A1203 





FejOs 



r-50 



MgO 



.80 



MgCOs 



37-74 



18.46 



3 02 





CaO 



26. 3i 



27-75 



47-14 



46.28 



45-24 



51-00 



55-26 



54-28 



CaCOa 



SS-87 



58.17 



96.24 



CO2 



39-1 



40.99 









n. d. 



n. d. 



44.00 



















12 



13 



14 



IS 



16 



17 



18 



19 



20 



21 



22 



SiOz 



-7 

 I. 



•7 

 1.4 



3-9 

 1-3 



"i.'sS 



I. I 



.8 

 .5 



•75 



6.13 

 -79 

 .6) 



I. 25 



6.7 



1 3.03 



1 -21 



8-45 



2.72 



-84 



2. 59 



1. 21 



.61 



1.04 



52. 



42. 



3- 96 



)■■' 



3- 09 



J1-I5 

 1 -49 



6.5 



AI2O3 



1.67 



FezOs 



MgO . . . 



-76 



MgCOs 



2.4s 



'52.'78 



tr 



3-42 



3.78 



1-63 



2.68 



CaO 



53.9 



52.15 



53-17 





CaCOs . . . 



89-15 



84.6 



91.27 



94- It 



88.44 



CO2 • 



42-5 



n. d. 



45 - 08 





















1 Ordovician limestone, Tompkins Cove, Rockland county. N. Y. State 

 Museum Bui. 44. 



2 Ordovician limestone, Newburgh. Miller quarry. Idem. 



3, 4, 5 Trenton group, near Poughkeepsie. U. S. Geol. Survey Bui. 522. 



1 Portland Cement Materials and Industry in the United States. 

 Geological Sur. Bui. 522, 1913, p. 275-76. 



U.S. 



