LIME AND CEMENT INDUSTKIES 647 



SOURCES 



1 Sharpies, S. P. Staghorn coral, (see Am. jour. sci. Mar. 1871. p. 168) 



2 Hogbom, A. G. Bermuda coral reef rock, {see Neues jahrb. 1894. 1: 269) 



3 Bermuda coarse lagoon sediment. " 



4 Average of 14 analyses of the coral Lithothamnium. (see 



Neues jahrb. 1894. 1: 172) 



5 Oyster shells, (see Geol. of New Jersey 1868. p. 405) 



6 Calculated from CaCO s 



7 Calculated from CaC0 3 , MgC0 3 



8 Olcott, E. E. Crystalline Siluro-Cambrian limestone, Adams, Mass. 



For marble 



9 Limestone, Bedford Ind. (see Min. ind. 3: 505) 



10 Solenhofen lithographic limestone, (see G. P. Merrill. Stones for build- 



ing and decoration, p. 415) 



11 Egleston, Thomas. Limestone, Hudson N. Y. 



12 Trenton limestone, Point Pleasant, 0. Vide no. 10 



13 Surface rock, Bonne Terre Mo. 



14 Limestone, Chicago, (see Min. ind. 4: 508) 



15 Hydraulic limestone, Coplay Pa. 



16 Hydraulic limestone, Eosendale N. Y. (see Min. ind. 2: 49) 



17 Silicious limestones, Chicago 111. Vide no. 14 



18 Woodward, R. W. Miocene limestone, Chalk Bluffs Wy. (see 40th par. 



sur. 1: 542) 



19 Brewster, B. E. Eocene limestone, Henry's Forks Wy. (see 40th par. sur. 



1: 542) 



20 Whitfield, J. E. Travertin below hotel terrace Yellowstone park, (see 



9th an. rep't director U. S. geol. sur. p. 646) 



GEOLOGIC OCCURRENCE 



Beds of limestone occur in deposits of almost every geologic 

 age from Archaean to Tertiary. In New York state they are 

 found in every formation except the Carboniferous, Triassic and 

 Cretaceous. 



Geologic age can not be looked on as an indication of purity or 

 extent. 



In New York the purest limestones come chiefly from the 

 Trenton, though some are found in the Cambrian. Those of the 

 Helderberg rocks seldom average over 92# lime carbonate. The 



