LIME ATsTD CEMENT INDUSTEIES 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 Geo], of New Jersey 1868. p. 405) 



6 Calculated from CaCOs 



7 Calculated from CaCOs, MgCOg 



• 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, Rosendale 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 BrcAvster, 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) 



GEOLOaiC OCCUEKEE'CE 



Beds of limestone occur in deposits of almost every geologic 

 age from Archaean to Tertiary. In ^ew 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 !N^ew 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 



