r90 NEW YORK STATE MUSEUM 



The level from which the rock is obtained at the May kiln is 

 about 12 feet below the level of the silicious concretions; that at 

 the Snow kiln probably a few feet lower. 



Cement industry 



The Iroquois Portland Cement Co., with headquarters at Cleve- 

 land O., has erected an extensive plant 1 mile east of Caledonia, 

 Livingston co., and y 2 mile south of the Monroe county line and 

 has been operating during the latter half of the year. 



The plant is equipped on the most modern plan, having labor- 

 atory, engine house, machine shop, storehouse for raw material 

 and mill, all in separate fireproof buildings. 



In the mill are clay and marl shed, drying room, room for grind- 

 ing the raw product, burning room, room for grinding the burnt 

 product and storage and packing room. The equipment of these 

 is as follows : two rotary kilns, 30 by 50 feet, for drying marl and 

 clay ; two tube mills for raw grinding ; 2 rotary kilns, 60 by 6 feet, 

 for burning; and two tube mills and one Williams mill for grind- 

 ing and refining. The works are run by electricity, the power 

 plant consisting of three 250 horse power boilers and two 250 

 horse power engines, tandem compound, directly connected with 

 two 200 kilowatt alternating current generators, by which power 

 is distributed to all parts of the plant where it is to be used. 

 Alternating motors, inclosed in dust-proof cases, are used. 



The marl deposit of the company begins just east of the plant 

 and extends in an easterly direction along both sides of the 

 tracks of the New York Central & Hudson River Railroad and 

 Lehigh Valley Railway for a distance of about 2 miles. It lies 

 in a narrow valley 80 feet above the Genesee, inclosed by hills of 

 gravel, 25 to 100 feet high, and drained by Dugan creek, a small 

 stream. The deposit covers an area of 400 acres and runs from 

 5 to 15 feet in depth, averaging 7. It is a very pure, cream- 

 colored calcium carbonate, which appears to have been formed 

 by precipitation or incrustation on vegetation in this swamplike 

 area. It is usually very fine grained, but in some portions it is 

 said to carry layers, from a few inches to several feet in 

 thickness, of grit or coarse travertine. This however is usually 

 fine enough to go directly to the mill without grinding. In some 



