358 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213.1 
It is regularly bedded, the layers ranging from 6 inches to nearly 3 
feet in thickness, thus affording fine cut and sawed dimension stone 
and flagging. 
The quarries of the Illinois Stone Company in the same vicinity 
show the same even-bedded limestone and produce dimension and 
rubble stone and flagging. 
At Sag Bridge the quarries of the Phoenix Stone Company produce 
a fine grade of even-grained, solid limestone. The courses increase 
in thickness downward, becoming nearly 8 feet thick at the bottom, 
with little or no fracturing. The product is fine cut and sawed 
dimension stone, rubble, and five grades of crushed stone for 
macadam. 
The quarry of the Calumet Stone Company, 1-J miles east of Sag 
Bridge, shows stone of excellent quality. A small quarry on t he north 
side of the Sag has turned out a small amount of a dense, fine-grained 
rock of very good quality. 
These are the principal localities yielding good dimension stone, as 
here the strata have suffered little or no disturbance and hence show 
little fracturing. The facilities for transportation by railroad and by 
canal are excellent. 
The quarry 1 mile west of Elmhurst, on the Chicago and North- 
western Railway, puts out building stone, including some dimension 
stone. 
RUBBLE, MACADAM, AND LIME. 
As most of the quarries furnish crushed stone for macadam and 
rubble for foundations, and sonic furnish lime, they will be noted in 
oidcr, beginning with those in Chicago. The rock at all the quarries 
is well adapted for macadam, as it is a hard, gray dolomite, in places 
very siliceous, and the fractured condition of the strata makes it com- 
paratively easy to remove. At the intersection of Chicago and West- 
ern avenues, about three-fourths of a mile southeast of Humboldt 
Park, the quarries of the Artesian Stone and Lime Works Company 
produce crushed stone for macadam and lime. 
The quarries of the Chicago Union Lime Works Company at the 
intersection of Nineteenth and Lincoln streets, about a mile east of 
Douglas Park, have been excavated to a depth of 175 feet. The lime- 
stone is a dolomite containing about 54 per cent carbonate of lime and 
44 per cent carbonate of magnesium. 
The quarries of the Stearns Lime and Stone Company at Bridge- 
port, near Twenty-seventh and Halsted streets, produce lime and 
crushed stone for macadam. 
The quarries of Dolese & Shepard, at Hawthorne, on the Chicago, 
Burlington and Quincy Railway, produce building and dimension 
stone, crushed stone for macadam and concrete, and limestone for 
flux. 
At Thornton, on the Chicago and Western Indiana Railroad, the 
