Feet. 
L92 CEMENT MATERIALS AND INDUSTRY. [hull. : 
The strata exposed in the quarry are as follows, beginning at the surface: 
Section at Sibley quarry ', Wayne County, Mich. 
1. Thin-bedded gray limestone, suitable for use as a flux 
2. "Upper 6-foot bed," a gray limestone, containing96 percentCaC0 3 ; used in 
alkali works; a portion of the lower part of the bed, about 8 inches in 
thickness, is now rejected on account of its containing too much bitumi- 
nous matter 
3. Fossiliferous blue-gray limestone, containing 90 per cent CaC0 3 ; suitable 
for use in alkali works 
4. "Second 6-foot bed," a blue-gray limestone, containing from 94 to 95 per 
cent CaC0 3 ; used as a building stone and in alkali works 
5. ' ' Five-foot bed, ' ' very similar to ' ' Upper 6-foot bed " 
6. ' ' Cherty bed, ' ' a cherty limestone, not at present utilized . . : 
7. "Third 6-foot bed," a blue-gray limestone, with a little chert in its lower 
portion; used in alkali works and as a building stone 
8. "Nine-foot bed," a fossiliferous gray limestone; used in the manufacture 
of beet sugar and suitable for making Portland cement 
9. " The 6-foot Magnesian limestone, ' ' dove colored 
10. "The 8-foot bed," a thick-bedded gray limestone; used as building stone. 
11. "The 10-foot bed," a gray limestone, of which the upper 3 feet contains 
about 85 per cent, the next 3 feet 95 per cent, and the lower 4 feet about 
80 per cent CaC0 3 ; the low T er portion contains from 3 to 4 per cent Si0 2 ; 
the middle portion of the bed is very fossiliferous 
12. Brownish limestone, containing 15 per cent Si0 2 , .5 per cent MgO, and about 
85 per cent CaC0 3 ; this rock is marked with white spots, thought to be 
aluminum silicate; used as building stone; opened to a depth of about. . 
Total 
Chemical analyses of certain of the beds described above are given below T : 
Analyses of limestone from Sibley quarries. 
[Analyst, K. J. Sumlstrom.] 
10 
63. 
Constituent. 
Calcium carbonate 
(CaC0 3 ) 95.50 
Magnesium carbon- 
ate (MgC0 3 ) 2.36 
Alumina (A1 2 3 ) ----- • 30 
Silica (Si0 2 ) j 1.04 
Total 99. 20 
5. 
South 
part of 
quarry. 
5. 
North 
part of 
quarry. 
99. 26 
.21 
Trace. 
.50 
99.97 
93. 28 
4.11 
.40 
1.90 
99. 69 
Upper 
part. 
97.33 
1.84 
Trace. 
.64! 
Central 
part. 
99. 00 
.22 
Trace. 
.54 
99.81] 99.76 
8. 
Lower 
part. 
95. 62 
3.15 
Trace. 
.96 
99.73 
80.04 
15.96 
2.70 
1.02 
99.72 
in. 
89. 05 
8.08 
Trace 
2.20 
99. 33 
11. 
Centre 
part. 
95. 0'j 
I 
4.0 j 
Trace t] 
.5 : 
90.5 
TEA VERSE a ROUP. 
Russell describes this formation as follows: 
The rocks designated by this name consist principally of shale and limestoi 
occur in succession next above the Dundee formation, and belong to the Devon! 
system. They form a belt, about 2 miles wide, which crosses Wayne and Mom 
