270 The American Geologist. November, 1903. 
canic rocks, shales, etc.; 11, Archaean schists, granites and al- 
lied rocks. 
STRATIGRAPHICAL SECTIONS. 
Section i. Canon creek, Arizona, from the source of the stream to 
its confluence with Salt river. 
Quaternary: feet 
I. Coarse uncemented gravel, of gneiss and quartzyte bould- 
ers 125. 
Aubery Group: 
Calcareous sandstones, followed by soft shales and an occa- 
sional limestone stratum 700 
Massive, crossbeded yellow standstone 525 
Upper Red wall Group: 
4. Compact gray limestone 70 
5. Red and purple sandstone 500 
Lower Red Wall Group: 
Alternating gray limestone and red shale 400 
Tonto Formation: 
Sandstone 500 
Algonkian: 
Biotite granite, hornblende dioryte and olivine diabase 800 
9. Limestone with coralloid mottling 50 
10. Shale series : The shales are greenish and purple in color. 
They are soft and thin and are interstratified with pale red 
sandstones and an occasional mottled limestone stratum 700 
II. Massive lava bed, crumbling to green sand 100 
12. Vitreous red, heavy-beded sandstone 100 
13. Conglomerate 40 
Archaean. 
14. Granite and allied rocks 600 
Total thickness of rock exposed estimated as above 5210 
Section 11. . Canyon creek at the crossing of the government trail, 
partly measured by aneroid barometer (after Gilbert). 
Quaternary: feet 
I. Coarse uncemented gravel of quartzyte and gneiss boulders.. 20 
Aubery Croup: 
2. Massive cross-bedded yellow sandstone 525 
Upper Red Wall Group: 
3. Compact gray limestone \St>irifer cameratu.<i\ 65 
4. Red and purple sandstone, soft at top, massive below 500 
Lower Red Wall Group: 
5. Alternation of gray limestone and red shale : 
a. Limestone 5 
b. unseen, shale ? 100 
c. Limestone (Athyris subtilita) 10 
d. Red Calcareous sandstone 4 
e. Shale 40 
