274 The American Geologist. November, 1903. 
fornicnsc, Chonetes dahnaniand) 4°o 
Devonian: 
4. Alternating chert and flint strata 4° 
5. Massive light colored marbled limestone, (Acervularia davidsoni 
abundant) 35 
6. Stratum of grit rock 15 
Silurian: 
'7. Red to brown fossiliferous limestone (Orthis davidsoni, Strom- 
bodes pentagoiiis) 65 
Tonto Formation: 
8. Massive to shaly, brown to red, coarse, cross-bedded viterous sand- 
stone 600 
9. Red, Cleavage-jointed shales 4° 
10. Gray to red sandstone falling apart into angular blocks 7° 
11. Marbles, limestone 35 
12. Vitreous to soft, red, purple, green and white sandstone 
and shale, a conglomerate completing the series 15° 
Algonkian : 
13. Hornblende biotite granite and olivine diabase (intrusive) 
and dioryte 120 
14. Vitreous, soft, red, purple, green and white sandstone and 
shale 300 
15. Conglomerate I0 
Archaean: 
16. Gneiss 100 
17. Granite and allied rocks 600 
Total 2635 
Section xi. On Corrixo creek {Gilbert). 
Quaternary: feet 
1. Coarse gravel composed of vitreous sandstone quartzyte and 
gneiss boulders 5° 
Aubery Group: 
2. Massive cross-stratified, yellow sandstone 150 
3. Red and gray shales, interrupted with calcareous beds.... 400 
Upper Red Wall Group: 
4. Dark gray limestone (Nautilus occidentals, Bellerophon cras- 
sus, Euomphalus (like E. nodus), Machrocheilus, Pleuroto- 
maria, Murcliisonia, Allorisma, Aviculopectcn interlineatus, 
Productus smeireticulatus, Archaeocidaris, Fenestella shumar- 
di(f), Galuconome) 100 
5. Alternating cream, or gray and red shales ; soft and carved 
by rain, with vertical flutings 5°° 
6. Bedded red sandstone, shaly at base 200 
7. Gray limestone with carnelian, fossils .-.nd chert (Arthyris 
subtitila, Spirifer cameratus) 20 
Total *I42Q 
*The age of the rocks is inserted by the writer. 
