Geology of Ft. Apache Region, Ariz. — Reagan. 273 
3. Yellow clays inter-stratified with loose sand 4 
4. Cobble stone stratum 1 
5. Light yellow to pink, lithified, stratified rock, composed of fine 
grains of Archaean and Tonto rocks 10 
6. Dark brown partly lithified sandstone 1 
7. Yellow to brown and pink cross-bedded sandstone 10 
8. Conglomerate series 20 
9. Porphyry, gneiss and granite rocks (all intrusive) 100 
Tonto: 
10. Sandstone and shale 500 
Archaean: 
11. Hornblende biotite granite and olivine diabase and horn- 
blendic dioryte 500 
Total 1155 
Section viii. Red Wall cliff cast of. the Agency at Whiteriver. 
Upper Red Wall Group: 
feet 
1. Compact yellowish gray limestone (Spirifer cameratus, Pro- 
ductus costattus, P. scmireticulatus 75 
2. Red gypsiferous shales, with limestone and sandstone 800 
3. Gray to white limestone interstratified with red shale (Pro- 
ductus semircticulatus, Productus cora) 50 
Total 925 
Section ix. Tonto bluff, point Chiddcsche on Canyon creek. 
Tonto: 
1. Brown to red, coarse vitreous massive sandstone, breaking up 
in angular blocks 200 
2. Red shale showing cleavage structure 50 
3. Gray sandstone weathering red. falling apart in angular blocks 175 
4. Conglomerate stratum 20 
Algonkian: 
5. Dark crystalline diabasic lava bed, which rarely form- into 
cliffs, its rocks crumbling into a light olive-green sand 500 
6. Not seen ; shaly sandstone? 80 
Total 925 
Section x. From Tanner's residence on Cibieu to the Salt Springs 
on Salt river near its confluence with Canon creek. Upper Red Wall 
Group: 
feet 
1. Alternating limestone and sandstone (Productus cora, Spir- 
ifer earner atus, Catamites caiuiaeformis) 60 to 120 
2. Millstone grit, calcareous sandstone shaly to massive 20 
Lower Red Wall Group: 
3. Alternating gray limestone and shale varying in color from black 
to red (Orthis porcata, Orlhis Una. Spirifer fornacula, S. striates; 
S. pre-cxtensus, S. plains, Orthonota parallcta ; Lith&strotion cali 
