PENNSYLVANIAN FORMATIONS IN THE RIO GRANDE 807 
MAGDALENA SECTION 
Form | Column | Thick 
System | Series | Gr. 
5 
E 
8 3 
3 a 
3 eI 
3 5 3 
I} > we 
a n oo 
oO q 3S 
“3 a SS) 
=| oO 
oO Ay 
i: 
eM 
3 
1S) 
Miss. 
Pre-Cambrian 
Character Rocks 
Blue compact limestone for 
the most part  thick- 
bedded: Some shales. 
410 
125 
Shales, limestones and con- 
glomeratic sandstones or 
quartzites. 
Compact earthy limestone 
and shales. 
White conglomeratic quart- 
zite. 
Shales and quartzites with 
conglomerate at base. 
125 
Subcrystalline lime- 
stone with com- Ore 
pact 5-foot layer) Bed 
(Silver Pipe) near) ~ 
middle. 
Greenstone schists and 
granite. 
