PERMO-CARBONIFEROUS OF NORTHERN NEW MEXICO 7 
Illinois, and Pennsylvania, that of the last-named region definitely 
known to be Pennsylvanian. 
Below is given a section (Section I) of the west wall of the 
Cobre Canon as far down as the horizons yielding fossils of paleo- 
zoic age. It must be especially remembered, however, that this, as 
SECTION I 
EL COBRE 
Yellow sandstone and conglomerates.......... 75 Upper Trias 
iRurplishtandtoray clays... s9.-.0s.25.6 one. 4o = 
UTplIShisAaMaStOMeS:.ccmerwe as eee le oss ca a. 20 Lower Trias? Barren 
Purplish clays and nodular sandstone ......... 25 oy 
IRedesamd stone mmr iie eric allies Soe eet es 5 c i 
Brichteredeclaygerer mck sate ahah cies meee oc 35 a : 
UI ORCL Aare ate Walon cee ee caer Peele cio navel sere le 12 5 “s 
BrightsredssandStomes= <2 y.0 san--:. / 2-025. 22 we “ 
Coarse purplish sandstones . ; 12 ie s 
Bright red clay with preenish modules ond 
OUT NSDANUSHRe wera me ate lcea tc res ee es ikere) o “ 
Coarse, hard purplish sandstone.............. 8 eS S. 
Bright red clay and sandstone................ 65 ce e 
Hard red and purplish sandstone . seinen) ak i 
Bright red sandy clay, with purplish streaks OO mn fe 
Burplish and dark brown clay... J... 4...-4... 22 ae Hs 
Rediclayzand hard red sandstone. 2.2... -..: 30 a ‘i 
Eard purplishysandstoness 4.<.2:-.4-.+-40.+- As oe * 
Re GeClayere cern enn ce eee cee RISE, Boe! ay 7 iP 
eunplersanadstomes rue waa ce wea. Se secs B ? 
REGUCLA VER ee ee nn De eee ant earn 22 
Permo-Carboniferous: red, brown sandstones and 
ClaystetossiliferOUSes rte cers ee ele ae 
also the other section given in this paper, will not apply in detail to 
any other place, since it has been our experience in the Red Beds 
that detailed sections made in any given place cannot be depended 
upon perhaps a quarter of a mile away. The top of this section, 
as already stated, yields vertebrate fossils of Upper Triassic age, 
and some of the Triassic vertebrates described by Cope from New 
Mexico came from the El Cobre Canon. 
A survey of the surrounding country from the summit here, 
as also from the Piedra Lumbre, shows everywhere these basal 
Upper Trias rocks as the lower or lowermost exposures. 
