144 
GEOLOGICAL REPORT-THIRTY-FIFTH PARALLEL. 
11 Octobre.—Du Camp Douglas au Camp 
Placers. —East side of Indian spring on trouve 
des veines de copper et peut etre de gold. Je 
prends plusieurs specimens a San Pedro. Du 
camp a San Pedro on est constamment sur le 
Trias superieur, peu apres San Pedro on tra¬ 
verse encore le calcaire carbonifere, qui plonge 
a l’est, et est reserre entre le rio de San Pedro 
et le New Placer, ou l’on voit horizontalement 
le Trias et le Jurassique, le new placer dirige 
est 30° nord, est plus ancien que les Rocky 
mountains. Entre l’old Placer et le New 
Placer mountain il n’y a pas de formations 
visibles mais de l’alluvion. 
12 Octobre. —A moitie cbemin entre Tuerto 
et Galisteo a Test de gold mountain on passe 
un dyke de roclie pyroxenique ? comrne a Sine- 
guilla, dirige nord, south. Du Camp Placer 
on suit une vallee nord est. entre Fold et New 
Placer mountains. Les roclies sont quartz- 
euses et feldspatbiques. Puis on a le Trias 
coupe dans plusieurs directions, par des dykes 
de trap ; Fun va est est sud a l’ouest ouest nord; 
on a ensuite en allant plus a l’est et au nord, le 
terrain jurassique jaunatre avec Lucina ; gres 
jaune ; argile sableuse gres a la partie inferi- 
eure. Ce terrain Jurassique incline a l’est; 
est horizontal contre une montagne de granite 
quartzeux qui va du nord est au sud ouest 
comme le New Placer. Ce qui prouve que ces 
montagnes sont anterieures aux Rocky mount¬ 
ains. Le Jurassique s’etend nord est sans in¬ 
terruption qu’un peu au rio de Galisteo. A 3 
millesnord de Galisteo je trouve dansdes argiles 
sableuses-[?] comme le gres superliassique 
des environs de Salins ; une dent et vertebre de 
Saurien, un Ostrea Jurassique- [?] et une 
espece d’ Inoceramus ou mieux de Plicatulas. 
On voit sur les plaquettes de gres des debris 
nombreux, ressemblant a des os brises de 
poissons ou sauriens. On a ces argiles jusqu’au 
Camp D. Pas de diluvium; entre Placer et la 
vieille montagne pres de Galisteo. 
13 Octobre.—Du Camp D au Camp E, d 
Pecos village. —Peu apres le camp on quitte le 
terrain Jurassique, et l’on suit jusqu’a old 
October 11.— From Camp Douglas to Camp 
Placer. —On the east side of Indian springs 
we found veins of copper ore, perhaps aurifer¬ 
ous. I procured several specimens at San 
Pedro. From the San Pedro camp we are 
continually upon the superior Trias. A short 
distance from San Pedro we again cross the 
carboniferous limestone, which dips to the 
east and is shut in between the Rio San Pedro 
and the New Placer, where we also find the 
Trias and the Jurassic. This New Placer has 
the direction E. 30 N., and is older than the 
Rocky mountains. Between the Old Placer and 
the New Placer mountain there are no forma¬ 
tions visible, except the alluvium. 
October 12.—Half way between Tuerto 
and Galisteo, on the east side of Gold moun¬ 
tain, we passed a dyke of pyroxenic (?) rock, 
like that at Sineguilla, with a direction north 
and south. From Camp Placer we followed 
the valley towards N.E., between the Old and 
New Placer mountains. The rocks are quartzose 
and feldspathic. Then we find the Trias cut 
in several directions by trap-dykes ; one has 
the direction E.E.S. and W.W.N. On going 
further to the east and north, we find the 
yellow deposites of Jurassic age, containing 
Lucina; yellow sandstone and grey sandy 
clays at the inferior part. This Jurassic for¬ 
mation, inclined towards the east, is horizon¬ 
tal against a mountain of quartzose granite 
which trends from northeast to southwest, as 
the New Placer, which proves that these moun¬ 
tains are anterior to the Rocky mountains. 
The Jurassic extends northeast without in¬ 
terruption, except a little at the Rio Galisteo, 
three miles north of Galisteo. I found in 
sandy clays,-[?] sandstone, like the 
super-liassic sandstone of the vicinity of Salins; 
a tooth and vertebra of a Saurian, a Jurassic 
Ostrea , —-[?] and a species of Inoce¬ 
ramus. , or rather of Plicatulus. We saw upon 
the slabs of sandstone numerous fossil fragments 
resembling broken bones of fishes or saurians. 
We find these clays as far as Camp D. No 
diluvium between Placer and the Old mount¬ 
ain near Galisteo. 
October 13.— From Camp D to Camp E, at 
Pecos village. —A little beyond camp we leave 
the Jurassic formation, and follow canons in 
