148 
GEOLOGICAL REPORT-THIRTY-FIFTH PARALLEL. 
droite du courant de laves ; puis nous traver- 
sons la coulee ; jusqu’au Camp No. Y ou nous 
la quittons pour camper sur le granite rose a 
gros grains. Sur la droite de notre route, 
nous avons les gres Jurassiques jaunes et gris, 
et au-dessous pas de granite, et dans quelque 
ravines, on voit des gres rouge du Trias. Les 
couches inclinent a Test, 10 a 15° ; et la direc¬ 
tion des tetes de couches et du granite est 
nord-south, age des Rocky mountains. Pas 
de diluvion ; pas d’erratiques. Hauteur du 
Camp 7' de 7,000 a 8,000 pieds. 
17 Novembre.—Du No. Y au No. 8'.—Peut- 
etre hier, 2 miles avant d’arriver au camp et 
jusque pres du camp, ai-je passe des gres et 
calcaire carboniferes, c’est douteux, le matin 
nous ne faisons que 8 miles 4, et toujours sur 
le granite, sur le point de jonction avec la lave ; 
traversant quelque fois des portions de cal¬ 
caire. A notre Camp No. 8' on quitte la lave ; 
et l’on est sur le point de partage du volcan, 
new red et granite. La lave se retrouve autour 
de nous et specialement sur notre droite. A 
100 yards au nord on a le gneiss fortement re- 
leve au nord est ou nord. Au sud du camp, 
ce sont des gres rouges du Trias tres develop- 
pes, et plongeant sud sud ouest. 
18 Novembre.—Du No. 8' au No. 9'.—En 
partant du camp, on laisse la lave a droite; puis 
on s’eleve rapidement sur les couches du Trias 
du sommet; en tournant un peu au sud on 
traverse du calcaire gris bleuatre avec quelques 
couches de gres rosatre intercalees. Je n’ai 
pas ete capable de trouver des fossiles au nord 
ouest, et on la laisse sur la droite pour suivre 
des sables proven ant de la decomposition du 
gres jaune et blanc et rosatre Jurassique qui 
torment une cliff table regardant l’Est, et 
dont Inscription Dock fait partie. 
right hank of the lava currents; we then 
traversed the coulee , which is two or three 
miles wide, and then followed along its left 
hank as far as Camp No. 66, where we left it, 
and camped on a coarse-grained, rose-colored 
granite. On the right of our route.we have 
grey and yellow Jurassic sandstones, and 
above, near the granite, and in some ravines, 
we saw the red sandstone of the Trias. The 
beds dip to the east, 10 or 15 degrees, and the 
direction of the uplifted edges of the beds and 
of the granite is north and south, being of the 
age of the Rocky mountains. No diluvium or 
erratics. The height of Camp No. 66 is from 
7,000 to 8,000 feet. 
November 17.— From Camp No. 66 to No. 
67. —Yesterday, I perhaps passed carboniferous 
sandstones and limestones, two miles before 
arriving at camp, and even at camp, but it is 
doubtful. This morning we made only eight 
and a half miles, and were always on the 
granite, or the point of junction with the lava, 
sometimes crossing portions of the latter. At 
our Camp No. 67 we left the lava and were 
upon the point of division between the volcano, 
the New Red and granite. Lava is again seen 
about us, and especially upon our right. One 
hundred yards to the north we found the gneiss 
much upraised to the northeast or north. South 
of the camp there are very well developed red 
Triassic sandstones dipping south-southeast. 
November 18.— From Camp No. 67 to No. 
68 . —On going from camp we leave the lava 
on the right; then we rise rapidly upon the 
beds of Trias, with white gypsum near the 
summit; on turning a little to the south, we 
crossed some bluish-grey limestone, with some 
intercalated beds of roseate sandstone. I have 
not been able to find any fossils, on account of 
the cold and of the fog. I believe it is of the 
age of the lower Carboniferous, but it is doubt- 
ful. The beds incline strongly to the west, 
especially the limestones. (Direction of the 
Sierra de Zuni northwest and southeast.) 
We again descended between the lavas com¬ 
ing; from the south and the red sandstones of 
the Trias. We traversed this great lava field 
which extends towards the N.N.W., and we 
leave it upon the right, and follow sands pro¬ 
ceeding from the decomposition of the white 
