158 
GEOLOGICAL REPORT—THIRTY-FIFTH PARALLEL. 
forme entierement la droite il parait s’etendre 
jusqu’ au pied de Cerbat mont. 
6 Fevrier.—Du No. 54 7 au No. 55'.—On 
fait neuf milles tout le temps sur le diluvium, 
tres puissant et a gros cailloux, dans le lit de 
Big Sandy creek. 
7 Fevrier.—Du No. 55' au No. 56', quatre 
milles et demi. Sur le diluvium qui a 1,000 
pieds d’ epaisseur. Presque pas de terre vege- 
tale. 
8 Fevrier. — Du No. 56' au No. 57'.—Les 
deux premiers milles sont sur le diluvium ; 
puis on entre dans un canon a l’ouest, au 
milieu de montagnes de 5 a 800 pieds de hau¬ 
teur, de granite , gneiss veines de quartz et de 
feldspath. Direction generale sud sud est, 
nord nord ouest. 
9 Fevrier.—Du No. 57' au No. 58'.—Tout 
le temps entre des collines granitiques. A 
l’opposite du Camp 58', on a un cliff perpen- 
diculaire avec table de lave basaltique venant 
du nord est. Dans le diluvium qui forme une 
petite mesa au camp meme, a cause de la 
vallee qui s’elargit et du point d’affluence du 
Bill Williams' fork avec Big Sandy creek , il 
y a des cailloux de lave noire et rougeatre. 
10 Fevrier.—Du No. 58' au No. 59', 6J 
miUes. —Une partie sur le diluvium; des mon¬ 
tagnes granitiques autour ; et une mesa volca- 
nique a notre graucbe ; on vient camper a l’en- 
tree cl’un nouveau canon. 
11 Fevrier.—Du No. 59' au No. 60'.—Tout 
le temps dans un canon, il suit en zig-zag 
S.S.E. et quelquefois S.O., c’est un granite a 
gros cristaux de feldspath blanc et rose, mica. 
Noir, porphyre rouge quartzifere, quelquefois 
dykes de trap de quartz allant S. 70° E. a N. 
70° W. qui est la direction des montagnes de 
Mogoyon. Le Mont Artillery au pied duquel 
est notre camp est pointu avec flanc noiratre, 
comme de la lave volcanique diluvium plus 
considerable dans le fond de la vallee. 
12 Fevrier.—Du No. 60' au No. 61', 7£ 
milles. —On sort du canon a l’extremite, il y a 
dutrap formant deux grandes montagnes. La 
| This drift bounds our route on the right, and 
appears to extend as far as the foot of Cerbat 
mountain. 
February 6.— From Camp No. 113 to Camp 
No. 114.—AVe travelled nine miles upon the 
diluvium, very thick, and containing large 
j pebbles, in the bed of Big Sandy creek. 
February 7.— From Camp No. 114 to Camp 
No. 115, (4| miles.) —AVe passed upon the di¬ 
luvium, which has a thickness of 1,000 feet. 
There is scarcely any soil or vegetable mould. 
February 8.— From Camp No. 115 to No. 
116.—The first two miles are upon the dilu¬ 
vium ; we then enter a canon in the west in the 
midst of mountains from 500 to 800 feet in 
height; these are of granite and gneiss, and 
traversed by veins of quartz and feldspar. 
General direction south-southeast, north-north¬ 
west. 
February 9.— From Camp No. 116 to No. 
■ 117.—AVe were continually among granitic 
rocks. Opposite Camp No. 117 we found a 
perpendicular cliff with a table-like summit of 
basaltic lava, which came from the northeast. 
In the diluvium which forms a little mesa just 
at camp, by reason of the widening of the valley 
and of the point of affluence of Bill AVilliams’ 
fork with Big Sandy creek, there are pebbles 
of reddish and black lava. 
Febmiary 10.— From Camp No. 117 to No. 
118, (6^- miles.) —A part of the way we were 
upon the diluvium ; granitic mountains are 
around us and a volcanic mesa at our left. AVe 
came to camp at the entrance of a new canon. 
February 11.— From Camp No. 118 to No. 
119, —The whole distance traversed was in a 
narrow and zig-zag canon, in a south-southeast 
direction, sometimes southwest. The rock is 
granite, with large crystals of white and rose- 
colored feldspar and black mica. Also quartz- 
iferous red porphyry and dykes of quartz and 
trap running in the direction south 70° east to 
north 70° west, which is the direction of the 
Mogoyon Sierra. Artillery mountain, where 
we are encamped, is pointed, and has a blackish 
side, like volcanic lava. Diluvium in the bot¬ 
tom of the valley is more abundant. 
February 12.— From Camp No. 119 to No. 
120, (6^ miles.) —AVe leave the canon, and at 
the end there is trap-rock forming two great 
