RESUME AND FIELD NOTES. 
155 
geant au eud sud ouest sous un angle de 60 a 
80 degres; les assises sont brisees; la direction 
gen^rale des tetes des couches est l’ouest ouest 
nord; on voit dans cette direction une grande 
montagne non volcaniques, a vingt milles de 
nous. Vers le Camp No. 38', la lave recouvre 
de nouveau les gres carboniferes et l’on a la 
lave jusqu’au Camp 38'. Ces gres carboniferes 
rouges sont schisteux tres-durs, plus durs en 
general que ceux du New Bed des Prairies. 
Pas de diluvium. 
12 Janvier.—Du No. 38''au No. 39'.—On 
fait quatre milles et demi dans une direction 
sud sud ouest. Tout le temps sur la lave vol- 
canique. Le ravin du ruisseau ou l’on campe 
est semblable a celui du Cineguilla pres de 
Santa Fe. 
13 Janvier.—Du No. 39' au No. 40'.—On 
fait 13 milles f au sud ouest; on suit d’abord 
un canon de la veille jusqu’a sa fin, au sud est. 
Lave tout le temps. Puis on traverse une 
plaine, mesa, corverte de lave et laissant voir, 
dans differents endroits, le calcaire blanc gris- 
atre du carbonifere ? Le Picacbo mont est au 
nord, et parait etre du granite. Notre Camp 
No. 40' est sur le gres carbonifere. Les couches 
plongent au nord. Pas de dilvium. 
16 Janvier. —Nous avons change le camp, 
a un mille au sud ouest de No. 40', et nous som- 
rnes sur le granite ou gneiss, avec du red 
sandstone carbonifere au sommet. La direc¬ 
tion de la dislocation se voit tres-bien; est sud 
est au nord ouest. 
19 Janvier.—Du Camp No. 41' auNo. 42'.— 
On fait 7 milles |, orage tres severe de neige. 
Nous campons au pied d’une mesa de calcaire 
carbonifere; les couches plongent au nord. 
Une vallee large de huit milles nous separe 
d’une mesa a l’est. Diluvium dans le ruisseau 
du Picacbo, forme de roche granitique vol- 
canique et gneiss et calcaire carbonifere assez 
petits boulders. 
20 Janvier.—Du No. 42' au No. 43'.—On 
fait 9 milles en zig-zag. Dans le calcaire car¬ 
bonifere au pied de la mesa, je vois des 
Crinoids et Productus dans un ruisseau. 
On campe 4 une ravine apres avoir passe 
located beds, dipping to the S.S. W. at an angle 
of from 60° to 80°. The strata are broken ; 
the general direction of the heads of the beds 
is W.W.N. We saw a great non-volcanic 
mountain in that direction, and about twenty 
miles from us. Towards Camp No. 97 the lava 
again covers the carboniferous sandstones, and 
the lava continues as far as Camp 97. These 
red carboniferous sandstones are schistose and 
are very hard, generally more hard than those 
of the New Red of the prairies. No diluvium. 
January 12.— From Camp No. 97 to No. 
98. —We travelled miles in a S.S.W. di¬ 
rection, all of the time upon the volcanic lava. 
The ravine of the brook, where we are en¬ 
camped, is similar to that of the Cineguilla, 
near Santa Fe. 
January 13.— From Camp No. 98 to No. 
99. —We travelled 13f miles to the S.E., fol¬ 
lowing first the canon of the valley near its 
end, at the S.E. We were constantly on lava. 
Then we crossed the plain (mesa) covered with 
lava, and in different places showing the greyish 
white limestone of the carboniferous formation. 
The Picacho mountain is on the north, and ap¬ 
pears to be of granite. Our Camp No. 99 is 
on the carboniferous sandstone, and the beds 
dip to the north. No diluvium. 
January 16.— From Camp No. 99 to No. 
100. —We have changed camp from No. 99 to 
one mile further towards the southwest, and are 
now upon the granite, or gneiss, with some red 
carboniferous sandstone at the summit. The 
direction of the dislocation is very well seen, 
and is northwest and southeast. 
January 19.— From Camp No. 100 to No. 
101. —We travelled seventeen and a half miles 
in a very severe snow-storm, and encamped at 
the foot of a mesa of carboniferous limestone ; 
the beds dip to the north. We are separated 
from the mesa on the east by a valley eight 
miles wide. The diluvium in Picacho brook 
is composed of volcanic and granitic rocks, 
gneiss and carboniferous limestone, the bould¬ 
ers being rather small. 
January 20.— From Camp No. 101 to No. 
102. —We travelled nine miles in a zig-zag 
course in the carboniferous limestone at the foot 
of the mesa. I saw Crinoids and some species 
of Productus in the brook. We camped at a 
