RESUMfi AND FIELD NOTES. 
149 
Du sommet d’Inscription Rock je vois au 
sucl est, un volcan et deux ou trois cones secon- 
daires; le grand volcan a 10,000 pieds de 
hauteur et est isole. 
and yellow and rose-colored Jurassic sand¬ 
stone, which forms a table-cliff facing the east, 
and of which Inscription Rock is a part. From 
the summit of Inscription Rock, I see in the 
southeast a volcano, and two or three secondary 
cones. The great volcano is 10,000 feet in 
height, and is isolated. The following is the 
section from Camp 67 to Camp 68. 
10 Novembre.—Du No. 9' an No. 10', ou Ojo 
Pescado springs. —On traverse la coulee de 
lave en sortant du camp ; puis une colline de 
sandstone rose et d’argile grisatre a la base 
Jurassique.- Puis le chemin retraverse de 
nouveau sur la lave jusqu’aux [ruines ?) ou 
Camp No. 10, ou la coulee de lave parait ter 
miner. Les cliffs de canon a droite et a ganche 
sont couronnes par un gres rose tres-fin, vin- 
ace a stratification tres-epaisse de 15 a 40 
pieds ; et la base des cliffs jusqu’au | est formee 
d’argiles schisteuses gris noiratre ; avec inter¬ 
calation de couches de calcaires jaune de trois 
pieds d’epaisseur et plusieurs assises de marnes 
sont si noires, qu’elles deviennent bitumineuses 
et ont des assises de houille, d’un demi a un pied 
d’epaisseur. Les assises Jurassiques inclinent 
a l’ouest sous un angle de 8 a 10 degres. Les 
sommets des canons sont des Mesas. Pas de 
diluvium. 
20 Novembre.—Du No. 10' au No. 11'.—On 
suit le canon qui part d’Inscription rock. La 
lave est beaucoup reduite de dimension ; mais 
occupe tout le temps le fond du bassin jusqu’au 
Camp 11 ou il se termine a 30 yards plus a 
l’ouest du Camp 11. On arrive a un resserre- 
ment du cahoD avant d’arriver dans la vallee 
de Zuni proprement dite ; et alors le Jurassique 
disparait, excepte sur quelques sommets. Le 
Trias est tres-developpe, surtout les gres rou¬ 
ges ; quelque assises hanches et grises sur le 
sommet; le fond de la vallee entierement rose 
ou rouge lie de vin. Le Trias inclinant a 
Test sous un angle de 10 a 15 ; et la vallee de 
Zuni est un ecaillement longitudinal parallcle 
November 19.— From Camp No. 68 to Camp 
No. 69, or Ojo Pescado springs. —We crossed 
the coulee of lava on going out from the camp, 
then a hill of rose-colored sandstone and grey 
clay, at the base of the Jurassic ; then the road 
again crosses the lava near to the [ruins ?] or 
Camp No. 69, where the stream of lava ap¬ 
pears to terminate. The cliffs of the canon on 
the right and on the left are crowned by a very 
fine rose-colored, micaceous sandstone, very 
thickly bedded, from fifteen to forty feet thick ; 
and the base of the cliffs, or three-fourths of the 
height, is formed of blackish-grey clay shales, 
with intercalations of beds of yellow limestone 
three feet thick; and several beds of marls are 
very black and become bituminous, and also 
contain layers of coal from six inches to one 
foot in thickness. The Jurassic strata incline 
to the west under an angle of eight to ten de¬ 
grees ; the tops of the canons are plains or 
mesas. No diluvium. 
November 20.— From Camp No. 69 to Camp 
No. 70.—We followed the canon which com¬ 
mences at Inscription Rock. The lava is much 
reduced in its dimensions, but occupies all the 
bottom of the basin as far as Camp No. 70, 
where it terminates only thirty yards beyond. 
We reached a contracted part of the canon be¬ 
fore arriving at the valley of Zufli, properly so 
called, and then the Jurassic disappears, ex¬ 
cept upon some summits. The Trias is very 
well developed, especially the red sandstones ; 
some grey and white strata towards the sum¬ 
mit. The bottom of the valley is entirely rose 
or wine-colored. This Trias inclines towards 
the east at an angle of from ten to fifteen de- 
