RESUMfi AND FIELD NOTES. 
145 
Pecos, des canons dans de Trias ; les soramets 
des canons etant du gres Jurassique. 
14 Octobre. —D’old Pecos a Pecos on voit 
sur la rivie gauche de la riviere les couches 
du Terrain carbonifere superieur, et nous cam¬ 
pons sur le terrain carbonifere inferieur. Pres 
du pont je trouve line quantite de fossiles, et 
la couche a Terebratula biplicata, a Productus 
giganteus et punctatus; Spirifer, Polypes, Cri- 
noids. 
On quitte le terrian, peu apres le camp, et le 
reste du chemin jusqu’au Camp F, est sur le 
trias ; le sommet du canon pres du camp est 
Jurassique, la partie inferieure etant tres ferru- 
gineuse, comme l’oolite ferrugineuse entre le 
gres blanc et le gres jaune. 
15 Octobre.—Du Camp F ou Camp G, ou 
Santa Fe. —Deux miles apres avoir quitte le 
camp, on quitte le Trias pour etre jusqu'a 
Santa Fe sur le granite et autres roches erup- 
tives. Ce granite est rose, et contient beau- 
coup de feldspath. 
16, 17, IS Octobre.—Du Camp G an Camp 
Ii, ou Galisteo rio. —On a le diluvium jusqu’a 
Cineguilla puis la les volcans couronnant et 
recouvrant le Trias et le Jurassique ; dans le 
vallee du rio Galisteo, on a le Jurassique su¬ 
perieur avec Lucina ou Cardium et des dykes 
de trap courrant nord 30 est. 
19 Octobre. — Du Camp H au Camp I .—On 
a le Jurassique, jusqu’au sortir du canon de 
Cuesta creek ou l’on voit le Trias, au dessous 
a San Felipe on a du cote de la riviere deux 
can etant derriere San Felipe un peu nord 
ouest. La lave s’etend de l’autre cote du rio 
Grande sans interruption tandisque de ce cote 
on ne l’a plus apres San Felipe ; les alluvions 
s’etendent sur les collines de marnes Juras¬ 
sique entre Cuesta et notre Camp I. 
20 Octobre.—Du Camp I a Albuquerque .— 
Vis-a-vis Alameda de l’autre cote du rio 
Grande, on a le Cretace sableux decomposant 
et une petite assise de red marl a decouvert; 
entre Alameda et Albuquerque sur le cote 
droit de la riviere on a de nouveau des laves 
volcaniques. Derriere Bernalillo on a dans 
l’alluvion une argile plastique rouge et jaune, 
19 t 
the Trias as far as old Pecos, the top of the 
: canons being of Jurassic sandstone. 
October 14.—We saw on the left bank of the 
river, between Old Pecos and Pecos, the beds 
of the superior carboniferous formation, and 
we encamped upon the inferior carboniferous. 
Near the bridge I found a quantity of fossils 
and a bed filled with Terebratula biplicata, 
Productus giganteus and punctatus, Spirifer, 
Polypi, and Crinoids. 
We leave the formation a short distance 
beyond camp, and the rest of the way, as far 
as Camp F, is on the Trias. The summit of 
the canon near the camp is Jurassic, and the 
inferior portion is very ferruginous, like the 
ferruginous oolite between the white and the 
yellow sandstone. 
October 15.— From Camp F to Camp G, or 
Santa Fe. —Two miles beyond camp we left the 
Trias, and, until near Santa Fe travelled on 
granite and other eruptive rocks. The granite 
is rose-colored, and contains abundance of 
feldspar. 
October 16, 17, and 18.— From Camp G to 
Camp H, on Galisteo river. —We find dilu¬ 
vium near to Cineguilla, then volcanoes 
covering the Trias and Jurassic rocks. In the 
valley of the Rio Galisteo we have the superior 
Jurassic, with Lucina or Cardium, and some 
trap-dykes running N. 30° E. 
October 19.— From Camp H to Camp I .— 
We found the Jurassic as far as the mouth of 
the canon of Cuesta creek, where we found the 
Trias ; below, on this side of the river, 
we find two small islands of Jurassic strata 
crowned with lava ; the volcano being be¬ 
hind San Felipe, a little northwest. The 
lava extends, without interruption, on the 
other side of the Rio Grande, while on this 
side it disappears after passing San Felipe. 
The alluvium extends on the hills of Jurassic 
marl, between Cuesta and Camp I. 
October 20.— From Camp I to Albuquerque .— 
Opposite Alameda, on the other side of the 
Rio Grande, we have the Cretaceous, sandy 
and decomposing, and a little layer of red marl 
is uncovered. Between Alameda and Albu¬ 
querque, on the right side of the river, we 
again find the volcano lavas. Behind Ber¬ 
nalillo we have a red and yellow plastic 
