RESUMfi AND FIELD NOTES. 
139 
disparu a moitie chemin. Pas d’alluvion in 
diluvium. 
24 Septembre.—Die No. 51 cm No. 52.—On 
est constamment sur Pupper Trias. A moitie 
chemin, a notre droite, on a une montagne 
conique, large, le sommet est Jurassique, ainsi 
que celui de plusieurs montagnes que l’on voit 
plus loin a droite. 
26 Septembre. — Du No. 52 au No. 53.—On 
a au sommet d’un plateau que Ton treverse a 
2 milles du Camp le calcaire hlanc grisatre, a 
structure noduleuse du Llano ; qui doit etre 
Jurassique ; en suite on est constamment sur 
1’upper Trias, gres rouge et argile rouge ; dans 
la vallee du Gallinas river, on trouve, pour la 
premiere fois le diluvium des Rocky Moun¬ 
tains un granite rose, quartz hlanc et trap noir 
verdatre, ce dernier en abondance et gros du 
poing a la tete tres-roule. Entre Gallinas et 
Rio Pecos on a plus de diluvium des petites 
collines, et 1’on voit a notre droite de hautes 
collines a tables, dont le sommet doit etre Ju¬ 
rassique, par la couleur des roches. Ce Juras¬ 
sique parait s’etendre plus au nord qu’au sud 
de nous. 
27 Septembre. — No. 53.—Dans le diluvium 
du Rio Pecos, on a de la dolomie erratique et 
du gypse, on trouve cela a 5 milles en remont¬ 
ant de puis Anton Chico. Anton Chico est 
situe dans un bassin du red marl du Trias avec 
diluvium et alluvion sableux. 
28 Septembre.—Du No. 53' au No. 54'.—On 
monte les assises de l’upper Trias 500 pieds, 
puis on entre sur un plateau ou il y a le canon 
Blanco, dans le gres blanc Jurassique. A 
l’ouest des cliffs perpendiculaires de 800 a 
1,000 pieds montrant une belle section de 
l’upper Trias et du lower Jurassique. En mon- 
tant des deux formations il y a une dolomie 
marneuse etsableuse. Dansle gres Jurassique 
blanc, il y a souvent intercallees des assises 
marneuses d’un gres blanc; quelques couches 
de gres calcaire jaune, moins qii a Pyramide 
mont; au sommet du cliff on n’a pas encore la 
formed entirely of Trias ; the white and yellow 
Jurassic sandstone disappeared at half-way. 
No alluvium or diluvium. 
September 24.— From Camp No. 51 to Camp 
No. 52.—We are constantly on the upper 
Trias. About half way, on our right, we saw 
a large conical mountain, the summit of which 
is Jurassic, as well as those of several mount¬ 
ains which are visible further to the right. 
September 26. —From Camp No. 52 to Camp 
No. 53.—At the summit of a plateau which 
we crossed, two miles from the camp, we found 
greyish-white limestone with the nodular struc¬ 
ture of the Llano, which must be Jurassic. 
Afterwards we are constantly upon the upper 
Trias; red sandstone and red clays. In the 
valley of the Gallinas river we find, for the 
first time, the diluvium of the Rocky mount¬ 
ains, consisting of much rolled masses of a rose- 
colored granite, white quartz, and greenish- 
black trap ; the latter in abundance, and from 
the size of the fist to that of the head. Be¬ 
tween Gallinas river and the Rio Pecos we find 
more diluvium, forming little hills, and we see 
on our right high hills, forming table-lands, 
the summit of which must be Jurassic, judg¬ 
ing from the color of the rocks. This Jurassic 
appears to extend more to the north than south¬ 
ward from us. 
September 27.—In the diluvium of Rio Pecos 
we find some erratic dolomite and gypsum, five 
miles above Anton Chico. This place is situ¬ 
ated in a basin of red marl of Triassic age, 
with sandy alluvium and diluvium. 
September 28.— From Camp No. 53' to Camp 
No. 54'. 1 —We ascended the beds of the upper 
Trias five hundred feet, and again find a 
plateau -where cut by Canon Blanco in the 
white Jurassic sandstone. At Cuesta, perpen¬ 
dicular cliffs of 800 to 1,000 feet high exhibit 
a beautiful section of the upper Trias and lower 
Jurassic. On ascending these formations, 
there is a sandy and marly dolomite. In the 
white Jurassic sandstone, there are often in¬ 
tercalations of greyish-white marly beds ; 
sometimes of beds of yellow calcareous sand¬ 
stone less than at Pyramid mountain. At the 
1 From this point, the numbers of the camps do not agree with those of Lieutenant Whipple’s train which took the 
aroou travelled towards Santa F£. 
