128 
GEOLOGICAL REPORT-THIRTY-FIFTH PARALLEL. 
d’abord la plaine avec sandstone et sables, j 
pres du pied du Delaware mont on a des cal- 
caires tres developpes qui forment presque 
en entier la montage avec quelques alterna¬ 
tions de gres. Les calcs disloques; ils plongent 
au nord. Pres du Camp No. 19 apparait une 
mountain limestone on lower carboniferous; on 
trouve dedans des tiges de Crinoids, et au 
camp je trouve une couclie sablo-siliceuse de 4 
ou 5 pouces d’epaisseur qui est remplie de Sep- 
taria, Terebratula et un Polypier. Couleur gris 
blanchatre, dure, a cassure sub-conclioidale, 
bien strafiee, se desagregeant facilement a Pair. 
L’alluvion est moins sableuse et le lit des tor¬ 
rents est rempli de fragments calcaires de la 
grosseur d’une noisette a celle de la tete. 
Direction du Delaware mountain sud sud ouest 
ou 30° a P ouest au nord nord est. 
16 Aout.—Du No. 19 au No. 20,—On passe 
constamment des collines de limestone et 
quelque couches de sandstone le tout d’une 
epaisseur de 5 a 600 pieds, avec peu ou pas de 
fossiles, car je ne puis en voir ; a moitie cbemin, 
on passe pres d’un creek ou il y a un pou- 
dingue calcaire, espece de naglejlue forme des 
debris des roclies environnantes. On remarque 
un sandstone carbonifere a grain assez grossier 
et facilement decomposable; un creek a 5 milles 
avant le camp en est rempli exclusivement. 
Au Camp No. 19 on a des argiles rouges et 
bleues assez dures avec sandstone brechiforme 
et quelques fragments de dolomie-; 
[?] qui indiquent que les gypses ne sont pas 
loin de nous. 
17 Aout.—Du No. 20 au No. 21.—On suit 
une plaine un peu ravinee et ou l’on ne voit 
que de l’argile blanche du superieur gypsum et 
une couche de gres, tres dure, a grains gros- 
siers, avec feldspath. L’alluvion est formee 
de cailloux de quartz de la grosseur d’un oeuf 
de pigeon. 
22 Aout.—Du No. 21 au No. 22.—On suit 
constamment l’argile rouge souvent remaniee 
de a 3 pieds a la partie superieure et alors 
melee de quelques cailloux de quartz roules, i 
gros comme le poing au-dessous de cet argile 
No. 19.—We at first followed the plain with 
sandstone and sands ; then arriving at the foot 
of Delaware mountain, we find limestones very 
well developed, of which the mountain is al¬ 
most wholly formed, with some alternations of 
sandstone. The limestone is upheaved, and 
at Camp No. 19, dips towards the north. It 
appears to be mountain limestone or lower car¬ 
boniferous ; it contains stalks of Crinoids , and 
at the Camp I found a bed of silicious sand 
four or five inches in thickness, which is filled 
with Septaria, Terebratulce, and a Polyp. The 
color of the limestone is whitish-grey ; it is 
very hard and breaks with a sub-conchoidal 
fracture ; is very regularly stratified and sepa¬ 
rates readily where exposed to the air. The 
alluvium is less sandy, and the beds of the tor¬ 
rents are filled with fragments of limestone, 
from the size of a nut to that of the head. 
The direction of Delaware mountain is S.S. 
W. (or 30 degrees west) to N.N.E. 
August 16.— From Camp No. 19 to Camp 
No. 20.—We constantly passed limestone hills, 
with some beds of sandstone, the whole series 
having a thickness of from 500 to 600 feet, but 
with few or no fossils, for none were seen. 
Half-way, we passed near a creek where there 
is a calcareous conglomerate, a species of nagle¬ 
jlue, formed from the wrecks of the surround¬ 
ing rocks. We met with a carboniferous sand¬ 
stone, coarse-grained, and easily decomposed ; 
a creek five miles distant from our camp is com¬ 
pletely filled with this rock. 
At the Camp No. 19, we found red and blue 
clays, pretty hard, with a brecciated sandstone. 
Some fragments of dolomite -; which 
indicate that the gypsum formation is not far 
from us. 
August 17.— From Camp No. 20 to Camp 
No. 21.—We followed a plain traversed by 
some creeks, and saw only w T hite clays above 
gypsum, and a bed of very hard sandstone, 
with coarse grains, and somewhat feldspathic. 
The alluvium is formed of quartz pebbles of 
the size of a pigeon’s egg. 
August 22.— From Camp No. 21 to Camp 
No. 22.—We constantly followed red clay, 
often reassorted or washed in the upper por¬ 
tions for two or three feet in depth, and then 
mixed with some rolled quartz pebbles as large 
