260 Scientific Intelligence. 
same kind as that of the Arkansas marls, and cotemporaneous 
with i 
Along this creek there are some massive walls of this formation, 
mostly yellow marls, but some layers of sandstone. This ridge 
extends from the mountains far northward, and is about two miles 
wide ; and between it and the immediate base of the mountains is 
etnaied a beautiful valley of considerable w 
The Middle Par 
Viewed Fecal Middle Park, hang s aks and the range imme- 
diately connected with, has a rugged, saw-like edge, as if com- 
posed of eruptive rocks, and iiige after aa inclines aie it in reg- 
ular order. 
About ten miles north of our camp, in the first park, we come 
to low ridges of massive red feldspathic granite, and parallel 
the true nature of the unde aoe rocks is not easily pein 
aia comes ridge after ridge, untill all the beds—jurassic and cre- 
aceous—are e shown 
t. 
s stream we have a fine system of terraces. On the 
north dide are three Aletinat terraces above the bottom, and the 
er one has a bed of creta aceous 8 sag ai sani horizontal, 
eee out at its base. is is a low one, not more than 
feet high ; the next one is fifty feet high, as the third, which ae 
scends from the high hills, is two hundred feet. <A little west * 
dir 
peaks, and the ‘beds whieh rie the mee of upheaval inclining in 
every 
To the sone of the park, the older poor pia dip north 
in lofty ridges, at least two thousaudl feet high, p hi 
RR when split by streams, and reaching Spa the high 
of the mountains. 
brough an enormous gorge cut Ble a high “age of 
U: 
shales umbers 4 and 5, and above 
beds. Theee beds all dip west 2 23°. 
rough, as if they had been 
uch of it is a very coarse conglom 
sppdariig 00.00 the Lame kind ss? 
