TO YELLOWSTONE NATIONAL PARK. 129 
Fig. 14. 
Frigg aw 
Little Rocky Mountains. <a 
Trachyfle. e 
es 
4, 
OMY, 
110 
in aye wort nt 
N WwW ; 
Limestone. 
CTT sna” 
CTTERUT ARS aR 
Grassy meadow. 
é: 
y 
2 
S 
< 
v 
3 
Sa ndstone.% g a 
2 $ 
‘ 
€M . 
iio 
Shales with 
concretions. g NN 
2 2>——— 
ervey, 
is See yy RERUN 
ea ===" Sandstone. 
At the west end of this limestone wall, a little cafion opens out, showing the considerable thick- 
ness of the limestone. Lower layers afforded the following fossils, of which a list is here given, with 
remarks made upon them by Mr. Whitfield : 
1. Glauconome, sp.?.— Too indistinct for specific determination.” 
2. Productus, sp. ?.—“ This has a feature (elongated depressions) which is seldom seen in rocks above 
the Chemung of New York or Waverly sandstone of Burlington, Iowa.” 
3. Chonetes, sp.?.—Resembles C. granulifera, Owen; also very like C. subumbona, M. & W. 
4, Chonetes, sp.— This may possibly be only a variety of the preceding, with which it was associated ; 
but had I seen only this fossil, I should have thought it Lower Silurian.” 
5. Spirifera centronata, Winch. 
In regard to these fossils, Mr. Whitfield says: 
“The general expression of these fossils is that of Lower Carboniferous or perhaps Waverly. 
The locality and formation is worth further exploration in view of the rocks being Lower Carbon- 
iferous, or possibly even lower.” 
We ascended the hill at d with some little labor, owing to the thick growth of scrub-pines, with 
which it was covered, and from it obtained a tine view of the surrounding prairie and the desert 
country far to the west. The various ranges of hills were distinctly visible: the Judith Mountains 
with Cone Butte, to the south fifty miles distant in an air-line; the Moccasin Mountains; Bear’s Paw 
Mountains, and so on. The height of this hill was 3,500 feet above Carroll, or 2,000 feet above the 
surrounding prairie. Of the general geology of these hills, little can be said from such a survey, 
except so far as the wide extrusion of the trachyte was noted. The hill in question was made up 
of the trachyte which had been found in such large quantities over the prairie to the south. This 
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