Chap. IV. 
GEOLOGICAL REMARKS. 
249 
The strata of the latter, if I am not mistaken, are not 
parallel with those underlying it. 
I have no doubt that this upper sandstone belongs to 
the Jura formation pointed out by Marcou as occurring 
here. On the Ocate, a cleft running out into the valley 
of the Upper Canadian, this sandstone contains vegetable 
remains, consisting of indistinct twigs and dicotyledonous 
leaves. At the same time numerous little round eleva- 
tions of a white colour are seen upon the planes of separa- 
tion in the red or yellowish chief mass, which give the 
rock a spotted appearance and an oolithic character. 
Upon these strata of sandstone, which contain the beds 
of Rabbit's Ears Creek, Rock Creek, Whetstone Creek, 
and other creeks, and over which the trap-lavas of the 
Kabbit's Ears and the Round Mound have poured, there lie 
in the vicinity of Waggon Mound, on the plateau across 
which the road leads to Las Vegas, still higher strata of 
a limestone, now lighter, now darker, and of a very hard 
dark grey sandy marl-slate containing innumerable and 
here and there separate masses of calcareous spar. The 
trap-lavas of Waggon Mound have broken through and 
spread over these upper layers. 
At Las Vegas, on the north-east side of the valley, the 
limestone of the Jura formation terminates in nearly hori- 
zontal stratification, and on the opposite side of the valley a 
steep ridge of sandstone runs from N.N.W. to S.S.E. ; 
its strata, inclined E.N.E., passing under that limestone. 
Probably it is the new red sandstone uplifted from the 
west which reappears here. Through a narrow cleft which 
intersects this ridge to its base — so narrow that a loaded 
waggon can hardly pass between the rocks — the road to 
Santa-Fe leads on level ground into a labyrinth of irregular 
