164 GEOLOGICAL SURVEY OF THE TERRITOEIES. 



three pretty-well defined steps of about 90, 140, and 80 feet respectively, 

 to a stream, on the opposite side of which is a low- terraced treeless 

 park, about three miles broad, rising in rounded sloi)es to a ridge capped 

 with a broken paliisade beyond. 



.On the left (southwest) the terraces abut against and run out from a 

 hill which looks off in the same valley, and on its northern sides lie the 

 same sandstones, dipping northwestward at an agle of 35° with the bed 

 of dolerite lava on their top just as before. See section E, Fig. 10 and Fig. 

 11. Low terraces abut against the lava and run out occupying the valley 

 basin beneath which, however, as we will see later, lie the Cretaceous 

 shales. The hill and region lying south of B was not personally ex- 

 amined, and, while the sandstones may mantle over it, it is apparently 

 of granitic rocks as indicated on the map. On the right, also," and a 

 few miles in an opposite direction to E, similar beds may be seen like- 

 wise dipping westward beneath the main valley. 



Eeturning to the Grand Lake road and following it northward, it is 

 found to pass over into the head of another valley leading down to near 

 the mouth of the Frazier Canon. On the right (east) is the ridge formed 

 by the edges of the sandstones resting on granite below, and dipping 

 down underneath the trail. Near the Frazier these edges overhang 

 the caiion and form the top of its western wall. Beneath the valley 

 through which the road passes, however, the beds are flexed, forming a 

 synclinal of the valley and an anticlinal of the ridge just west of it, (see 

 section 1, or A B,) the western slope of which, just as at E, dipping 

 westward beneath the terraced valley. The mouth of the Frazier Canon 

 is through the ridge of upturned sandstones, after which the valley opens 

 some vv hat, with terraced lake-beds before entering the main valley. 

 The exposure upon the west side of the canon gave the following section 

 (at B, section 1, Plate III.) 



Section of No. 1 Cretaceous at tlie mouth of the Frazier Canon. 



Nature of strata. 



Thick- 

 ness. 



I 



Covered hill-slope, inclining v/est, facing east, clipping west into hill 15°, very 

 compact, hard siliceous sandstone, mostly white, gritty 



Covered debris of brown sandstone, and compact blue-gray limestone 



Sandstones, reddish, thin-bedded, some shales 



Corupact gray-blue limestone, somewhat cherty, blotched 



Sandstones, in 2 to 5 feet beds, white to yellow pink shales 



Covered, debris of snufi'-colored and rusty brow u sandstone 



Gray, rather granular granite, with but little micii, containing very large scat- 

 tered crystal of feldspar to river. 



Feet. 



40 

 80 

 25 



2 

 30 



85 



These beds are probably liable to considerable local changes, both in 

 characters and thicknesses. They are probably the same as a portion of 

 the lower beds of the preceding section, the higher ones having been 

 here swept away by erosion, and being found west. Crossing the Fra- 

 zier northward, station LYIII is found upon a hill of the siliceous 

 sandstones. Its surface has a gentle eastward slope, the sandstones 

 dipping also east, but curving up again they are found lying as usual 

 on the granites, thus forming a little synclinal. The upturned edges of 

 these sandstones are leveled off in a peculiar way, being evened off 

 with the granites behind them. (See section near B.) The west side of 



