GEOLOGICAL SURVEY OF THE TERRITORIES. 443 



ing section, tbis fault and local displacement of tbe lower beds of the 

 same, observed here at Coalville, because the fracture runs so nearly 

 parallel to the section that it could not be done. 



At one place on the southeastern side of the first ridge, almost ex- 

 actly 'at the point where the fault already mentioned crosses, some coal 

 was found in a drift excavated into the side of tbe hill, i)erhaps 80 to 90 

 feet above the borizon of Weber Valley. As this coal, however, was 

 soon found to end abruptly, on following it in, it is probably only a de- 

 tached portion of the main bed, (5,) thrown that far out of its natural 

 position with relation to the other strata, by the fault cutting through 

 the whole. As suggested by Mr. Emmons, however, it could certainly 

 be found again at a lower position on the same side of tbe ridge, pro- 

 vided the search should be made, on tbe northeastern side of tbe line of 

 fracture. Its position, however, on the other side of the fault, would 

 be on the opposite or northwestern side of tbe ridge, since that end of 

 the ridge is comi)osed of beds really belonging below the horizon of this 

 coal. It is probable, however, that if bodies of this coal exist on the 

 northwest side of tbis ridge, near the line of fracture, tbey would be 

 found so much broken up and distorted as to be of little practical 

 value. 



Some facts observed at tbe locality gave origin to tbe suspicion that 

 possibly the wbole of that portion of the first ridge on tbe northeastern 

 side of the fault may really be only a down-thrown part of tbe second 

 ridge, or even that both this and the second ridges might be down- 

 throws of the third; though the subordinate beds composing these 

 ridges do not seem to correspond closely enough to warrant tbis conclu- 

 sion. 



The fault, or lateral displacement, mentioned in tbe first ridge, is also 

 strikingly manifest in the second ; the lateral movement tbere being 

 more than 100 feet, precisely as if tbe whole ridge had been cut across 

 by a gigantic saw, and tbe strata on the southwest side of tbis division 

 slipped that far to tbe northwestward, or tbe portion on tbe northeast 

 side as far southeastward. Evidences of this fracture are to be seen in 

 tbe other ridges, and I have no doubt that it cuts tbrough the whole 

 to Echo Caiion, and possibly far beyond in a north or northwesterly 

 direction, not exactly but more or less nearly at right angles to the trend 

 of the ridges and strike of the strata.* 



Divisions 14, 10, 10, and 17 were not seen well exposed on tbe line of 

 tbe section, or even on the east side of Weber Eiver, though tbey are 

 doubtless exposed at some localities on that side. On tbe west side of 

 the river, however, at Mr. Carleton's coal-mine, about two miles in a 

 southwesterly direction from Coalville, and at a higher elevation, these 

 beds were cut tbrough by a drift excavated into tbe side of tbe hill 

 horizontally, nearly in tbe direction of the dip, which is tbere to the 

 northwestward about 20° below the horizon. Coal, however, has been 

 found at, or very nearly at, this horizon on the east side of the river ; 

 while the great massive sandstone composing division 18 forms a pre- 

 cipitous escarpment above Mr. Carleton's mine, and tbence extends con- 

 tinuously, in a northeasterly direction, to Weber liiver,.at a point nearly 

 opposite the third ridge on the east side, thus leaving little room to 

 doubt tbat Carleton's coal and the associated beds occupy the position 

 assigned tbem in tbe section tbere, as they do on the west side of tbe 

 river. 



*Otber similar faults, or later displacements, were also seen iu the ridges at other 

 points a mile or so farther eastward. 



