GEOLOGICAL SURVEY OF THE TERRITORIES. 443 



ing section, this fault and local displacemeut of the 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 the hill, perhaps 80 to 90 

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

 soon fouud 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 

 ]>osition 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 the ridge, pro- 

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

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

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

 the ridge is composed 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 this ridge, near the line of fracture, they would be 

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

 value. 



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

 possibly the whole of that portion of the first ridge on the northeastern 

 side of the fault may really be only a down-thrown part of the 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 this conclu- 

 sion. 



The fault, or lateral displacemeut, mentioned in the first ridge, is also 

 strikingly manifest in the second ; the lateral movement there being 

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

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

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

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

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

 to Echo Canon, 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, 15, 16,. and 17 were not seen well exposed on tie line of 

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

 doubtless exposed at some localities on that side. On the 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 through by a drift excavated into the side of tbe hill 

 horizontally, nearly in the direction of the dip, which is there 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 masvSive sandstone composing division 18 forms a jjre- 

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

 tinuously, in a northeasterly direction, to Weber liiver, at a i)oiut nearly 

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

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

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

 liver. 



*Other similar faults, or later disijlacements, were altso seeu iu the ridges at other 

 points a mile or so fartlier eastward. 



