bt. johx.] PALAEOZOIC AREAS QUEBEC. 483 



certained, but from the appearance of the slopes, their soft shaly nature 

 may be inferred. The conglomerate seemed to he without fossils. The 

 occurrence of this deposit marks a prominent change in the relative 

 coarseness and degree of induration of the materials accumulated in this 

 quarter, though their derivation in hoth cases is, with our present meagre 

 information, involved in much obscurity. 



Upjier Quebec limestone. — The upper Quebec limestone shows almost 

 the same development in the three principal areas, and wherever it oc- 

 curs it is characterized by a fossd fauna, whose species are represented 

 by an abundance of individuals. The Mount Putnam ridge, at Station 

 II, is capped by this member, where it shows a thickness of perhaps 

 200 feet. The rock consists of generally thin-bedded, fragmentary, 

 sometimes brecciated limestone, in color gray, grayish-buff, and pinkish 

 tinged, with buff indurated or shaly partings, certain layers being 

 charged with the disjointed or fragmentary remains of small-sized Tri- 

 lobites and a little Gasteropod resembling Rapltistoma. 



In the west flank of the Teton Range, wherever the series is exposed, 

 this horizon takes a prominent place in the stratigraphy of the magnifi- 

 cent sections here displayed. Its mural exposures, showing an exposed 

 thickness of 100 feet or more, are traced for miles in the canon walls 

 and as outliers in the Alpine region of the mountains. The peculiar 

 brown color of the weathered exposures, as well as the even-bedded 

 structure of the deposit, resemble those features of the inferior ledge. 

 In West Teton Creek Canon the main portion of the rock consists of 

 dark bluish and bluish-drab, even and thin-bedded, sometimes shaly, 

 more or less pure limestone, in places mottled with dirty -yellow spots, 

 the exposed surfaces of the layers presenting the peculiar rough- 

 weathered appearance so commonly associated with this rock. Above 

 the rock seems to pass through a gradation of thin shaly layers into the 

 overlying shales, this portion of the exposure usually presenting a rusty 

 yellow appearance. In debris at the mouth of the canon, probably de- 

 rived from this horizon, a few fragments of Trilobites were found. 



On the western flank of the Gros Ventre Range, south of the Little 

 Gros Ventre, these strata are raised up on the mountain, and also appear 

 in mural exposures at various points in the higher interior portion of the 

 range. It is here a drab, thin-bedded limestone, the exposed bedding 

 surfaces roughly weathered, the escarpment exposures showing the 

 characteristic dark rusty, even-bedded outcrop, and a thickness of 100 

 feet or more. The rock is traversed by thin seams of calc-spar, giving 

 it a mottled appearance, and breaks into small fragments under the 

 hammer. 



To the northeastward the horizon becomes much attenuated, as shown 

 in its outcrop at Station XLIX, in the vicinity of Buffalo Fork Peak. 

 At the latter locality the bed is made up of drab, buff-mottled, shaly, or 

 thin-bedded fragmentary limestone, exposed thickness 50 to 75 feet, and 

 contains the broken parts of Trilobites and other fossils. Of the isolated 

 remnant preserved in the Upper Gros Ventre Butte, and which may 

 properly be referred to the Teton area, I can add nothing from personal 

 examination to the mention it received from Professor Bradley. 



The Quebec-Niagara beds of passage. — The horizon of the beds of pas- 

 sage between the Upper Quebec limestone and the next succeeding 

 limestone above, offers most interesting phenomena of the varied physi- 

 ca 1 conditions prevalent dining this epoch within the limits of the present 

 district. So far as our present knowledge extends, it is difficult to assign 

 to the time conditions productive of particular or normal results, so dif- 

 ferent were the materials deposited at this time in different portions of 



