CAEBQNIFEROUS UNDIVIDED. 377 



About 300 feet from the summit of the series are some extremely dark beds, which emit a 

 fetid odor upon being struck with a hammer and are intercalated with very impure arenaceous 

 limestones. * * * 



The limestones at 1,000 feet from the top inclose a series of thinly bedded but heavily 

 blocked quartzites, which contain two or three sheets of small pebbles. These, however, are 

 very thin and localized. The quartzite is more properly indurated sandstone and occupies a 

 belt 150 feet thick. In general, the upper 1,000 or 1,500 feet of this limestone series are made 

 up of thinly bedded rocks, less pure than the strata below and more or less intercalated with 

 sihceous zones. Some of the beds are also considerably argillaceous. 



The closing members of the Wahsatch group are arenaceous limestone with a briUiant 

 brick color. 



The passage from the Wahsatch hmestone into the Weber quartzite is made in perfect 

 conformity and, as the beds clearly evidence, with undisturbed consecutive deposition. Above 

 the reddened and arenaceous summit of the Wahsatch Hmestone are a few intercalations of 

 sihceous limestone. * * * j^ this lower zone are sheets of conglomerate, the pebbles of 

 which are usually small and composed of white quartz. The general appearance of the quartzite 

 zone is here that of a coarse, rather gritty sandstone, unevenly compressed into quartzite. The 

 bottom of the series is prevailingly red for about 250 feet and averages coarser than the mate- 

 rial above. Over the red is a very finely laminated white and grayish quartzite, quite uniform 

 in texture and with only the most sparing inclosures of pebbles. * * * ^ mile and a haK 

 east from the base of the series there is scarcely any conglomerate at all, and the rock is true 

 quartzite of whitish or greenish hue, developing on many of its weathered surfaces a pecuUar 

 dark brown stain which looks like the oxidation of manganese. * * * Conformably over- 

 lying the quartzite is a very heavy bed of much altered gray Hmestone from 600 to 700 feet 

 thick. The bedding planes are often entirely obHterated and the material extremely crystal- 

 line, showing traces of great interior disturbance. The lower beds show a true conformity with 

 the underlying quartzite. * * * -pjjg average colors of these Hmestones are cream-grays, 

 inclining often to white in the more crystalline portions. * * * Overlying this main body 

 of 700 feet of Hmestone is a series of yeUow shaly Hmestones 175 feet thick. * * * Over- 

 lying these calcareous shales, as heretofore quite conformable, is a series of sand and mud rocks, 

 all more or less calcareous, varying in color from chocolate to olive, with red argiUaceous sand- 

 stones, the whole about 225 feet tliick. It has the appearance of a comparatively shaUow 

 water deposit, made of argillaceous material, Hmestone, and sand, the thickness of the indi- 

 vidual beds being unusually limited. There are very many beds not over an inch thick. On 

 the upper surface of the strata, at several horizons, ripple marks are preserved with unusual 

 distinctness and on a scale of fineness not often seen, the distance between the wave and the 

 trough being frequently not over an inch or an inch and a half. Alternating dark chocolate 

 and oHve-colored shales form the lower 200 feet of this group, while the upper 25 or 30 feet are 

 pretty soHd sandstone. Over these, still conformable, are 100 feet of yeUow and oHve calcare- 

 ous shales, which are so earthy as usually to decompose, jdelding a bad outcrop. Above this 

 is a bed of bluish-gray limestone, rather compact, about 150 feet in thickness. Next comes 20 

 feet of reddish-brown clayey sand, hardly compacted into rock, containing thin stony seams 

 intercalated at intervals in the soft, easity eroded matter. This is immediately followed by 75 

 feet of a yeUowish-gray, brittle, easily decomposed hmestone. Next above are 100 feet of 

 Hght-colored, very thinly bedded Hmestones, that give way to 100, feet more of dark, sihceous, 

 tough Hmestone, which breaks under the hammer with great difficulty, yielding an exceedingly 

 rough, ragged fracture. 



This section comprises both Mississippian and Pennsylvanian rocks. Weeks, *^^* 

 describing the Uinta sections, says : 



Wherever fossils have been found in the lower and upper members of the Wasatch limestone, 

 they show the former to be of Mississippian age and the latter of Pennsylvanian age. This is 

 also true of the Uinta Range. The precise line of division has not yet been determined. In 



