Geology and Mineralogy. 65 
and woodland nymphs. On either side the sylvan walls look 
impenetrable, and for the most part so thickly is the ground 
matter as forcing an adattis. The tall spruces (Abies subalpina) 
stand so close together, that even if the dead-wood were not there 
so the Engelmann spruc d great mountain firs (A. Engel- 
mannii, A. grandis), which are delightfully varied, graceful in 
orm, and rich in foliage. Rarely are these species found in such 
luxuriance and so variable in habit. In places where t ey are 
much exposed to the keen blasts of this altitude they do not grow 
into tall, majestic spires, but cower into the form of large bushes, 
von nee branchlets thatched tightly together like a great hay- 
rick, 
hese H h 
southern boundary of Utab, the parallel of 37°, Beyond, lies the 
Plateau country, described by Powell, the region of the Shiwits, 
Uinkaret, Kanab, Kaibab and Paria plateaus, on the north side of 
the “Grand Cafion” of the Colorado,—which here extends nearly 
east and west between the parallels of 36° and 36° 30’,—and of 
“Marble Cafion,” “Kanab Cafion,” “Hurricane Cli 8,” ‘* Echo 
Cliffs,” and other remarkable features.* 
he Henry Mountains, described by G. K. Gilbert, stand 30 
miles to the east of the Aquarius plateau. 
In the geological account of these plateaus the author treats of 
ster ah, at the eastern base of the Awapa and 
Aquarius plateaus, and with it the Jurassic, and the latter also 
outcroppin narrow strips in the r River Valley; the 
* See Powell’s Report on the Uinta Mountains; also this Journal, III, xii, 420, 
and Dana’s Manual of Geology, edition of 1880, page 792. 
Am. Jour, ere Series, Vou. XX, No, 115.—Juxy, 1880. 
