TRIASSIC. - MARLS AND SANDSTONES. 79 
Varieguted Marts. 
si Light orange tit te ee ee we SS og ee Sr re wry ce ee oP eee 2 a ee er Lg 15 feet. 
2. Green and purple magnesian limestone, containing worm-like concretions of 
calcareous SPAL cee eee sees cewcee ceases sceces severe wsss weeees sseens 5 feet. 
8. Pinkish purple iitite EWM ee ck se pia es ee wrk ft CEE oe ea ee Pee 22 feet. 
4. Brown shelly WANGGLOUG. <3 So wes 69k ove Wie 6 ale COs oe Be bee cu eke Rhewek 8 inches. 
5. Purple TOBCE WICC SUC WOO § co 55 ¢ aiés as eab es Vode sta cae wees Oba 16 feet. 
6. Purplish green cherty magnesian limestone, in several layers, alternating with 
BAUS Gl TAATE es nodes CRO AS POW Cee Ci ee be ote be ets Kies des es 3 8 feet. 
1, Purple and Cream-colored Tints: 1S aes Fee Se et ea Seat CC cee 30 feet. 
8. Greenish magnesian limestone, in thin layers, with bands of marl.----.---. 12 feet. 
9. Yellow, red, and purple marls.----- +++ eee ee cece eee eee eee ee ees 40 feet. 
10. Green limestone, ATTIC ac es ee ee a Ce we Che 6b Se be eso ee aoe 8 feet. 
11. Red, purple, pink, green, lilac, brown, and blue marls, with silicified wood-- 350 feet. 
Red Sandstone Series. 
Pa = CFPOOTIAN TOHATOU BATIIONO <6 sa ers ae ve ee vecnss oseecnsies (ose Se te vm 920 feet. 
13. Purple shales with some silicified wood «-+++++s+eeee eeeeee cece ee eeeees 50 feet. 
74. Hedl sandstone and shale «<< + os sess ode ed eewe.e RESET EE FRAP TER EG 2 45 feet. 
15. Conglomerate ba Wer hs Cas 6 4 a leW Ede aCe eb are eas ee ak ka ok 26 feet. 
16. Dark red laminated sandstone, from which issue salt springs, to base. 
It will be noticed that in the above section the lower portion of the rina marls contain 
no bands of magnesian limestone ; they are, however, here but locally wanting. <A few miles 
west of Cottonwood Fork there are at least six bands of dolomite in the first three hundred 
feet of the variegated marls. These marls in this vicinity have so little consistence that they 
have been even more effected by the action of water, and more extensively and strangely 
eroded, than are the red sandstones which underlie them. 
In our ascent of the mesa between Camps 89 and 90 the trail we followed led through a 
labyrinth of hills of all conceivable forms and sizes, which had been shaped by the erosion of 
the lower portion of the marl series. The colors of the strata are as vivid as would ever be 
used in the construction of a geological diagram, and the scenery formed by the combination 
of these brilliant and varied colors, with outlines quite as unusual in natural objects, produced 
a picture as unlike those presented by most portions of the earth’s surface as could well be 
imagined. 
In the denudation of the marls immense quantities of silicified wood have been brought to 
light. Fragments of all sizes are thickly strewed over the low lands, and have accumulated in 
piles of many hundred cords at the bottom of some of the slopes, where they have precisely the 
appearance of so much drift wood. These fossil trees are apparently all coniferous, though 
belonging to several species and probably representing more than one genus. From the diffi- 
culty of having specimens properly sliced for the microscope they have not yet been critically 
examined. They exhibit considerable variety in their mode of preservation, but frequently 
retain, in great beauty and perfection, the details of their anatomical structure. Some of the 
trunks are converted into red jasper, and look like huge masses of red sealingwax. Others are 
composed of agate or opalescent chalcedony, often showing a variety of bright colors and form- 
ing beautiful specimens for the cabinet. As generally found, these silicified trunks are broken 
faite pieces from one to six feet in length, as though they had been sawed through transversely. 
These pieces have usually been separated from their fellows and lie scattered about in the 
greatest confusion, but where the marls containing them have been horizontally wooded I found © 
