ii8 WHITMAN CROSS 



Jurassic sandstone, and No. lo to the Vermilion Cliff sandstone. 

 Possibly No. ii contains the Shinarump conglomerate. If so, it 

 would appear that the Triassic portion of the Shinarump is repre- 

 sented by but ninty-two feet of beds at this point. On that basis 

 Newberry's section is in close agreement with that a few miles farther 

 up Grand River, next to be considered. But Nos. 12 and 13 are quite 

 unlike the strata underlying the Shinarump conglomerate in Arizona. 

 Fossil wood was not mentioned by Newberry in any of the strata 

 assigned to the Trias. These considerations show that that part of 

 the section on lower Grand River corresponding to the Shinarump 

 in stratigraphic position does not in fact resemble the typical section 

 of that group closely in any particular. 



Grand River Valley near Moab. — That the generalization just 

 expressed is correct has been amply demonstrated by an examination 

 by myself and associates of the formations exposed in the Grand 

 River Valley near Moab and for about twenty five miles above that 

 point. I have recently published (5) the results of that recon- 

 naissance, made in 1905, and need here repeat only the salient facts 

 affecting the question of the Shinarump. 



The Vermilion Cliff and White Cliff sandstones, of the general 

 character noted by Powell, are unmistakable datum formations 

 from which to start in stratigraphic studies in Grand River Valley. 

 Below the former, however, we found many things at variance with 

 the idea of simplicity and regularity in this part of the section. Oppo- 

 site Moab on the northwest side of Grand River the section exposed 

 below the VermiHon Cliff sandstone is as follows : 



SECTION NEAR MOAB, UTAH 



FEET 



Top, Vermilion Cliff Sandstone 

 12. Sandstone, massive or shaly, dark red at base and bright red at top . 20 

 II. Shaly, conglomeratic sandstone with numerous reddish Hmestone peb- 

 bles the size of a pea or smaller; a few small bone fragments . . 6 

 10. Sandy shales, red and green . . . . . . . . 5 



9. Debris slope apparently representing red shale .... 20 



8. Limestone conglomerate, with a few inches of limestone at top; fossil 



wood and bone fragments; pebbles less than two inches diameter . 10 

 7. Sandstone, gray, massive . . . . . . . .20 



