PRE-MOENKOPI UNCONFORMITY OF COLORA DO PLA TEA U 67 



itself is not particularly well marked in the vicinity of Fruita, but 



the entirely different character of the beds on which the Moenkopi 



rests here and near Mule Twist constitutes a difference which 



perhaps might result from lateral variation, but which more 



probably indicates a different horizon as the base on which the 



Moenkopi beds were deposited. No fossils were seen in the Fruita 



section. 



About ten miles northwest of Fruita, and perhaps three miles 



southeast of Torrey, the following section was measured across the 



contact: 



SECTION NEAR TORREY, UTAH 



red sandy shale 

 gray shale 

 red sandy shale 



gray to brown, thin-bedded sandstone 

 red sandy shale, ripple-marked 

 covered slope 



thin-bedded sandy gray limestone, upper contact con- 

 cealed 



very crystalline, pitted gray limestone 

 thin-bedded argillaceous limestone 

 covered 



crystalline gray pitted limestone 

 argillaceous white sandstone 

 gray crystalline limestone 

 fine-grained argillaceous white sandstone 

 massive gray limestone 

 I 42 -f- feet red shale with gypsum veins, base not exposed 



The boundary of the Pennsylvanian and the Moenkopi is 

 here believed to occur between members 10 and 11. The red shale 

 (number i) of this section, below the fifty-two-foot ledge of gray 

 limestone, is beheved to correspond to the fifty-five feet of red shale 

 (number 24) in the Fruita section, also below fifty feet of massive 

 Umestone. Beds 3 to 10 of the Torrey section seem to have been 

 eroded off at Fruita. 



Ramah. — On the west flank of the Zuni Uplift, about six miles 

 east of Ramah, New Mexico, along a sharp canyon, followed by 

 the main wagon road, the situation is as follows: about fifty feet 

 of red sandy shales and sandstones rest with very uneven contact 



