ENDLICH AXD HAGUE HILLS 323 



Hayden Survey of the Territories, and one of the first geologists to visit 

 the Leucite hills. 



HA G UE HILL 



Southwest of the necks above mentioned there is a second talus cov- 

 ered hill which was not visited. This is much larger and is also much 

 higher than the one just described. Whether or not it contains a por- 

 tion of a sheet in ])]ace can not be definitely stated. There is no scarp 

 about it, and from the distance of a half mile nothing but talus blocks 

 were visible. We name it Hague hill after Mr Arnold Hague, the chief 

 of the Yellowstone Park party. 



Or END A Mesa 



This is a large mesa, some 3 miles north of Zirkel mesa, and has not 

 hitherto received sufficient attention. It is an irregular flow or series 

 of flows, bounded with a scarp, but it also has three cones and a con- 

 siderable surface of an undulating nature. It is nearl}" a mile in length 

 from the northwest to the southeast and about a half mile in width. It 

 is illustrated by figure 1, plate 43. The highest cone is approximately 

 7,750 feet above tide. The other two to the northward are considerably 

 lower. While the scarp is in places quite high, there are several points 

 near the head of slight gulches where it can be ascended with ease and 

 where the first flow of lava seems to have been much thinner than in the 

 average exposure. The cones were not ascended, but about their bases 

 the yellowish pumiceous rock was found, such as occurs at cone number 

 1 on Zirkel mesa; otherwise the surface flow on the south edge of the 

 mesa was a very fine grained dark rock, having a conchoidal fracture. 

 When found in large fragments it would ring like a bell when struck 

 with a hammer. 



After studying this mesa from Zirkel mesa and also from the trail that 

 leads to the west of it, we concluded that it was highly probable that 

 there were five flows of lava, which from a distance seemed to be dis- 

 tinguishable, but which presented a very complex structure. Appar- 

 ently on the first lava flow there came a second. Either later or at the 

 same time with it an old ring seemed to have developed. Then resting 

 on number 2 come successive terraces of 3, 4, and 5, the last forming a 

 shoulder near the top. The highest cone seems to be the residue of this 

 weathered complex. A picture of Orenda mesa is given in figure 1, 

 plate 14, volume 7, of this Bulletin. 



The name Orenda mesa is taken from the state map of Wyoming, 

 which has been issued by the United States Land Office, but we do not 

 know its derivation. 



