NO. 24 PTARMIGANIA STRATA RESSER 9 



boundaries. Additional comments have been added wherever deemed 

 desirable, hence the material is not to be regarded as quoted. However 

 no departure from figures, determination of beds, or lithologic descrip- 

 tion was allowed. 



WASATCH MOUNTAINS 



Two Mile Canyon.- — -Collections were made by Walcott in 1898 

 and 1906, and others by Meek at an earlier date. A section was 

 measured October 1898 and remeasured in 1906 with particular 

 attention to the upper beds. Faults required the measurements to be 

 made in different blocks, but care was evidently exercised in carrying 

 the section across the fault lines. The measured beds total 4,655 feet, 

 including some post-Cambrian strata. 



Walcott's section of the Middle Cambrian beds follows, the forma- 

 tional assignments being made in essentially the present manner by 

 Walcott himself. 1 



Nounan formation: 



Dolomite. Massive-bedded gray, passing upward into thin- Feet 



bedded bluish-gray dolomite 405 



Dolomite. Dirty gray, massive-bedded dolomite, banded in places 445 



Limestone. Thin-bedded, bluish-gray impure limestone, with 



trilobites. The trilobites represent undescribed genera 58 



Dolomite. Dirty gray, massive-bedded dolomite with a few 



shaly and sandy beds 180 



Total 1,088 



This and the overlying post-Cambrian beds were measured on 

 the south side of the canyon. 



Blooming ton formation : 



Limestone and shale. Alternating beds of thin-bedded limestone 

 and sandy and argillaceous shale. Fossils are fairly common Feet 



but are still undescribed 555 



Total 555 



1 A few days before this paper was submitted for publication a letter from 

 Prof. Deiss stated that he had examined the Two Mile Canyon section, May 

 1939. He furnished a copy of the lower part of his section, apparently as it was 

 measured in a fault block. According to the figures given, 650 feet of Brigham 

 quartzite remain above a thrust fault. Overlying the quartzite is 60 feet of im- 

 pure limestone containing beds of pure crystalline limestone with the Ptarmigania 

 fauna. A slight break separates the impure limestone stratum from 205 feet of 

 Spence shale and possibly beds of the Ute formation. 



