﻿93 Outcrops i 5 



Mr. Arnold Hague, who as a member of the Fortieth Parallel 

 Survey appears to have been the first geologist to visit these can- 

 yons, describes briefly the section in Blacksmith Fork Canyon. 

 To the scenery of the bold canyon walls Hague very justly pays 

 the superlative compliment that it is the most beautiful "to be 

 found within the limits of this Survey 8 ." In describing the 

 Blacksmith Fork section Hague refers to two formations 9 the 

 beds studied by the writer. These in descending order, are the 

 Wasatch limestone, the Ogden quartzite. The last term prob- 

 ably includes the beds lying at the base of the section studied by 

 the writer, or the Ordovician of our present classification. The 

 names Ogden quartzite and Wasatch limestone were both based 

 on sections exposed between Ogden and Salt Lake City, con- 

 siderably south of this region. The Ogden quartzite as applied 

 by Hague may also have included the white magnesian limestone 

 of the writer's section, which locally is highly siliceous and con-* 

 ta^ns a Silurian fauna 10 . The Jefferson limestone with which the 

 writer correlates the dark magnesian limestone above the 

 Silurian horizon evidently represents only a portion, and pre- 

 sumably the lower portion of the "Wasatch limestone." In 

 introducing the term "Wasatch limestone" King 11 made no 

 attempt to separate the Carboniferous and Devonian horizons 

 and states that the formation includes a limestone series 5000 to 

 6000 feet thick which ranges from Devonian to Coal Measures in 

 age 12 . The extreme comprehensiveness of the term Wahsatch 

 limestone would preclude its use in the more detailed work of the 

 present time, even if it had not been made unavailable by the 

 well established use of "Wasatch formation" for Eocene rocks in 

 the same general area. 



8 Rept. Geol. Expl. 40th Par. 1877 p. 408. 

 9 " " " " " " p. 408. 

 I0 Kindle, E. M., Occurrence of the Silurian fauna in western America 



Am. Jour. Sci., vol. 25, 1908, p. 127. 

 "Am. Jour. Sci., 3d ser., vol. 11, 1876, p. 478. 

 ,2 Rept. Geol. Expl. 40th Par., vol. 1, 1878. 



