THE BANNOCK OVERTHRUST 687 
Thickness 
Description Ft. In. 
shalesblack phosphatic, finely @OltiC. 20.6008 ae a wis o ee 5 6 
Wimmestone wdarktetidieit sac shes Wl ater ie eee ake 6 
Shale, brown, somewhat phosphatic, contorted............... 15 ° 
Limestone, dark gray, dense (‘‘Cap Lime”’ fossils)............ 23 ° 
Phosphate rock, dark brown, medium oolitic, soft, broken, 
apparentlyamiphvsrades — cs... ses. sate sees so aC 
Shalembprowne. contorted SOltir. «os casita mus os lise ees oad I ° 
Sandstone, white, calcareous, weathers buff. Top of Wells 
formation 
aihickness.ofaphosphate:shales!. 22% jc): sdc0 ss ees 175 «25 
dibhickmessioimormatlony, aches sais ses se cssievote es bees oe 4I5 
* Corresponds to bed from which sample 144S was taken. (roc) 
The Phosphoria formation is the equivalent of the upper two 
members of the Park City formation (4a) (1o0b) as heretofore 
mapped in the phosphate district of Idaho and Utah, namely, the 
‘overlying chert’’ and the phosphate shales. These members 
have also been recognized in the type section (4a) of the Park City 
in Cottonwood Canyon by H. S. Gale,’ who reviewed the section in 
1909 and noted the presence of phosphate rock. Gale regards the 
upper 129 feet of Boutwell’s section (4a) as approximately equiva- 
lent to the chert member, and the underlying 112 feet as represent- 
ing the phosphatic shale interval. 
The remaining 194 feet is predominantly siliceous but contains 
a number of prominent limestone beds and is evidently comparable 
to the underlying siliceous limestone or calcareous sandstone of 
the phosphate districts. 
The Park City formation was first referred by Boutwell to the 
Pennsylvanian, but in his later work on the district (5) has been 
referred as a whole doubtfully to the Permian. The lower portion 
contains the bonanzas for which the Park City district is famous 
and is therefore the essential part of the formation. This member 
is now upon additional faunal evidence referred to the Pennsyl- 
vanian. 5 
The Phosphoria formation is also correlated with the upper 
portion of the Embar formation of Wyoming (8a) (ga) (3a), and 
t Personal communication. 
