NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 273 



Feet Meters 



(158.5 m.) as compared with 124 feet (37.8 m.) in 

 the Ranger Canyon section 15 miles (24.1 km.) to 

 the south-southeast. 

 la. Gray, more or less siliceous limestones, with thin layers 

 and stringers of dark-weathering impure chert and 

 great profusion of annelid borings and trails, replaced 

 by ferruginous cherty matter. The beds are i to 3 feet 

 (.3 to .9 m.) thick, breaking up into thin and shaly 



layers on weathered exposures 280 85.3 



The section is here covered by debris and by the 

 waters of Lake Gwendolyn. 



Eoorthis and sections of gastropods, Lecanospira 

 were noted 70 feet (21 m.) from top, also 170 feet 

 (51.8 m.) down, weathered out on surface of arena- 

 ceous limestone. 

 Thickness of concealed strata based on measured dip 



and strike 205 62.5 



Total of la 485 147-8 



\b. Thick-bedded coarse gray magnesian limestones. Strike 



N. 50° W. (Magnetic), Dip 20° SW 35 10.6 



Total of Sarbach 520 158.4 



OZARKIAN 

 MoNS Formation 



la. At the outlet of Lake Gwendolyn, thin and shaly- 

 bedded, light gray, compact limestones occur, with 

 thicker layers irregularly interbedded ; also large 

 and small thick lenticular masses of hard, light gray 

 limestone (one, 18 inches X 4 feet [45.7 cm. X 1.2 m.] 

 in size). Bands of calcareous shale begin to appear 

 30 feet (9 m.) from the top. At 60 feet (18 m.) 

 down, a massive layer of limestone 22 feet (6.7 m.) 

 thick occurs. At 476 feet (145.1 m.) down, the sec- 

 tion is cut off by stream bed and drift 476 145. i 



Fauna. — About 200 feet (60.9 m.) from summit in bluish- 

 gray limestones weathering pearl gray, (67q) contains 

 the KaincUa fauna, which extends to the bottom of 

 the formation. 



lb. Covered space. Thickness calculated from dip 57 17.4 



\c. Gray limestone, interbedded in calcareous shale similar 



to that above 62 18.9 



id. Thin-bedded and shaly, slightly arenaceous and fer- 

 rugineous limestone weathering reddish-brown and 

 forming a reddish-brown talus slope 18 5.4 



Fauna. — Locality (67s) contains a peculiar undescribed 

 fauna, the significance of which is not yet understood. 



