NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 2.']l 



Feet Meters 



east, where the Devonian limestone is superjacent to 



the Lower Sarbach annelid limestone, and in the 



Ranger Canyon section of the Sawback Range 14 miles 



(22.5 km.) to the southeast of the Johnston-Wild 



Flower Canyon Divide. 



\a. Hard, dark, dirty gray and bluish-black limestone, with 

 some nodules and stringers of dark-weathering chert, 

 in layers up to 3 feet (.9 m.) thick, that split into thin, 

 irregular layers in the weathered outcrops 225 68.6 



Fauna. — Annelid trails and borings in and on nearly every 

 layer that are usually more or less replaced by dark- 

 weathering chert and finely arenaceous limestone. An 

 irregular layer of bluish-gray limestone 4 to 6 inches 

 (10.2 to 15.2 cm.) thick, 127 feet (38.7 m.) below the 

 top of Iff contains a Mcgalasp'is fauna in which a 

 species of Orthoid brachiopod is very abundant. This 

 fauna is to be compared with (2ix) and (69a) of the 

 Fossil Mountain section. 



\h. Light gray, compact, rough-weathering, more or less 

 cherty and siliceous limestones in thick layers that 

 split into thinner layers on weathered slopes 135 41. i 



Fauna. — Abundant annelid trails and borings, with Orthoid 

 brachiopods, and Lccanospira (69h). 



ic. Hard, dirty gray, irregular siliceous limestone in thick 

 layers that split into thin layers .5 to 3 inches (1.3 to 

 7.6 cm.) in thickness, the surfaces of which are usually 

 fretted with a network of annelid trails and borings 

 that are replaced by chert and hard, siliceous, dark, 

 buff-weathering limestone 5 1.5 



Fauna. — Annelid trails and borings with sections of gas- 

 tropods on eroded surfaces. In a bluish-gray layer 

 2 to 4 feet (.6 to 1.2 m.) above the base of ic 

 apparently the same fauna as the preceding zone (69i). 



id. Thin layers of cherty and siliceous limestone with a 



few layers of interbedded dove-gray limestone 6 1.8 



Fauna. — (69J) : same as preceding. 



Total 371 113.0 



OZARKIAN 

 MoNS Formation 



Several hundred feet of thick layers of bluish-gray to 

 dove-colored limestone outcrop on the southeast slope 

 of the Pass down to the bottom of the cirque at the 

 head of Johnston Creek. These beds contain the 

 Ozarkispira fauna. 



