NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 283 



DiSCONFORMITY P^^^ Meters 



ORDOVICIAN 

 Skoki Formation 



The Skoki limestone was not recognized in this 

 section ahhough the upper part of la of the Sar- 

 bach formation may include it. 



CANADIAN 

 Sarbach Formation 



la. Thick-bedded, gray limestone, weathering light gray, 

 passing down into massive bands of gray dolomitic 

 limestone that form two high cliffs on east front of 

 mountain. Numbers la-d of section at the north- 

 east shoulder of Fossil Mountain may correspond to 

 the upper part of la of this section 840 256.0 



lb. Light gray magnesian limestone in thin layers, with a 

 few irregularly alternating layers i to 3 feet (.3 to 



.9 m.) in thickness 147 44.8 



Strike N. 30° W. Dip W. 30°, S. 30°. 



ic. Light gray magnesian limestone, with nodules and 



stringers of chert 55 16.8 



id. Thick layers of chcrty quartzite that breaks down on 



conchojdal fractures into small fragments 48 14.6 



Total Sarbach, formation 1,090 332.2 



The upper 840 feet (256 m.) was measured rapidly 

 and may be in error 50 feet (15.2 m.). Only a few 

 fragments of fossils were observed, but i mile 

 (1.6 km.) to the south near the east base of Brachio- 

 pod Mountain several layers in the lower part con- 

 tained brachiopods and fragments of trilobites. 

 Among the genera represented are Lecanospira and 

 Goniurus. 



OZARKIAN 

 MoNS Formation 

 irt. Light gray, thick-bedded limestone, with bands and 



partings of calcareous shale 320 97-5 



Fauna. — From 10 to 30 feet (3-0 to 9.1 m.) below the top, 

 several layers carry fragments of trilobites, a few 

 traces of small gastropods, and numerous specimens 

 of Syntrophia. The fauna includes (660) : 

 Protorthis tones Walcott 

 Clarkella isis Walcott 

 Clarkella nisis Walcott 

 Clarkella nonus Walcott 

 Hystricurus sp. 

 Keytella sp. 



