266 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



The same character of bluish-gray shale and lime- 

 stone, and gray, compact, banded limestone continues 

 down to base of ib 750 228.6 



Total of Mons formation 986 300.5 



Fauna. — The Mons has not yielded very good collections at 

 this locality, but the presence of Ocarkispira, Keytella 

 and Symphysiirina has been proved. The Kainella 

 zone has not been noted. Lower Ozarkian ? 



Unnamed Formation 



la. Massive-bedded, gray limestone breaking down on 



weathering into thin and shaly layers 190 57.9 



From ID to 15 feet (3.0 to 4.6 m.) above the base, 

 two thick layers occur carrying Cryptozoa on their 

 upper surface. These vary from 6 inches (15.2 cm.) 

 to 14 inches (35.6 cm.) in diameter and can be col- 

 lected only by blasting the solid compact limestone. 



lb. Thin layers of compact, hard, gray limestone with shaly 

 limestone and calcareous shale interbeddcd in thin 

 bands 120 36.6 



Fauna. — (66k) : Eoorthis iophon Walcott, together with 

 gastropods and a number of undescribed trilobites, 

 including the genera Hardyia and Saukia. 



ic. Thick-bedded, gray oolitic limestone, with coarse botroi- 

 dal structures in lower layer. This belt and the thin 

 layers just above weather rusty brown and form red- 

 dish-brown debris slopes 90 27.4 



Strike N. 5° W. Dip W. 5° S. 70°. 

 A few bands of shale occur as partings between 

 the bands of limestone. 



Total 400 121.9 



Fauna. — Fossils were most abundant and best preserved in 

 the lower 30 feet (9.1 m.) of \c. (66j) : Fauna 

 similar to preceding, containing species of the genera 

 Eoorthis, Agnostus, Briscoia, and Platycolpus. 



This formation, 400 feet (121. 9 m.) thick, was 

 first assigned to the Upper Cambrian, but a study of 

 the faunas indicates that they represent a Lower 

 Ozarkian horizon. , 



UPPER C./VMBmAN 

 Lyell Formation 



10. Gray arenaceous and magnesian limestone in thin and 

 massive layers. 



At 378 feet (115.2 m.) down, a band of dark, lead- 

 colored, rough-weathering magnesian limestone oc- 



