332 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



Fauna. — At 288 feet (87.7 m.) from the base, fragments of 



a large Asaphoid trilobite occur ; also a few brachio- 



pods. (65y) : 



Oboliis sp. (fragments) 



Ungnlella cf. manticula White 



Protorthis tones Walcott 



Agnostus sp. 



Hystricurus sp. 



Kainella sp. 



Symphysiirina sp. 



\d. Pearl-gray calcareous shales, with a few thin layers of 



limestone weathering gray and buff 62 18.9 



\e. Gray limestone in thin uneven layers, with parting of 



arenaceous and calcareous shale. A few layers of 



interformational conglomerate limestone also occur.. 18 5.5 



Fauna. — (65V) : 



Syntrophia cf. calcifera Billings 



Symphysurina sp. 



I 



Total of Mons formation 1,338 407.8 



UPPER CAMBRIAN 

 Lyell Formation ^ 



la. Gray, bufif-weathering, slabby dolomitic limestone, with 



thin, interbedded, gray limestone 8 2.4 



Fauna. — (65X) : 



Syntrophia cf. calcifera Billings 

 Maladia americana Walcott ? 

 Corbinia horatia Walcott . 

 Corbinia valida Walcott 

 I i?. Thin-bedded, coarse, dolomitic limestone, resting on 



massive-bedded, dolomitic limestone 48 14.6 



Strike W. 30° N., Dip 20° S. 30° W. (Magnetic) 

 2a. Massive-bedded, steel-gray magnesian limestones, with 

 a dark lead-color limestone breaking down in bands of 



thin layers 2 to 6 inches (5 to 15 cm.) thick 910 277.4 



2b. Thin-bedded, hard, gray, finer-grained limestones than 



2a, in thin layers 140 42.7 



Total Lyell 1,106 337-1 



Sullivan Formation 



\a. Thin-bedded, gray limestone, with some bluish-gray 

 softer layers and oolitic layers 3 to 8 inches (7 to 

 20 cm.) thick 130 39.6 



ifc. Thin-bedded, hard, gray limestone, with a few shaly 



layers 145 44.2 



^ Some of these beds may prove to be Lower Ozarkian rather than Upper 

 Cambrian. — C. E. R. 



