24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



7. Medium gray limestone in layers varying from one to six Meters 



inches (2.5 to 15.2 cm.) in thickness, with occasional 



layers 12 to 30 inches (30.4 to 76.2 cm.) 250 76.2 



Fauna. — ^About 80 feet (24.3 m.) below the top of 7, a well 

 marked faunule occurs that contains many specimens of 

 Syntrophia. (i7x.) 



Eoorthis cf. putillus lacv'mscuJa Walcott 

 Syntrophia nonus Walcott 



8. Alternating bands of gray limestone and drab gray argil- 



laceous shale 390 1 18.8 



Fauna. — Fragments of trilobites {Xenostegium sp.) in 

 limestone about 190 feet (57.9 m.) from the top. (17 o.) 



9. Thick-bedded, dark gray limestone with a few oolitic 



layers 18 5.5 



Fauna. — None observed. 

 10. Argillaceous shale with a few interbedded layers of hard 

 bluish gray, more or less intraformational conglomerate 



limestone 340 103.6 



Fauna. — At 170 feet (51.8 m.) below the top numerous 

 fragments of the Briscoia faunule occur. (i7n.) 

 Obolus ion Walcott 

 Lingulella ibicus Walcott 

 Lingulcpis nobis Walcott 

 Acrotrcta sp. undt. 

 Eoorthis cf. putillus Walcott 

 Briscoia sinclaircnsis Walcott 



Concealed by debris 117 35.7 



Total Mons exposed 3,666 1,117.3 



LTPPER CAMBRIAN 



Lyell Formation (See p. 39) : 



Below the lowest exposure a drift-covered slope extends down to a cliff 

 formed of a thick-bedded, rough weathering, semi-crystalline, magnesian lime- 

 stone dipping to the north N. E. 30°. It is unlike any of the limestones above 

 the Mons and corresponds in position to the magnesian limestone beneath the 

 Mons near Fairmount Hot Springs, and at the southern end of Stanford Range 

 on Sabine Mountain east of Canal Flats and east of the Radium Hot Springs 

 fieneath the base of the Mons in Sinclair Canyon. (See pp. 20 and 28.) 



The thickness of this supposed equivalent of the Lyell limestone is about 

 125 feet (38.1 m.) down to the level of Stoddart Creek. 



SUMMARY OF SECTION OF MONS IN STODDART-DRY CREEK SECTION 



Feet Meters 



1. Limestone with shaly partings 788 240.2 



2. Alternating bands of limestone and shale 648 197.5 



3. Limestone and shales i,ii5 339-8 



4. Limestone 250 76.2 



5. Shales with little limestone 748 227.9 



Concealed by debris 117 35.7 



3,666 1,117.3 



