NO. I FORMATIONS OF BEAVERFOOT-BRISCO-STANFORD RANGE I9 



The shales at the base are in direct contact with the mas- ^^^^ Meters 



sive magnesian limestones beneath. 



Total measured thickness of No. 4 1,220 371.9 



Near the base the strata strike north 25° west and dip 70'' 



south 25° east. 

 Fauna.— From 30 to 75 feet (9.1 to 22.8 m.) above the base, 



just below the hot springs, a small and characteristic 



fauna occurs in the shales and thin layers of limestone. 



(Locality 2id.) 



Lingulella cf. simtlis Walcott 

 Lingulclla cf. desiderata Walcott 

 Eoorthis cf. iophon Walcott 

 Taenicephalus sp. 

 Ptychostegium sp. 

 Ptychoparia sp. 



At about this horizon on the opposite side of the canyon 

 450 feet (i37-i ni.) above the canyon bottom there was 

 found (locality I7p) : 



Obolus cf. leda Walcott 



Agnostus cf. josepha Hall 



Agraulos sp. 



Ptychaspis sp. 



Irzn?igella ? sp. 



Saratogia cf. wisconsinensis Owen 



Briscoia opimhis Walcott 



About SOD feet (152.4 m.) above the canyon bottom and 

 400 feet (121.9 m.) above the base of No. 4 in the sec- 

 tion the Briscoia fauna occurs in thin layers of lime- 

 stone through 50 feet (15.2 m.) or more of the shale. 

 (Locality i6t') 



Obolus 2 sp. undt. 



Lingulella cf. desiderata Walcott 



Agnostus 



Briscoia dalyi Walcott 



Saukia sp. 



Saiikia maurus Walcott 



Saukia numenia Walcott 



Briscoia sinclairensis Walcott 



Briscoia superlata ? Walcott 



Kingstonia sp. a 



Platycolpus sinclairensis ' 



Plethopelfis ? sp. 



In a band of interbedded layers of dove gray limestone 30 

 inches (76.2 cm.) thick 600 feet (182.8 m.) from the 

 base of No. 4, a small, strongly marked Symphysurina 

 faunule occurs. (Locality i6u.) 



