324 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



13. Massive beds of blue limestone weathering gray and 



showing bluish, irregular lentils ; interbedded with 

 beds of shaly limestone and calcareous shale. Other 



bands arc thin-bedded limestone 150 45.7 



(The relative amounts of the various types in the 

 above 150 feet could not be distinguished. A dark 

 green dyke cuts vertically through these lower beds, 

 and pinches out in a distance of a few yards.) 



14. Thin-bedded limestone weathering into gray and blue 



bands ; the former are more argillaceous 52 15.9 



15. Exposed to west of section : chcrty limestone weathering 



with hard nodules, and interbedded limestones weath- 

 ering into roughly pitted shaly fragments with a 

 graty feel. In contact with slates and shales of the 

 overlying formation 160 48.8 



Total thickness measured 992 302.4 



Total thickness estimated 833 253.9 



Total thickness for Ottertail formation 1,825 556.3 



The Ottertail formation seems to have a thickness 

 of about 2,450 feet (746.8 m.) in Limestone Peak, 

 which means a considerable thickening of the forma- 

 tion to the southeast of the Ottertail escarpment. 

 Fauna. — Dr. Allan found only a few fragments of fossils. 

 In 1918 Mrs. Walcott and I found at Wolverine Pass 

 near the base of the formation the following (63X) : 

 Obolus myron Walcott 

 LingidcUa siliqua Walcott, together with 

 undescribed trilobites. 



Chancellor Formation 



I. Thinly-laminated, gray argillaceous and calcareous 

 shales, weathering reddish, yellowish, and fawn-colored , 

 in the upper half of the formation; these are super- 

 jacent to highly sheared gray shales, slates, argillites, 

 and phyllites in the Ottertail Valley 4,500 -f- 1,371.6 -f 



Fauna. — Faint traces of Agnostus sp. 



Bow Lake Section 



This section was meastired on the east slope of the mountain, 

 directly north of the head of Bow Lake and about 3 miles (4.8 km.) 

 northeast of Mount Thompson on the Continental Divide. It is 22 

 miles (35.4 km.) north-northwest of Mount Bosworth, and about 

 27 miles (43.4 km.) in a direct line from Mount Whyte. The thick- 

 bedded Cathedral limestones form the summit of the mountain and 

 extend down 800 feet (243.8 m.) or more. Their lower contact with 



