354 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



traced southwest, diagonal to the strike, along- and down the slopes 

 on the east side of Smoky River and Lake Adolphus to a point almost 

 due north of Titkana Peak and about 1,500 feet (457.2 m.) east of 

 the northeast end of Lake Adolphus (see pi. 94). 



A series of thin-bedded, arenaceous and siliceous limestones inter- 

 bedded in siliceous, arenaceous, and argillaceous shales superjacent 

 to the Tatei were partly measured and estimated to a thickness of 

 1,700 feet (518.2 m.), and the name Hitka was given to them. No 

 fossils were found in the one traverse made of this portion of the 

 section. From the top of Tatei Clififs, the strata referred to the 

 Hitka appeared to continue across the Smoky River Valley into Mount 

 Hitka northeast of Mount Mumm (see pi. 102), and this was assumed 

 tentatively but not verified. At the north-northwest base of Titkana 



MUMM PEAK 



ROBSON PEAK 



TITCANA TEAK 





HOTA FORMATION 



Fig. 35. — Outlines of mountains and cliffs shown in plate 102. 



Peak, a massive-bedded, gray, siliceous magnesian limestone estimated 

 at 600 feet (182.9 m.) and dipping 30° southwest came in above the 

 Hitka shales and limestones, and was later named the Mumm forma- 

 iton. As in the case of the Hitka, the limestones seen across the 

 Smoky River Valley 2 miles (3.2 km.) or more away in Mount Mumm 

 were assumed to represent the same formation, but the supposed 

 formation named Mumm was at the base of Titkana Peak. No 

 fossils were seen, nor was there apparent evidence of a fault above 

 or below them, but there are evidently one or more faults in the 

 canyon valley of Smoky River between Titkana and Mumm Peaks 

 (pi. 102), and probably a fault between Chetang Ridge and Titkana 

 Peak. From my observations in 1913, I knew that there was dupli- 



