NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 361 



Feet Meters 



This formation is best seen in the west slopes of 

 Titkana Peak. Fossils were found at two horizons 

 that clearly correlate the lower part of the Titkana 

 formation with the Stephen formation of Mount 

 Stephen. 

 Fauna. — At the upper horizon the following species occur 

 (6iv) I mile (1.6 km.) east of summit of Titkana 

 Peak in cliff above Hunga glacier : 



Micrometra zenobia Walcott 



Obolus incconnelli Walcott 



Obolus sept alls Walcott 



Acrotreta cf. depressa Walcott 



Hyolithcs carinatus Matthew 



Selkerkia major Walcott 



Agnostus montis Matthew 



Zacanthoides spinosus Walcott 



Dorypyge dazvsoni (Walcott) 

 At a horizon estimated to be 1,000 feet (304-8 m.) 

 lower than (6iv), the following genera are represented 

 in the collection from localities (61I) and (6im), about 

 1.5 miles (2.4 km.) west-northwest of the summit of 

 Titkana Peak on slopes above Lake Adolphus ; 

 Acrothele, Acrotreta, Agnostus, Dorypyge, and 

 Zacanthoides. 



Tatei Formation 



Thick-bedded, gray siliceous and arenaceous limestones... 800 243.8 



Fauna. — No fossils found. 



Chetang Formation 



Bluish-gray, thin-bedded limestones forming a cliff beneath 

 the Tatei formation, a talus slope of about 100 feet 

 (30.5 m.) and then a second cliff above Coleman 



glacier and Brook 900 274.3 



This formation is well shown in Chetang Cliff, 

 2 to 3 miles (3.2 to 4.8 km.) north of the summit of 

 Titkana Peak. 

 Fauna. — At about 100 feet (30.5 m.) from the summit of 

 the formation (610) : 



Nisusia sp. 

 Zacanthoides sp. 

 Bathyuriscus sp. 

 At about 350 feet (106.7 m.) down in the formation, 

 at top of lower cliff, the following fauna occurs 



(6ip) : 



Albertella bosworthi Walcott (occurs at about 

 same horizon in Mount Bosworth section).^ 



' Smithsonian Misc. Coll., Vol. 53, No. 5, 1908, p. 214. 



