248 E. M. Kindle— Notes on Devonian Faunas. 



valley fauna to represent a Middle Devonian horizon. It rep- 

 resents in the writer's opinion both Middle and Upper Devonian 

 horizons. In the i'annnle now under discussion from North- 

 west of Hope such distinctly Upper Devonian species as 

 Spirifer disjunctus, which is conspicuous in the fan miles listed 

 by Whiteaves,"* are wanting and the species present appear to 

 represent the Middle Devonian fauna of the MacKenzie 

 valley. 



The single species of coral which represents the Gull Lake 

 Devonian fauna affords rather meagre evidence for its close 

 correlation with other faunas, but the presence of the same 

 species of Acervulariam the fauna just listed from Northwest 

 of Hope suggests that they are both representatives of the 

 same Middle Devonian horizon. 



Another collection from the MacKenzie River Valley which 

 has recently been studied by the writer shows in addition to 

 the faunas with which we are familiar through the work of 

 Meek, McConnell, and Whiteaves, a Devonian facies not pre- 

 viously recognized in that region. This collection was made 

 by Mr. Charles Camsell at Pine Point, on the south shore of 

 Great Slave Lake. The fossils from this station are from beds 

 described in Mr. Camsell's notes as " very bituminous and full 

 of fossils. They lie flat and are associated with beds of lime- 

 stone in low cliffs 3 or 4 feet high at the water's edge." 



The fauna occurs as flattened or crushed shells in a black 

 calcareous and highly bituminous shale. Some specimens 

 might be properly called limestone, — coal black in color. 

 When freshly broken this rock gives a strong petroleum odor. 



The species recognized in this black shale fauna are the fol- 

 lowing : 



Ling > da sp. 



Leiorhynchus cf. laura 

 Pterochaen ia frag His 

 Styliolina fissurella 

 Tentaculites graeilislriatus. 



The fauna of this black shale has not been previously recog- 

 nized in the MacKenzie Jttiver Valley. This fauna contains 

 nothing which will enable one to decide positively with which 

 one of three or four Middle and early Upper Devonian black 

 shale horizons it is most closely allied. The last three species 

 might occur as early as the Marcellus shale or as late as the 

 Ithaca shale of the New York Portage. The absence of species 

 characteristic of the black shale horizons of the Portage, how- 

 ever, together with the closer resemblance of the Leiorhynchus 

 to a form not common above the Marcellus, lead me to place 

 the fauna, provisionally, in the Middle Devonian. 



Geological Survey. Ottawa, Canada. 



*L. e.,pp. 248-253. 



