DEVONIAN. 335 



fconian forms. If we accept his Tiew it follows that the associated Oriskanian forms continued 

 to live on after the epoch of the Oriskanian fauna into Hamiltonian time. 



By the interpretation here offered it is assumed that the Hamiltonian types of the fauna 

 are possible ancestors of Hamiltonian species living in the Oriskanian epoch, which by some 

 movements of the currents of the ocean were brought together in the Acadian province before 

 the revolution which upset the biologic equilibrium of the Oriskanian fauna had completed its 

 work. 



The further conclusion is that it was the same events which caused the cessation of the 

 distinctive Oriskanian fauna, which brought into this area the ancestors of the Hamilton 

 species, and that the geologic time of the events was approximately equivalent to the Schoharie 

 epoch of New York State. 



M-N 14. MANITOBA. 



The Devonian of Manitoba consists of about 500 feet of strata, chiefly dolomite 

 which represent Lower, Middle, and Upper Devonian terranes. They are described 

 by Tyrrell ^" as follows : 



Upper Devonian or Manitoban: Feet. 



Light-gray hard, brittle limestone containing Aihyris vittata, etc., underlain by red argillites, 



outcropping at Rose Island and in the vicinity in Swan Lake, and at Point Wilkins 100 



Light-gray hard limestone, seen at Onion Point, Snake Island, Beardy Island, etc 40 



Red and gray shale, seen near the mouth of Bell River, south of Weston Point, etc 70 



Middle Devonian or Wiunipegosan: 



Whitish or light-yellow hard, tough, generally compact dolomite containing Stringocephalus 

 burtini and numerous other fossils. It outcrops chiefly on the island and shores of Daw- 

 son Bay, and southward to Point Richard on Lake Manitoba 100 



Porous spongy yellow doloinites of Pemmican Island, Devil's Point, Macoun Point, etc 100 



Lower Devonian : 



These beds have not been clearly defined, but they appear to be composed of red and other 

 shales 100 



Whiteaves "^ has described the fossils from these Devonian rocks and says: 



It has already been stated that all the fossils that are eaumerated or described in the present 

 paper are probably from the Middle and Upper Devonian. The Middle Devonian appears to 

 be represented in this region by the Stringocephalus zone and the 100 feet or more of fossilif- 

 erous dolomite immediately beneath it, and the Upper Devonian by all the beds above the 

 Stringocephalus zone and beneath the Cretaceous. 



The discovery of dolomites in which Stringocephalus burtini is one of the most charac- 

 teristic fossils, at many localities on the shores or islands of Lakes Manitoba and Wiimipegosis, 

 is of considerable interest to the geologist. In Manitoba the Stringocephalus zone appears to 

 occupy much the same stratigraphical position as the Stringocephalus limestone of Germany and 

 England, and it is noticeable that among the fossils of the Stringocephalus zone of Manitoba 

 there are several which can be identified with weU-known European species.*^ 



The "Cuboides zone" appears to be represented in this region by those beds on the Red 

 Deer River and elsewhere. 



M-N 16-17. JAMBS BAY, ONTAEIO. 



In 1875 Bell ^^ reported the occurrence of dark-gray bituminous limestone at the 

 Grand Rapids of the Mattagami (latitude 50°, longitude 82°) and collected fossils, 

 which Whiteaves reported as being of Devonian age, of the horizon of the "Cor- 

 niferous" limestone. The strata are exposed in a cliff 40 feet high. They are flat 

 lying and rarely outcrop in the district, but extend north beneath James Bay and 

 beyond Albany River. Dowling^'^'' states that the Devonian rocks do not reach 



- For list of fossils see the work cited. — B. W. 



