IJKVON'IAN' FdSSlLS Ol'' MANITOBA, K'I'C. .').")7 



The stratigi'Hphical relations (jf thu .sulxlivisious of the Devonian 

 .systom in this ref;'ion are clescrilied in detail iji Mr. Tyrrell'.s " Ue]ioi-t on 

 Nortli-westerii Manitoba, with iiorti(-)ns of the adjacent dtstricts of 

 ^Vssinilxiia and Saskatchewan," published as Part K of vol. \', New 

 Series, of the Annual Reports of this Surxey. In a preceding papei-, 

 published in the Ti'aiisactions of the Boyal Si.iciety of Canada for LSOl,* 

 Mr. Tyrrell states that " near the north-eastern angle of Lake Manitoba 

 the typical Niagara dolomites are o\ erlaiu by a few feet of thick-bedded 

 stromatoporoid niagnesian limestone holding I'lffiiostylas (! iiclplien.iix^'" 

 which probably represents the Guelph formation. " Over these Silurian 

 limestones there is, in the lacustral region, a gap in the known section," 

 and the lowest l*e\onian rocks exposed are a few feet of .soft red shales, 

 which are apparently uiifossiliferous. Above these shales, "a hundred 

 feet or more of harsh porous dolomites, ci.intaining Pcidaiuenis nmria, 

 itc, ' are " overlain by a similar thickness of tough white dolomites cim- 

 taining ,S/ri iir/oi'/'ji/ni/iix Bininn." Abo\e these dolomites arc fifty to 

 stwenty fi'et of calcareous shales marked by many In'ine springs along their 

 line of outci'Op ; to these succeed a " highly fossiliferous limestone coji- 

 taining great beds of Afrjjpii, ri'ticithi ris, and this is " overlain by light 

 grey compact brittle limestones which represent the local toj) of the 

 l)e\onian." '• As far as could be seen," the whole of these rocks "are 

 practically conformable and almost undisturbed throughout. 



It has already been stated (on page 258) that all the fossils that are 

 enumerated or ilescribed in the [iresent paper, are j)rol)ably from the 

 Middle and Upper r)e\()nian. The Middle Dex'onian apjiea.rs to be 

 I'cpresented in this region by the Stringocephalus zone and the hundred 

 feet 01' more of fossiliferous flolomite inmiediately beneath it, and the 

 Upper Devonian by all the beds ;ibo\ e the Stringocephalus zone and 

 beneath the Cretaceous. 



The discovery of dohjmites in which Si i-'ni(jof('pli<iliis limiiin is one of 

 the most characteristic fossils, at many localities on the shoi-es cjr islands 

 of Lakes Manitoba and A\'innipegosis, is of considerable interest to the 

 geologist. In Manitoba the Stringocephalus zone appears to occupy 

 much the same stratigi'aphical position as the Stringocephalus limestone 

 of Germany and England, and it is noticeable that among the fossils of 

 the Stringocephalus zone of Manitoba thei-e are sevei'al which can be 

 identified with well-known Eui-opean species. Among these are 

 ,Sphii'r<ini'(iH<ji-(i fcssi'/Zd/j': : Fii ras'ili-H (loflilaiichi-(i . I'dchijjxiirt rrrvu-iirni.'< ; 



*Vul. IX, Sect. 4, J. p. 91, !I2. 



