139 



higher peaks of rock remained over the surface, when the water 

 commenced to dry off the streams cut their way back through the drift, 

 leaving the land in its present condition of elevation and gradual de- 

 nudation. 



IL PALEONTOLOGY. 



By Henry M. Ami, m.a., f.g.s. 



(1.) At Cook's Rapids, on the Castor River, on the 8th lot of 

 concession IX. in the Township of Russell there is exposed a series 

 of bluish-gray shaly, nodular and at times unevenly-beded lime- 

 stones which, from the fauna it holds, is clearly referable to the 

 middle porton of the Trenton formation (Ordovician), an hoi-izon which 

 is met with at Ottawa, and represented in the beds which crop out in 

 the vicinity of the Waterworks Office and at the foot of Parliament or 

 old Barrack Hill. The association of fossil remains is precisely similar 

 here as in those localities, and amongst them were recognized the fol- 

 lowiug species : 



1. Buthotrephis gracilis, \i-A\\. 13. Platystrophia lynx, Eichwald. 



2. Lic7'ophycv.s succulens, a. (Sp.) 14. BeUe)'opho7i bilobatus, Sowerhy. 



3. Pascal us glohosus, IBiliings. 15. Bucania bido7'sata, HaW. 



4. Bi'achiospongiadigitata, Owen. 16. Cy7-olites compressus, GonYnd. 



5. Protarea vetusta, Hall. 17. Murchisonia hellicincta, Hall. 

 G. Slrepielasma corniculum, Hall. 18. ' Milleri, Hall. 



7. Prasopora lyG02)erdo)i,Yan\i^em 19. " gracilis, Hadl. 



8. Strophomena alternata, Conrad. 20. Trochoneinau/nbilicatum,\iii\\. 



9. Leptcena sericea, ^owevhy. 21. Asajyhus megisios, l^ocke. 



10. Orihis testudinaria, Dalman. {Isotelus gigas, DeKay.) 



11. " pectinella^ Coiiv&d. 22. Encrinurus vigilans, S.2t\\. 



12. " occidentalis,Ti-A\\. 23. Dabna^iitescallicephalus, Green 

 The above species were collected by Messrs. Craig and Sum- 



merby in company with the writer during a sub-excux'sion of the 

 geological branch in 1884, and, as may readily be inferred from the 

 small list presented, the same could be greatly increased by subsequent 

 research in those measures which are very fossiliferous. 



