20 The Ottawa Naturalist. [April 



Contribution to the PALyEoNOLOGY of the Post- 

 Pliocene Deposits of the Ottawa Valley. 



By Henry M. Ami, M.A., D.Sc. 



In connection with the Pleistocene fossils of the Ottawa 

 district, the writer has brought together a few notes which may 

 be deemed of service to those who wish to carry on further 

 investigations in this promising field. The evidences of fossil 

 marine organisms in the sands, clays and gravels about Ottawa 

 are as follows : — 



(i) In his " Contributions to the Pleistocene flora oj Canada "* 

 Prof. D. P. Penhallow has noted the occurrence of many species 

 of trees and plants in the concretionary nodules found in the 

 marine clays of Green's Creek, Besserers, &c., in the Lcda Clay 

 formation (Pleistocene) of the Ottawa Valley. From the col- 

 lections of nodules recently made at Besserer's Grove and sent 

 to Prof Penhallow for examination he has recognised the 

 following interesting flora as may be also gathered from a letter 

 by Dr. Penhallow. 



1. Betula lutea. 8. Potamogeton perfoliatus. 



2. Cyperacese. 9. " pusillus. 



3. Equisetum limosum. 10. " rutilans. 



4. Fucus digitatus. 11. Potentilla Anserina. 



5. Hypnum fluitans. 12. Vallisneria sp. 



6. Populus balsamifera. 13. Typha latifolia (?). 



7. " grandidentata. 



(2) In " Geological History of Plants'' \ Sir William Dawson 

 has recorded the following species of fossil plants from the 

 nodules found at Green's Creek by himself and other collectors : 



1. Potentilla Canadensis. 7. Potamogeton perfoliatus. 



2. Drosera rotundifolia. 8. " pusillus. 



3. Acer spicatum. 9. Equisetum scirpoides. 



4. Gaylussaccia resinosa. 10. Fontinalis, sp. 



5. Populus balsamifera. 11. Fucus or Ulva, sp. 



6. Thuja occidentalis. 12. Carices and Gramineae, several species. 



Regarding these plants Sir William argues (p. 232) : " I re- 

 gard the plants above-mentioned as probably belonging to the 



*Trans, Royal Soc. Canada, Vol. II, New Series, Sect. IV, pp. 59-77, Ottawa, 

 1896. 



tintern. Scientific Series, Vol. LVI, 1892. 



