11 



In a tributary valley entering Porcupine creek, from the west, a section forty feet and 

 three inches in thickness contains a lignite bed nine inches thick at a depth of eleven and 

 one-half feet. At a depth of seventeen feet there is another lignite bed eighteen feet thick. 

 This rests upon soft, grey sandstone, and like the bed above, is overlaid with banded yellow- 

 grey and purple clays containing well preserved plant remains. 



The flora of Great valley and Porcupine creek was first studied by Sir William Dawson 

 in 1875 (25, 327-331). This list was extended and published in 1886 (24, 17-31) as 

 the result of further collections. More recently Penhallow (79, 33-95, 73, 60, 61) has 

 revised the woods of these collections and determined doubtful species, and in the course of 

 this revision it was tound that some new species must be included. As now known upon the 

 basis of these studies, the flora of this district is composed as follows : — 



1. JSsculus antiguas, Dn. 



2. Garya antiquorum, Newb. 



3. Carpolithes sp. 



4. Castanea sp. (Quercus of the report of 1879 80). 



5. Catalpa crassifolia, Newb. 



6. Corylus americana, Walt. 



7. macquarrii, Heer. 



8. rostrata. Ait. 



9. Cupressoxylon dawsoni, Penh. Wood. 



10. Davallia tenuifolia, Sw. 



11. Diospyros sp. 



1 2. Equisetum sp. 



13. Equisetum parlatorii, (Heer) Knowlton. 



14. Gingho sp. (Probably G. adiantoides). 



15. Glyptostrohus ev/ropceus, (Brongn) Heer. 



16. Juglans cinerea ? L. 



17. rhamnoides, Lesq. 



18. rugosa, Lesq. 



19. schimperi, Lesq. 



20. Lemna scutata, Dn. 



21. Onoclea sensibilis, Newb. 



22. Paliurus colombi, Heer. 



23. Phyllites sp. 



24. caparinoides, Newb. 



25. venosus, Newb. 



26. Phragmites sp. 



27. Platanus haydenii, Newb. 



28. heterophyllus, Newb. 



29. nobilis, Newb. 



30. raynoldsii, Newb. 



31. Populus aceri folia, Newb. 



32. arctica, Heer. 



33. genetrix, Newb. 



34. richardsoni, Heer. 



35. Pseudotsuga miocena, Penh. Wood. 



36. Quercus sp. 



37. Rhamnus sp. 



38. concinnus, Newb. 



