BOTANICAL DISCUSSION. 119 



that the fauna of the Patoot beds proved them to be Senonian. The observations of 

 White and Schuchert a have confirmed the reference of the Patoot beds to the 

 Senonian, and they also show such close faunal and stratigraphic relations between 

 the two series as to make it probable that the lower Atane beds are Senonian. We 

 may therefore consider our insular flora and its equivalents on the mainland as, in 

 part at least, Senonian in age, with possibly the oldest portion of it as old as late 

 Cenomanian. Whether Turonian time is represented in the sediments and floras of 

 the region must be left for future investigation. It is interesting to note in this con- 

 nection that the fauna of the ClifTwood clays as recently lisfed by Weller b shows only 

 Senonian affinities. 



No attempt has been made at an exhaustive comparison with the Cretaceous 

 flora of Europe, but an examination of the Senonian flora of Quedlinburg, in Saxony, 

 and of the Cenomanian flora of Moletein, in Saxony, described by Heer, and that of 

 Bohemia, described by Velenovsky and Bayer, shows that our insular flora is closely 

 related to all of them, as they contain such characteristic species as Dammara 

 borealis Heer, Widdringtonites Beichii (Etts.) Heer, CunningJiamites elegans (Corda) 

 Endl., Moriconia cyclotoxon Deb. and Etts., etc. 



In the following table the distribution of the insular flora as above outlined is set 

 forth in detail. It might have been extended so as to include the lower Potomac 

 formation of the South and the Laramie and allied formations of the West; but inas- 

 much as the facts in relation to the distribution of the species which would be thus 

 included are not essential to the solution of the insular flora correlation problem, 

 these features are omitted. 



a Cretaceous series of the west coast of Greenland: Bull. Geol. Soc. Am., vol. 9, 1898, pp. 343-368. 

 & Jour. Geol., vol. 13, 1905, pp. 324-337. 



