GEOLOGICAL SOCIETY. 



109 



rope, receive confirmation by all the facts hitherto ob- 

 tained of the like fossils observed in America : 



" Fossil Fuci are found even in the most ancient for- 

 mations of the globe j in the transition rocks of the north 

 of Europe and of America." 



" Such are the Fucoides dentatus? F. serra, F. an- 

 tiquus and F. Circinatus." 



"The Fuci become more abundant in the strata 

 which separate the limestone from the chalk, and some 

 remarkable species occur here." 



" In England, these fossils are of frequent occurrence 

 in the green sand formation which separates the Lias 

 and Oolitic series (calcaire jurassique) from the chalk." 



"It has been demonstrated that the Marine, like 

 terrestrial vegetation, approaches nearer to that of our 

 own climates, in proportion as they occur in the more 

 recent formations. They present, on the contrary, 

 characters equally resembling those of the vegetation 

 of equatorial climates, in proportion as they occur in 

 more ancient formations." Hist, des veg. foss. torn. 1. 

 p. p. 41. 43. 45. 47. 



The following list embraces all the determined spe- 

 cies, hitherto discovered in North America. 



