RARITAN FORMATION— CORRELu\TlON. 25 



which make their first appearance in the Patapsco. These are 

 Aralia, Celastrophyilum, Cissites, Eucalyptus and Ficus. The 

 genus Celastrophyilum, with a large display of forms in both 

 the Patapsco and the Raritan, has one identical species, C. Brit- 

 tonianum Hollick, while C. Hunteri of the former is very close 

 and ancestral, if not actiudly identical, Avith C. augustifoliuni 

 Newb. of the Raritan. 



Among the conifers the widespread Widdringtonites ramosus 

 (Font.) Berry, of the Patapsco, is closely related, if not identical, 

 with the equally common Widdringtonites Reichii (Ettings.) 

 Pleer of the Raritan and succeeding formations. The genus 

 Frenelopsis has closely related species in both, while Sequoia and 

 Thiiyites have already been mentioned as well as the cycadean 

 genus Podozauiitcs which extends back to the Triassic. Two 

 Raritan species are recorded from the European Albian. These 

 are Sequoia Reichenbachi (Gein.) Heer and Eucalyptus angusta 

 Velen., the former a very wide ranging form and the latter re- 

 corded from the Albian of Portugal and the Cenomanian of 

 Bohemia. 



Turning to the elements in the Raritan flora which ally it with 

 yo'unger floras, we find that 6 of the Raritan species persist as 

 late as the Senonian of Europe, and 15 are found in the 

 Patoot beds of Greenland, which are also usually regarded as 

 of Senonian age. All but 4 of these are, however, found in 

 the Cenomanian beds of that country, and practically all of the 

 others and those from' the Senonian of Europe as well, occur 

 somewhere in Cenomanian strata. There are 34 species common 

 to the Raritan flora and that of the Dakota Group, the former 

 lacking more particularly the numerous^ forms of Betula, Quer- 

 cits, Platanus, etc., which characterize the latter. There are 32 

 species common to the Raritan and to the Atane beds of 

 Greenland, the latter formation being usually regarded as Ceno- 

 manian in age, and there are 67 species common to the Raritan 

 and A'lagothy floras, although these latter figures are somewhat 

 obscured by the difficulty of determining the probable age of 

 many of the species recorded from Long Island and other areas 

 in the vicinity of the terminal moraine and by the additional 

 fact that the Upper Raritan at South Amboy furnished many 



