On the Cretaceous Flora of Russian Sakhalin, 



49 



1878. Heetî, Beiträge zur fossilen Flora Sibiriens und des Amurlande>, F. F. 



A., vol. V, parfc 2, p. 35, 49, pl. IX, f. 3 ? ; XV, f. 3-5. 

 1880. Heer, Xachträge zur fossilen Flora Grönlands, F. F. A„ vol. VI, 



part 1, p. 9, pl. IV, f. 1. 

 1880. Heer, Beiträge zur miocenen Flora von Nord-Canada, F. F. A., vol. 



VI, part 3, p. 13, pl. I, f. 2e ; II, f. (5, 7. 

 1883. Heer, Die Tertiäre Flora von Grönland, F. F. A., vol. II, p. 74, 



pl. LXVII, f. 2, 3 ; XCVI, f. 1. 



Localities : Cape de la Jonquière ; near Cape Rogatyi ; 

 sea-sbore at Mgach ; the Tymovskaya river. 



This characteristic 

 species, found in many 

 arctic floras, is very 

 abundantly represented in 

 Sakhalin, not only in the 

 Orokkian, but in the older 

 horizon — Gyliakian. This 

 same species was recorded 

 by Heer from Mgach, and as a fact of special interest, he found 

 it on a plate of shale with impressions of NUssonia. He, however, 

 beUeved, that Populus arctica is a typical Tertiary species, and 

 that was the reason why he neglected the testimony of NUssonia, 

 in favour of the greater antiquity of the flora. He thus put the 

 whole flora of Sakhalin in the rank of other Arctic Floras, describ- 

 ed by him as " Tertiary " and properly " Miocene." No represen- 

 tative of this species has been recognized in the floras of Atane 

 and Patoot, but the very similar Populus amissa He,^' that was 

 compared by Heee himself with P. arctica, was recorded from the 

 Cretaceous of Atane. We must, however, bear in mind, that the 

 first representative of Populus is found already in the Kome flora. 



Fig. 7. 

 Populus arctica Heer. 



1) Heeb (1883), p. C5, pl. XX\1II, f. 18. 



