682 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Sequoia langsdorfii (Brongt.) Heer. 



PI. LXXXII, tig. 2. 



Sequoia langsdorfii (Brongt.) Heer.: FL Terr, Helv., Vol. I, p. 54, PI. XX, fig. 2; PI. 

 XXI, tig. \. 



This is by far the most abundant and widely distributed conifer found 

 in the Yellowstone National Park, with the possible exception of Sequoia 

 magnified, known only from the internal structure. It occurs in many places 

 and in a variety of forms — that is to say, the branchlets and leaves are of 

 various sizes, showing that they have come from many individuals and 

 from different parts of the tree. They are not of the same size and char- 

 acter as specimens from the Fort Union group near the mouth of the Yel- 

 lowstone, 1 being rather smaller and not so spreading, but they are very 

 much like the typical leaves figured by Heer 2 from Greenland. 



In all cases, however, the attachment of the leaves appears to be 

 characteristic of this species. In one exceptional case the cellular structure 

 of the leaf could be made out. This agreed perfectly with one given by 

 Heer (loc. cit, fig. 21). 



In one or two cases male aments were observed which much resemble 

 those figured by Heer (loc. cit., tig. 19). 



Habitat: Fossil Forest Ridge, beds Nos. 4, 6, and 7; collected by 

 Lester F. Ward and F. H Knowlton, August 16-20, 1887. Cliff west of 

 Fossil Forest Ridge, altitude about 7,900 feet; collected by Lester F. 

 Ward and F. H. Knowlton, August 15, 18->7. East bank of Lamar River, 

 between Cache and Calfee creeks; collected by F. H. Knowlton, August 21, 

 1888. Southeast side of hill above Lost Creek, bed No. 1; collected by 

 F. H. Knowlton, August 9, 1888. Yancey fossil trees; collected by F. H. 

 Knowlton, August, 1888. South end of Crescent Hill, about 300 feet 

 above main wagon road, bed 6 feet below "Piatanus bed;" collected by 

 F. H. Knowlton, August 9, 1888. Northeast side of Crescent Hill, opposite 

 pond; collected by F. H. Knowlton, August 2, 1888. Yellowstone below 

 mouth of Elk Creek, bottom of bluff; collected by F. H. Knowlton, Aug-ust 

 29, 1888. Also obtained by Mr. Arnold Hague (September 4, 1897) from 



>Cf. Newberry: 111. Cret. and Tert. FL, PI. XI, fig. 4. 

 »F1. Foss. Arct., Vol. I, PI. II, figs. 2-22. 



