114 



LARAMIE FLORA OF THE DENVER BASIN. 



could probably not be distinguished from cer- 

 tain other described species, and the advisa- 

 bility of retaining it is open to question. It is 

 permitted to stand simply for the purpose of 

 showing that the horsetails were present in 

 these beds, though it may be but poorly char- 

 acterized. 



Occurrence: Laramie formation, Golden, 

 Colo., original Museum collections. 



Phylum SPERMATOPHYTA. 



Class GYMNOSPERMAE. 



Older CONIFERAIES. 



Family ARAtTCARIACEAE. 



Dammara sp. 



Plate II, figure 4. 



Dammara sp. Knowlton [nomen], U. S. Geol. Survey Bull. 

 696, p. 228, 1919. 



In the collection from the wooded bluff south 

 of Marshall, Colo., there is a single fragmentary 

 scale that appears to be a Dammara. It is 

 about 13 millimeters long and some 8 milli- 

 meters wide at the broadest point; it is strongly . 

 ribbed. The apical portion is broken away, 

 so it is impossible to observe the spine of the 

 scale, if there was one. The specimen is so 

 fragmentary that it is hardly worth while to 

 institute any comparisons with published 

 forms. It was found in the association with 

 Rhamnus salicifolius, Ehamnus g'oldianus f, and 

 the fragment of a fern described as Pterisf sp. 



Occurrence: Laramie formation, Marshall, 

 Colo., wooded bluff just south of station, high- 

 est point in section, collected by A. C. Peale. 



Family TAXODIACEAE. 

 Sequoia acuminata? Lesquereux. 



Plate II, figures 7, 8. 



Sequoia acuminata Lesquereux, U. S. Geol. and Geog. 

 Survey Terr. Ann. Rept. for 1874, p. 310, 1875; 

 idem for 1876, p. 500, 1878; idem, Bull., vol. 1, 

 No. 5, 2d ser., p. 384, 1876; Tertiary. flora: IT. S. 

 Geol. Survey Terr. Rept., vol. 7, p. 80, pi. 7, figs. 

 15-16a, 1878. 



The type specimens of this species are sup- 

 posed to be preserved in the United States 

 National Museum (No. 62), but they can not 

 now be found. So far as can be made out 

 from the figures it seems to be very close to 



Sequoia, longifolia Lesquereux, a fact which 

 Lesquereux recognized, as he says : 

 " This species differs from the former by the proportion- 

 ally narrower leaves, with a very distinct middle nerve, 

 and smooth surfaces; also by the stem, which is striate 

 when decorticated. * * * The average size of the 

 leaves is about the same in both forms, the leaves varying 

 from 3 to 6 centimeters long and from 2 to 5 millimeters 

 broad. 



In the collection from Cowan station there 

 is a single fragment that may belong to this 

 species, but it is so fragmentary that the 

 essential characters can not be made out with 

 certainty. 



The two examples figured, though frag- 

 mentary and not well preserved, appear to 

 agree in all essential features with the speci- 

 mens figured by Lesquereux. 



Occurrence: Post-Laramie, Black Buttes, 

 Wyo. (types). Laramie formation,? Cowan 

 station, 10 miles south of Denver, Colo., col- 

 lected by F. H. Knowlton; cut on Moffat rail- 

 road (Denver & Salt Lake) near Leyden Gulch, 

 Colo., collected by A. C. Peale. Dawson 

 arkose, Templeton Gap, 4 miles northeast of 

 Colorado Springs, Colo., collected by A. C. 

 Peale, 1908. 



Sequoia reichenbachi (Geinitz) Heer. 



Plate XX, figures 1, 2. 



Araucarites reichenbachi Geinitz, Oharakteristik der Schicht- 

 en und Petrefacten des sachsisch-bohmischen Krei- 

 degebirges, pt. 3, p. 98, pi. 24, fig. 4, 1842. 

 Sequoia reichenbachi (Geinitz) Heer, Flora fossilis arctica, 



vol. 1, p. 83, pi. 43, figs. Id, 2b, 5a, 1868. 

 Lesquereux, U. S. Geol. Survey Terr. Rept., vol. 6, 



p. 51, pi. 1, figs. 10-10b, 1874; U. S. Geol. Survey 



Mon. 17, p. 35, pi. 2, fig. 4, 1892. 

 Hollick, New York Acad. Sci. Trans., vol. 12, p. 30, 



pi. 1, fig. 18, 1892. 

 Fontaine, U. S. Geol. Survey Mon. 15, p. 243, pi. 118, 



figs. 1, 4; pi. 119, figs. 1-5; pi. 120, figs. 7, 8; pi. 122, 



fig. 2; pi. 167, fig. 5, 1889. 

 Dawson, Roy. Soc. Canada Trans., vol. 3, p. 21, 1882. 

 Newberry, U. S. Geol. Survey Mon. 26, p. 49, pi. 9, 



fig. 19, 1896. 

 Knowlton, U. S. Geol. Survey Mon. 32, pt. 2, p. 657, 



In the collection from Coal Creek, Boulder 

 County, Colo., there is a single specimen which 

 I am unable to separate from many of the fig- 

 ures referred to Sequoia reichenbachi, and I 

 have so regarded it. As may be noted in the 

 figure (PI. XX, fig. 1), it is a fairly well pre- 

 served specimen with a large main branch and 



