24 



LARAMIE FLORA OF THE DENVER BASIN. 



ring at Black Buttes, Wyo., in beds which were 

 then supposed to be in the Laramie but which 

 in my opinion subsequent work has shown 

 pretty conclusively to be of post-Laramie age. 

 This naturally makes a difference in the weight 

 given to Laramie position. Furthermore, as 

 already stated, much of the material from 

 Pulpit Rock and vicinity is very fragmentary 

 and difficult to identify satisfactorily, but in 

 the light of the material obtained farther east 

 it becomes clearer, and this has permitted 

 certain revisions of earlier determinations. 

 Below are the lists from Templeton Gap and 

 vicinity; the first one is a revision of the one 

 given above: 



Bluffs west of Templeton Gap: 



Sequoia obovata? Knowlton ined. 



Sequoia acuminata Lesquereux. 



Dammara sp. 



Cyperacites sp. 



Salix sp. 



Ficus trinervis Knowlton. 



Rhamnua-salicifolius Lesquereux. 



Carpites sp. (Palmocarpon?). > 

 Palmer's ranch, Templeton Gap, 4 miles northeast 

 of Colorado Springs: 



Carpites sp. 



Sequoia sp.? 

 Palmer's ranch, half a mile farther west: 



Rhamnus salicifolius? Lesquereux. 



Platanus? sp. 



Viburnum sp., probably new. 



These lots may be considered together. Of 

 the four named species, two (Sequoia acumi- 

 nata and Ficus trinervis) were described 

 originally from specimens obtained at Black 

 Buttes, Wyo.; the other two are survivals from 

 the Laramie or older. Of these the Rhamnus 

 is well known as crossing the line between 

 Cretaceous and Tertiary, but the Sequoia had 

 not previously been recognized as doing this. 

 The Sequoia, however, is represented only by 

 a single rather poorly preserved branchlet' and 

 may not be correctly determined. The Dam- 

 mara is apparently an undescribed form; it is 

 Cretaceous in type, though the genus is still 

 living. 



The several localities above mentioned as 

 lying out on the plains to the east and north- 

 east of Colorado Springs may now be con- 

 sidered. It is a well-known fact that the 

 Laramie, as well as certain overlying beds, 

 stands at acute angles in many places near the 

 mountains, but within a few miles the dips 

 rapidly diminish and the beds become nearly 



horizontal. The country becomes grass covered, 

 rock exposures are few and far between, and 

 sections showing the contacts of the forma- 

 tional units are still fewer. It is especially 

 difficult to establish satisfactorily the line 

 between the Laramie and the overlying beds 

 in this plains region, and recourse must be had 

 to paleontology in the allocation of the more 

 or less isolated localities. 



A number of plant collections haVe been 

 made at these uncertain points in the section. 

 According to Eichardson, by whom most of 

 these collections were made, the plant-bearing 

 beds are 1,000 feet or more, as determined by 

 drill records, above the Fox Hills, and be- 

 tween 20 and 150 feet below a bed of conglom- 

 erate that marks the base of a thick deposit 

 of coarse-grained light-colored arkose which 

 is lithologically quite distinct from the 

 underlying fine-grained drab and buff-colored 

 plant-bearing sandstones and shales resem- 

 bling the typical Laramie. It is suggested by 

 Richardson, on stratigraphic grounds, as a 

 possibility worth considering that these leaves 

 come from a horizon high in the Laramie, 

 approximately equivalent to the Scranton coal 

 zone 15 miles east of Denver, from which few 

 leaves have heretofore been collected. 



Below are the lists of plants from the locali- 

 ties mentioned : 



Near Mosby, Colo., 30 feet above coal: 



Flabellaria? sp., fragmentary. 



Pteris undulata Lesquereux. 



Anemia. 



Equisetum sp. 



Ficus denveriana? Cockerell. 



Laurus socialis Lesquereux. 



Laurus wardiana? Knowlton. 



Viburnum marginatum? Lesquereux. 



Sapindus sp. 

 One-fourth mile east of Purdon's mine, Colo.: 



Platanus haydenii Newberry. 



Nelumbo? new, fine. 



Hedera sp., new, fine. 



Populus nebrascensis Newberry. 



Ficus sp.? 



Sapindus sp.? 

 Red Hill, 4 miles south of Ramah, Colo.: 



PlatanuB raynoldsii Newberry. 



Vitis olriki Heer. 



Cissus lobato-crenata Lesquereux. 



Myrica? sp.? 

 NW. 1 sec. 30, T. 9 S., R. 60 W., 50 feet belpw 

 conglomerate: 



Platanus sp. cf. P. haydenii? 



Platanus rhomboidea Lesquereux. 



Populus sp.? 



