FOSSIL PLANTS. 467 



This letter itt' Professor Lesquereux's was reproduced withoul change 

 l>v Dr. Hayden in liis Third Annual Report of the Dnited States* i-eological 

 Surve\ of the Territories, 1869. 1 



The next considerable collection of plants appears to have Keen made 

 l>v Professor Lesquereux himself in July and August, L872. From this 

 collection he was enabled to enumerate lo species (of which 15 were new) 

 from Golden, I from Marshall's, and 7 from the Erie mines, in the Boulder 

 Valley. 2 



In L873 Dr. A. C. Peale appears to have first detected the presence of 

 Dakota group plants in the Rocky Mountain region, having found obscure 

 impressions on the south side of the South Platte River. It was not until 

 some years later, however, thai they were obtained in abundance within the 

 area under consideration. 



In 1X74 Lesquereux added 3 about 1" species to the Golden flora, thus 

 bringing the number up to over 50 species. 



A complete list of all the plants of the Cretaceous and Tertiary of 

 North America known at the time was given l>v Professor Lesquereux in 

 Hayden's Annual Report for lx7n'. 4 This list was undoubtedly compiled 

 from the Tertiary Flora, which also appeared in L878, the year of the pub- 

 lication of this Annual Report. 



The Tertiary flora' was a very comprehensive work, and contains 

 descriptions and figures of nearly all the plants belonging to what was at 

 that time regarded as Tertiary. The volume contains plants that are now- 

 known to belong to the Laramie. Denver, Fort Union, Green River groups, 

 and .Miocene. Aboul 88 species were accredited to Golden and a number 

 of others to near-by localities. 



The last large collection of Golden plants made before the one forming 

 tin- Wasis of this chapter was obtained l>v Rev. Arthur Lakes tor the 

 Museum of Comparative Zoology at Cambridge, -Mass. This collection 



wa< elaborated by Professor Lesquereaux. 8 It contained 873 specimens, 



1 Third Ami. Eept. I". S.Geol. Surv. Terr., 1869, pp. 196, 197, reprint of is::;. 

 -Sixth Ann. Eept. U. S. Geol. Surv. Terr., 1872 | 1873), pp. 375-384. 



Eighth Ann. Kept. 0. S. Geol. and Geog. Surv. Terr., 1871 (1876), pp. 308-315. 

 'Op.cil , 1873 (1878), pp. ist 520. 

 6 Rept. U. 8. Geol. Surv. Terr., Vol. VII, 1878. 

 • Ball. Mas. Comp. Zool. Harvard Coll., Vol. X VI. pp. 43-59. 



