408 GEOLOGICAL SURVEY OP THE TERRITORIES. 



tion aud outline are identical, they can scarcely be recognized as belong- 

 ing to this species. Among theiu are two specimens from above the 

 coal of Spring Oairon, near Fort Ellis, representing the same leaf. It 

 is'G cent, long, 3 cent, wide, elliptical, lanceolate-pointed, tapering to 

 the petiole in a round curve, with secondary veins numerous, variable 

 in distance, some separated by shorter veinlets, the lower ones at a 

 broader angle of divergence than the superior ones, and the lowest shorter 

 pair nearly at a right angle to the medial nerve; nervilles perpendicular 

 to the lateral veins. If these characters of nervation are those of Jug- 

 Jans riKjosa^ Lsqx., as also of Juglans acuminata, Heer, they are those 

 also of Jvglans retusta, Heer, Flor. Tert. Helv., p. 90, PI. cxxvii. Figs, 

 40-44 ; a species with smaller leaves, of a form similar to that of ours. 

 We have, however, intermediate specimens which, coming from the 

 same stations, seem to disparage the separation of these forms into two 

 species. 



Juglans denticulata, Heer. 



The same small form as the one remarked upon in Rept., 1871, p. 

 298. The specimens are from the same place. 



Cassia phaseolites, Ung. Fl. v. Sotzka, p. 58, PL xlv. 



Leaves, membranaceous ; petiole elliptical, tapering downward by a 

 curve to the petiole; lowest pair of secondary veins at a distance from 

 the base, opposite. 



This species is figured by Unger, with numerous leaves and one of its 

 pods. Heer, too, has it in the same way in his Flor. Tert. Helv., PI. 

 cxxxvii, Figs. 66 to 74. The numerous specimens obtained from the 

 different localities of this station merely represent leaves. These in 

 their different forms and variety of nervation agree so well with the 

 European leaves that they may be referred to this species with little 

 doubt. The angle of divergence of the secondary veins is variable, as 

 also the more or less rounded base of the leaves. It is often unequilat- 

 eral. 



GENERAL REMARKS. 

 f 



The following table of comparison, indicating the distribution of 

 ■ species at different localities, completes, to this time, the one published 

 in the former report. For researches like those which have been detailed 

 in this paper, aud for a science which, like vegetable paleontology, is still, 

 with us at least, in an incipient state, a document of this kind cannot 

 be dispensed with. Besides pointing out the march of the researches 

 and the discoveries made in the flora of our Tertiary, the table is a most 

 convenient record to show at a glance the points of relations or of dif- 

 ferences which may be more reliably considered in the discussion on the 

 geological age of certain groups. It has been essentially prepared to 

 that purpose, and, therefore, slightly modified or rather simplified, to 

 render it more explicit. The characters of the Tertiary groups of Europe 

 are not satisfactorily fixed by vegetable paleontology ; therefore, the 

 relation of some our species with separate Miocene divisions is unimport- 

 ant. On another side, the few fossil species known as yet in Europe as 

 truly Eocene, claim a more scrupulous comparison with ours on account 

 of the conclusion admitted in the first part of this report — that the 

 whole North American Lignitic formation is Eocene. The table, there- 



