PLIOCENE; PISLLYPAMPA BOLIVIA 159 



titude of not over about 5,000 feet. 9 This elevation also 

 corresponds approximately to the present upper limit in this 

 latitude of Pithecolobium, Sapindus, Myrcia and Coussapoa. 

 Saccoglottis, so far as I know, does not reach this altitude. 

 Moreover all of the Pisllypampa forms are lowland tropical 

 types that reach to these altitudes under favorable environ- 

 mental conditions and which are normally present in great 

 force at much lower levels. 



It seems to me therefore, that the indicated change of 

 level since this fossil flora was living could not have been 

 less than 6,500 feet, and that there is no negative evidence 

 that it may not have been as much as 9,000 feet. 



DESCRIPTION OF THE FOSSIL PLANTS 



Phylum Pteridophyta 



Class LEPTOSPORANGIAT^E 



Order POLYPODIALES 



Family POLYPODIACE/E 



Genus GONIOPTERIS Presl 

 Goniopteris cochabanibensis Berry, sp. nov. 



PLATES I and II 



Fronds of large size, probably bipinnate; with a stout, 

 prominently winged rachis at least 5 mm. in maximum width. 

 Pinnae alternate, shortly stipitate, linear-lanceolate in outline ; 

 at least 15 cm. in maximum length and 1.5 cm. to 2 cm. in 

 maximum width. Pinnae pinnatifid, separated by acute sin- 

 uses reaching from 1/2 to 2/3 of the distance to the rachis, 

 into inequilateral segments which vary from a broadly 

 rounded to a more or less conical shape, the latter appearance 

 heightened by the more or less revolute margins. Margins 

 entire. Texture coriaceous, resulting in the venation appear- 

 ing much stouter than it really is in the material preserved as 



9 1 have found low palms such as Geonoma and Chamaedorea some- 

 what higher than 5000 feet in the Yungas. 



