ART. 22 TERTIARY FOSSIL PLANTS FROM ARGENTINA BERRY 



The two Santa Cruz localities are : 



112. (One league north of Estancia Chalia) (Bob. Lively's place in 

 lot 77), Rio Chalia; and 



116. (Bluff 1/2 league south of Mata Amarilla, upper Rio Chalia.) 

 The age of the last is given as Santa Cruzian ? 



FLORA 



A total of 27 different forms are more or less satisfactorily identi- 

 fied and 19 of these appear to be new. They comprise 22 genera in 17 

 families and 14 orders, and represent 4 ferns, 1 cycad, 2 conifers, 1 

 monocotyledon, and 19 dicotyledons. None except form genera have 

 furnished more than a single species and no families except the 

 Polypodiaceae and Monimiaceae are represented by more than a 

 single species. 



The largest number of forms identified from any single locality is 

 but 9. There are 16 species recorded from the Rio Negro localities 

 and 11 from the Rio Chalia localities. None are common to the 

 two ; even the genera are all different, and they appear to be different 

 in age as well as in the environmental conditions which they indicate. 



The three Rio Negro localities have but one species common to 

 two of them, so that they may not be of exactly the same age, but the 

 data are insufficient to affirm or deny this, and I am considering them 

 collectively as affording certain contrasts. with the two Rio Chalia 

 localities. 



These three localities in Rio Negro Territory are all in the vicinity 

 of Lago Nahuel Huapi and apparently from what Roth called the 

 Piso de Nahuel Huapi. They have yielded the following florule: 



Alsophila antarctica. 

 Pteris iiirihuaoensis. 

 Filioltes sp. 1. 

 Filicites sp. 2. 

 Zamia ausiralis. 

 Araucana natlwrsti. 

 Soirpites sp. 

 Fagus (f) sulferruffinea. 



Nothofaffus s Implicidens. 

 Leguminosites calliandrafomi is. 

 Leguminosites sp. 

 Anacardites (f) patagonicus. 

 Myroia nit ens. 

 Phgllites nirihuaoensis. 

 PhylUtes mollinediaformis. 

 PhyUites sp. (cf. Schinopsis). 



This florule is too small for any accurate ecologic estimate ; never- 

 theless the Zamia is the only form that is far removed from its pres- 

 ent-day range, and Zamia occurs abundantly in the lower Miocene 

 coal measures of the Arauco district in Chile, where, however, it is 

 associated with much warmer types. A comparison with the flora 

 described from Mirhoja, Chubut Territory, nearly 2° farther south, 

 shows no common species between the two and none of the meso- 

 phytic warm types of the latter, so that the present florule must be 

 considered to be a distinctly cooler temperate flora. Compared with 



