FOX UILLS AND LOWER MEDICINE BOVV 



23 



Magnolia 7iervosa (Knowlton) Brown 

 Alagnolia pulchra Ward 

 Magnoliophyllum cordatum Dorf 

 Leguminosse 



Leguminosites arachioides minor Berry 

 AnacardiacetE 



Pistacia eriensis Knowlton 

 Celastraceaj 



*Celastrus taurinensis Ward 

 Riiamnaeeae 



*Rhamnus salicifolius Losqucreux 

 *Rham7i^is cleburni Lcsqucrcux 

 Zizyphus hendersoni Knowlton 

 Vitaccffi 



Cissites lobatu^ Dorf 

 Vitis slantoni (Ivnowlton) Brown 

 TiliacejB 



*Apeibopsis? laramiensis Knowlton 

 Grewiopsis saportana Lesquereux 



Cornacea; 



Cornophyllum wardii Dorf 

 Bignoniaceaj 



*Dombeyopsis obtusa Lesquereux 

 *Dombeyopsis trivialis Lesquereux 

 Caprifoliaceaj 



Viburrium marginatum Lesquereux 



Viburnum montanum Knowlton 

 Position Unccrtain 



PalcEoaster inquirenda Knowlton 



Carpites walcotti Dorf 



Carpites glumcrformis Lesquereux 



Phyllitcs craigensis Dorf 



PhylUtes wilderi Dorf 



Phyllites conwayi Dorf 



Phyllites colubrinoides Dorf 

 *Phyllites trillioides Dorf 



Phyllites sp. 



Bracts (?) 



QUANTITATIVE ANALYSIS 



For the purposes of both ecologic inferences and geologic correlation, it has 

 become increasingly instructive to make quantitative leaf-counts at locahties where 

 a large number of individual specimens can be obtained. In the Medicine Bow 

 formation only 3 localities have furnished a sufficient number of specimens for 

 consideration. At all 6 locaUties the plant-bearing horizons were found to be 

 within discontinuous, lenticular units, making extensive quarrying for quantitative 

 studies impossible. At those locahties where less than 200 specimens could be 

 secured a careful record was kept of the order of dominance of the various species. 



The leaf counts at Locahties P. 372, P. 374, and P. 376 are shown in table 1. 

 At the remaining 3 localities the order of relative abundance of those species rep- 

 resented by more than 5 specimens is as f ollows : 



Locality P. 371 



1. Dryophyllum subfaleatum 



2. Ficus triner^ns 



3. Ficus tesselata 



4. Pistacia eriensis 



5. Ficus planicostata 



6. Phyllites colubrinoides 



10. Cinnamomum affine 



The most abundant leaves are clearly those of Ficus planicostata, with 25.6 

 per cent of the 1700 specimens from 3 localities, and 5th, Ist, and 3rd, respectivelj', 

 Ln order of dominance at the other 3 localities. The remaining dominants in their 

 apparent relative order are as follows: Viburmmi marginatum, Myrica torreyi, 

 Dryophyllum subfalcatum, Grewiopsis saportana, Magnoliophyllum cordatum, Rham- 

 nus salicifolius, Rhamnus cleburni, and Trochodendroides nebrascensis. These 9 



