194 KNOWLTON 



southeast of Bozeman, Montana, have now been located," and more- 

 over the matrix is characteristically that of the Livingston. Between 

 this point and the base of the upper member of the Fort Union 

 according to Stanton is a thickness of 3000 to 5000 feet of beds, a 

 portion of the lower part of which belongs with little doubt to the 

 Livingston, but the top of the Livingston has not been definitely 

 placed, though its maximum thickness apparently exceeds 2000 

 feet. The dinosaurs occur in this thick series of beds above the 

 Livingston, and the beds are probably referable to the lower member 

 of the Fort Union, though no plants have been found until within 

 approximately 1000 feet of the top, where the following species have 

 been obtained: 



Wido'ecomb Bros, ranch, northeast of Melville, Montana [sec. 29, T. 6 N.. 

 R. 16 E.] 

 Salix sp. 



Populus amhlyrhyncha Ward. 

 Popidus cuneata Newb. 

 Populus genetrix Newb. 

 Populus daphnogenoides Ward. 

 Populus sp. 

 Aralia notata Newb. 

 Legumino sites arachioi 'es Les(|. 

 Vilis xantlwlithensis Ward. 

 Credneria daturccfolia Ward. 

 Phyllites cupanoides Newb. 

 Carpites sp. 



These plants occur about 1200 feet below the small mammals 

 now being studied by Mr. Gidley and regarded by him as of Tor- 

 rejon afifinities, though scattering remains of mammals have been 

 found down nearly to the horizon of the plants. The nearest point 

 at which dinosaurs occur is stratigraphically about 600 feet below 

 the mammal horizon, according to the collector, while according to 

 Stanton the main Triccratops horizon may be 2000 to 3000 feet 

 below this point. 



'* When this collection was first studied it proved very puzzling, and 

 although no species were positively identified, it was tentatively regarded 

 possibly Laramie or older. Subsequently, however, large collections were 

 made and studied from the Livingston with the result of showing that it 

 clearly belongs to the latter. 



