!">(> PROCEEDINGS OP THE AMHERST MEETING 



The Oreodon beds are believed to have been deposited over a baseleveled 

 plain by streams. As a result of fluctuations in run-off, possibly climatically 

 controlled, the fine sediment spread over the plain was cut across at intervals 

 by stream channels filled with coarse detritus, the Metamynodon channels, 

 which may interrupt the lower zone of rusty nodules or lie below or above it. 

 The whole sequence of beds suggests climatic control. Local beds of nodular 

 limestone produced by blue-green algae at intervals throughout the formations. 



Since both nodular zones afford abundant fossils, collecting during the past 

 two years has been largely confined to them. Their narrowness seems to 

 assure the contemporaneity of the forms obtained from each. The lower 

 nodular zone probably afforded the fossils collected 70 years ago by T. A. 

 Culbertson and others, as it is exposed at his localities and still abounds there 

 in fossil turtles, as described in his diary. 



Presented in abstract from notes, with the use of lantern-slide illus- 

 tration. 



Discussed l>v W. I). Mat! hew. 



Discussion 



Dr. Matthew: Dr. Sinclair's work is of fundamental importance in the 

 exact correlation and succession of the later Tertiary mammal faunas. In 

 attempting to obtain exact faunal results it has been found that more precise 

 and thorough stratigraphic studies in the principal fossil formations were 

 essential. This could best be begun with the White River Oligocene in its 

 typical exposures in the Big Badlands of South Dakota. Dr. Sinclair's paper 

 shows the great progress already made in this formation. 



DISCUSSION <>L Till) PLEISTOCENE AND ITS VERTEBRATE I'M VAX 



BY OLIVER T. MAY 



(Abstract) 



1. Limits of the 1'leistocene. 



2. The Pleistocene of the Nebraskan glacial stage. 



.'5. The early Pleistocene a time of widespread elevations of the continent. 



4. The early Pleistocene a time of commingling of faunas from widely sepa- 

 rated origins. 



5. The Pleistocene not a time of rapid evolution of the vertebrates, but of 

 extensive destruction of species. 



Read from manuscript. 

 Discussed by George F. Kay. 



LICKS AND CAVES OF THE LOWER OHIO VALLEY AS REPOSITORIES OF 

 1/ t 1/ 1/ \LI \\ REMAINS, INCLUDING THOSE OF 1/ I V ' 



BY ARTHUR M. MILLER 



Upward of a century ago interest in mammalian remains entombed in the 

 licks and caves of the Lower Ohio Valley was much more pronounced than it 

 Has been in recent years. 



1 Manuscripl received by Hie Secretary of the Society in December, l '.►•_» i 



