CONTRIBUTORS TO THE SYMPOSIUM 323 



The more traditional view that the sequence of life events was con- 

 current in America and Europe will be presented by the other speakers, 

 who will contend that the Cretaceous terminates at the close of the Age 

 of Eeptiles and is marked by the extinction of the great terrestrial dino- 

 saurs. 



Dr. T. W. Stanton will consider the evidence of geology and inverte- 

 brate paleontology, and will endeavor to show that there is insufficient 

 evidence of any general diastrophism prior to the close of the Age of 

 Eeptiles. 



Mr. Barnum Brown will point out that the succession of Ceratopsian 

 faunas in Upper Cretaceous time affords several distinct phases, the last 

 of which is that of the so-called "Lance" formation, which alone contains 

 the culminating genus Triceratops. 



Dr. W. D. Matthew will compare the "Lance'' and "Belly River" ver- 

 tebrate faunas with those of the Paleocene of the Puerco and Torrejon, 

 our oldest mammal-bearing horizons, and those of the Thanetien and 

 Cernaysien beds of France and Belgium. 



Dr. William J. Sinclair will describe the substitution of a rich mam- 

 malian for a terrestrial dinosaur fauna as it occurs in the succession of 

 the Ojo Alamo (supposed Upper Cretaceous) and Puerco (supposed 

 Paleocene) formations in northern N'ew Mexico.^ 



2 Doctor Sinclair's paper has been published as article xxii. vol. xxxiii, Bulletin Amer- 

 ican Museum of Natural History, 1914, pp. 297-316. 



