262 TEN YEAKS' PROGRESS IN VERTEBRATE PALEONTOLOGY 



the Antilocapridge and Antilopidse l)y Merriam, of the rodents by Scott 

 and Matthew, the Titanotheres and Iihinoceroses by Osborn, the Carni- 

 vora by AVortman, the Litopterna and Edentata by Scott, the Multituber- 

 culata by Gidley, the Marsupialia by Bensley and Sinclair, the Insecti- 

 vora by "\Yortman, Scott, and Matthew, and various artiodactyls by Peter- 

 son, Loomis, Matthew, and Douglass; and this list includes only the 

 names of our own immediate colleagues. To all these must be added the 

 masterly summarization of our existing knowledge and its coordination 

 and correlation by Osborn and Gregory. 



In no other class of animal or vegetable life has classification — that is, 

 real phylogen}^ — reached the high plane that it has in the Mammalia; 

 nowhere does taxonomy, that bugbear of the microscopist, approximate 

 so near the final truth, and this happy result has been due chiefly to the 

 paleontologist. To him has been and always will be the last word in 

 taxonom}^ — that is, evolution. 



CONTRIBUTIONS TO GEOLOGIC THEORY AND METHOD BY AMERICAN 

 WORKERS IN VERTEBRATE PALEONTOLOGY 



BY WILLIAM J. SINCLAIR 



Since 1901 vertebrate paleontologists have named and described six- 

 teen formations on the basis of fossils contained therein as follows : 



CRETACEOUS 



Hell Creek (Upper Cretaceous), Montana. Brown, 1907. 



EOCENE 



Lost Cabin (Lower Eocene), northwestern Wyoming. Sinclair and 

 Granger, 1911. 



Lysite (Lower Eocene), northwestern Wyoming. Sinclair and Gran- 

 ger, 1911. 



MIOCENE 



Mascall (Middle Miocene), Oregon. Merriam, 1901. 

 Pawnee Creek (Middle Miocene), Colorado. Matthew, 1901. 

 Gering (Lower Miocene), AYyoming-Nebraska. Hatcher, 1902. 

 Monroe Creek (Lower Miocene), Wyoming-Nebraska. Hatcher, 1902. 

 Harrison (Lower Miocene), Wyoming-J^ebraska. Hatcher, 1902. 

 Clarendon (Upper Miocene), Texas. Gidle}', 1903. 

 Panhandle (Middle or Lower Miocene), Texas. Gidley, 1903. 



