VI. PRELIMINARY DESCRIPTIONS OF SOME NEW TITAN- 

 OTHERES FROM THE UINTA DEPOSITS. 



By Earl Douglass. 



The writer, with an assistant, Mr. J. F. Goetschius, spent the sum- 

 mer of 1908 collecting fossils in the Uinta Basin in eastern Utah and 

 western Colorado. The principal object of the expedition was the 

 acquisition of Upper Eocene vertebrates and the extension of our 

 knowledge of the geology of the region and the sequence of the extinct 

 mammalian faunae. About thirteen years had elapsed since the last 

 collecting party had visited the Uinta deposits, and the underlying Ter- 

 tiary formations had never been carefully explored. 



The Director of the Carnegie Museum, Dr. William J. Holland, 

 made it possible to conduct the expedition as the present writer 

 believed it should be conducted, and by dint of thorough and persistent 

 search it was successful in securing a large collection of mammals and 

 reptiles from several different levels of the Uinta deposits through a 

 thickness of 700 feet, or more, of strata. The collections came prin- 

 cipally from Horizon " B " of Peterson, and probably, as a rule, from 

 lower levels than those from which previous collections had been made. 

 This undoubtedly accounts for the fact, that, as the fossils are removed 

 from the matrix, a large proportion of them are seen to belong to un- 

 described species, or exhibit some differences from those which have 

 been previously described. 



On account of the large amount of work to be done at the Museum 

 and the condition of the specimens from the Uinta deposits the work 

 of clearing the fossils from the matrix has proceeded slowly, and only 

 a small portion of the material is ready for study. As the absence of 

 the writer during the summer will suspend the work in the laboratory, 

 and as Professor Henry F. Osborn, who is preparing a memoir on the 

 Titanotheres, says that it is especially important that we should know 

 more of the Upper Eocene members of that family, it is thought best 

 to publish a short description of some of those which present new char- 

 acters. 



Had it not been for the kindness of Professor Osborn in allowing 



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