THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XLIII. — The Vertebrate Fossils of Rock Creek, Texas ; 

 by Edward L. Troxell.* With Plate IX. 



[Contributions from the Marsh Publication Fund, Peabody Museum, 

 Yale University.] 



Outline. 



Introduction 



The use of ratios 

 List of species 

 Equidae 

 Camelidae 



Extinction 

 Canidas 

 Suidse 



Testudinidse 

 Megalonychidae 

 Elephantidse 

 Summary 

 Bibliography 

 List of illustrations 



Introduction. 



In the field season of 1912 Peabody Museum of Yale Uni- 

 versity sent out an expedition to the Panhandle region of 

 Texas under the charge of Professor R. S. Lull. The part}^ 

 spent about six weeks at the head of Rock Creek (see map, 

 fig. 1) in Briscoe County searching for vertebrate fossils, aud 

 from this locality were secured the specimens described in 

 this paper. 



About thirteen species were found, consisting of seven differ- 

 ent families represented to-day by the living forms of camel, 

 dog, horse, elephant, sloth, peccary, and turtle. 



Besides the two principal deposits, various fragments and 

 isolated bones were found along Rock Creek and Tule Canyon. 



* Abstract of a thesis presented in partial fulfillment of the requirements 

 for the degree of Doctor of Philosophy at Yale University, 1914. 



Am. Jour. Sci.— Fourth Series, Vol. XXXIX, No. 234.— June, 1915. 

 40 



