Eaton — Vertebrate Fossils from Ayusbamba, Peru. 141 



Art. IX. — Vertebrate Fossils from Ayusbamba, Peru; by 

 Geokge F. Eaton* With Plates V, VI, VII. 



While engaged upon the field-work of the Peruvian Expedi- 

 tion of 19 J 2, I had the pleasure of accompanying Dr. Albert 

 Giesecke, President of the University of Cuzco, on a hasty 

 visit to a locality near Ayusbamba, among the mountains about 

 thirty miles south of Cuzco, where he had previously obtained 

 some fragmentary vertebrate fossils. On this occasion a few 

 hours only could be spent in the field ; but as it seemed prob- 

 able that by going over the ground carefully, further material 

 might be secured, Professor Bingham, the Director of the 

 Expedition, gave his consent to my making another visit to 

 the locality, this time in company with Professor Gregory, the 

 geologist, Mr. K. C. Heald, assistant topographer, and Mr. 

 C. Duque. Although other important work caused the post- 

 ponement of this trip until the middle of November, when 

 the rainy season, unfavorable to fossil-hunting in the moun- 

 tains, had set in, we were able to obtain material of consider- 

 able value during the brief time our party was in the field. 

 To Sr. Emeterio Calvo, the master of the delightful hacienda 

 Ayusbamba, I owe my sincere thanks, not only for permission 

 to collect upon his land, but also for the generous hospitality 

 extended to our party. 



The fossils that form the subject of these notes occurred at 

 an altitude of about 12,100 feet, in gravel and clay beds and in 

 surface-wash along the southern margin of a small lake, the 

 original contours of which are partially indicated in the map 

 (fig. 8) accompanying the preceding article by Professor 

 Gregory. An excellent view, looking southerly across the 

 fossil grounds, appears as fig. 6 of Professor Gregory's report. 

 Very nearly the reverse view (JST. 5° E. Mag.) taken from the 

 south rim of the basin, is shown in text-figure 1 of the present 

 article. After taking this photograph the camera was turned 

 a little to the right (N. 30 E.) and the view shown in text- 

 figure 2 was taken. These two views together cover practically 

 all of the fossil grounds. Almost at the exact center of 

 Professor Gregory's fig. 6, a mastodon's blade bone was found. 

 The nearer view of this spot (text-figure 3) is equally charac- 

 teristic of several other places where fossils occurred. In this 

 photograph, taken while waiting for the protective jacket of 

 burlap and plaster to dry, appears one of our faithful arrieros 

 whose interest in collecting fossils made him very helpful. 



With few exceptions, fractured and dissociated material only 

 * Osteologist of the Peruvian Expedition of 1912. 



Am. Jour. Sci.— Fourth Series, Vol. XXXVII, No. 218.— February, 1914. 

 11 



