20 SMITHSONIAN INSTITUTION 



formation Ojo Alamo received its name. Little success was met with 

 here, and after going over all the exposures within easy access of the 

 camp without finding anything of importance, we moved to Hunter's 

 store (now known as the Bisti Trading Company) situated at the edge 

 of the Navajo Indian Reservation. Camp was pitched in the midst of 

 an extensive area of bad lands made up of the Fruitland, Kirtland, 

 McDermott, and Ojo Alamo formations. A few days of prospecting 

 combined with the previous experience soon convinced us that the best 

 opjxjrtunity for obtaining desirable material was offered by the Kirt- 

 land formation, to which, from this time on, our work was largely 

 confined. An articulated tail of a large hadrosaurian dinosaur ; por- 

 tions of the skull of a horned dinosaur of the Cliasiiiosaiirus type, new 

 to the fauna and probably a new species ; articulated limb and foot 

 bones of a small ceratopsian reptile ; and nO' less than 20 turtles, many 

 of them complete shells and some of large size, are a few of the out- 

 standing acquisitions. The turtles pertain to the genera Baena, Adocits, 

 Nciirankylus, Plastouicmis, Aspiderctcs, and Aniyda. Many of these 

 were found in places inaccessible by either auto or wagon and had to 

 be packed out on our backs or lashed to the saddle of an Indian pony. 

 At times the extreme heat and blinding sandstorms made the work 

 of collecting very arduous. 



On June 25, having covered all available collecting ground, camp 

 was again moved some 10 miles north to Brimhall's Wash. From this 

 time on, daily moves were made northward until the close of opera- 

 tions, a few turtles and fragmentary dinosaur specimens resulting. 

 Much to our disappointment, the available collecting ground became 

 progressively more and more restricted as we moved toward Farm- 

 ington. Much of the surface was covered by windblown sand and it 

 was only here and there that small patches offered opportunity for 

 collecting. On account of these conditions, I decided to suspend opera- 

 tions some two weeks earlier than had been planned. The next few 

 days were spent in packing the material collected which filled ten 

 large boxes having a combined weight of 3,200 pounds. 



Although disappointed by our failure to find more articulated speci- 

 mens, we feel that the material acquired will contribute much of 

 scientific interest. Several of the specimens apparently represent un- 

 described species and hence the known faunal lists of these several 

 Upper Cretaceous formations will be considerably augmented. The 

 turtles are exceptionally perfect specimens, and, with those already 

 in the collections, assure to the Museum the most extensive series of 

 Upper Cretaceous turtles in any institution in North America. 



As a collecting field for fossil vertebrates, the San Juan Basin 

 area, taken as a whole, is disappointing. Extensive areas of well 



