6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 72 



Ojo Alamo sandstone: — Continued. p^^j 



Sandstone, soft white, conglomeratic ; contains brown concretions ; 



horizon of the sauropod and other bones 6 



Sandstone, yellow to brown, conglomeratic ; contains an abimdance 



of siliceous pebbles as large as 3 inches in diameter 5 



Unconformity. 

 Kirtland shale : 



Shale, gray to drab, with several wine red layers ; scattered dinosaur 



bones 30 



Sandstone with lenses of grit, fine conglomerate, and many clay 



pellets 10 



Shale, gray 20± 



Farmington sandstone member : brown indurated sandstone and 



gray shale 8o± 



Shale, gray to drab, and sandstone, soft, gray-white iooo± 



Fruitland formation : 



Sandstone, shale, and coal. 



Directly associated with the bones of Alamosanrus are many other 

 fragmentary and undeterminable dinosaur bones, teeth of carnivor- 

 ous and Ceratopsian dinosaurs, dermal plates of an armored form, 

 turtle fragments, and crocodile bones. At nearly the same horizon 

 in adjacent localities on Barrel Spring Arroyo there were obtained 

 part of the frill of an undetermined Ceratopsian ' different from 

 known forms, dermal plates of an armored dinosaur," incomplete 

 vertebrae of a carnivorous dinosaur as large as Tyrannosaurus,^ 

 fragments of a Ceratopsian frill marked with radiating vasicular 

 grooves like those of Triceratops, but indeterminable.* This horizon 

 is also the source of the maxillary and fragments of a skull collected 

 by Sinclair and Granger and identified by Brown as Kritosaurus 

 naziaj ovhi s .^ 



From the uppermost part of the Kirtland shale near this locality 

 have been collected specimens that are closely related to species known 

 to be of Montana age : Kritosaurus navajovius Brown, skull and 



^ Gilmore, C. W., Reptilian faunas of the Torrejon, Puerco, and underlying 

 Upper Cretaceous formations of San Juan County, New Mexico : U. S. Geol. 

 Survey Prof. Paper 119, p. 65, 1919. 



^ Idem, p. 65, pi. 26, fig. 2. 



■'' Idem, p. 67. 



* Gilmore, Vertebrate faunas of the Ojo Alamo, Kirtland, and Fruitland 

 formations : U. S. Geol. Survey Prof. Paper 98, p. 287, 1916. 



° Sinclair, W. J., and Granger, Walter, Paleocene deposits of the San Juan 

 Basin, New Mexico : Am. Mus. Nat. Hist. Bull., vol. 33, p. 303, 1914. 



