U. S NATIONAL MUSEUM 



PROCEEDINGS. VOL 81, ART. 18 PL . 1 





Dinosaur National Monument 



Tlie caudal vcrtchrat' of Apatosnurus in tlic niidulf fort.'ground was the initial discovery that led to 

 the development (if this great (iiiarry. In uncovering this skeleton other specimens were found, 

 and so it continued to ilevelop during the entire 15 years that work was carried on there. From a 

 photograph by Earl Douglass. 



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Dinosaur National Monument 



Quarry viewed from tlie west end of the Carnegie .Museum e.\cavalion. Tlu^ fossil-bearing layer has 

 been largely removed from the uptiltod rocks on tlie left of the jiicture. The track was used for a 

 small mine car on which the dehris was removed to Ihe dump. I'^roni a iihotograi)h by Earl Douglass. 



