The Rekjn of RejytUes 



in the United States National Museum and the 

 museum of Yale University. The famous Bone 

 Cabin Quarry, from which the American Mu- 

 seum of Natural History has obtained literally 

 tons of material, is partly in Albany County 

 and partly in Carbon County, Wyo. The 

 fossils from these localities are of the Jurassic 

 period, and so are those from Albany County 

 and the Freezeout Mountains, Wyo. From 

 the Cretaceous rocks of Converse County, 

 Wyo., have been taken all specimens of the 

 great Triceratops so far found, and Laramie 

 County, which adjoins it, has yielded many 

 Cretaceous specimens. . In the East dinosaurs 

 have been found at Haddonfield, N. J., and at 

 Muirkirk, Md., but in this last place bones are 

 few and scattered, and the exact period they 

 represent is still in dispute. 



Compared with other periods, the time 

 represented by the Jurassic is not of long- 

 duration. The strata in this country, as stated 

 by Professor Osborn, are somewhat under a 

 mile in thickness, the estimate of years not far 

 from an even million. The principal features 



175 



