South Dakota School of Mines 



Bulletin No. 13. Plate No. 48. 



A. Petrified egg of a supposed anatine (duck like) bird of Oligocene 

 age. Farrington, 1899. 



&* A 



mm 



w 



"'~?± 



B. Stylemys nel>rascens\s, the commonest fossil turtle of the Big Bad- 

 lands, Leidy, 1853. 



