On ytirassic Stratigraphy on the West 

 Side of the Black Hills — Second 

 Paper on American Jttrassic Strati- 

 graphy. 



By F. B. Loom IS. 



AUTHOR'S EDITION, extracted from BULLETIN 



OF THE 



Vol. XVI, Article -XXXI, pp. 401-407, PH. liv-lv. 

 Nezv York, Nov. j, igo2. 



