University of North Dakota. • 1 1 



163— Petri lied Wood. 



Bluck Jlills, Dakota. 

 164— Petrified Wood. 



Black Hills, Dakota. 



165 — PetJ-ified Wood. Near Mato Tipi (l>ear's Lodge or 

 Devil's Tower). Mato Ti])i is a rock in the north- 

 western part of the Black Hills. It is almost cylin- 

 drical and perpendicular, consists of volcanic" tra- 

 chyte, is 376 feet in diameter at its summit, and is 625 

 feet in height. 



166 167 — Crude Petroleum in bottles. 



From well near Mato Tipi. 

 168 — Ore of Graphite or Plumbago. 



Black Hills, Dakota. 

 169 170 — Rock, carrying fossil leaves. 



"Bad Lands," near the Black Hills, Dakota. 



171-174— Fossiliferous Limestone Rock. 'J'hese specimens. c(,)n- 

 tain many small shells, most of which are bivalve En- 

 tomostraca, and so far as known to the author, their 

 first discovery in Dakota was made bv him in August, 

 1885. 



Near Spearfish, Black Hills, Dakota. 



175 — Large slab of rock, carr} ing fossil bivalve shells. 



Buffalo Gai>, Black Hills, Dakota. 



176 — Fossil Lioceramus. A large bivalve shell belonging 

 to the Lamellibranchiate molluscs. 



From "Bad Lauds," lu-ar the Black Hills, Dakota. 

 177 — Fossil bivalve shell. 



From "Ba<l Lands/' near the Black Hills, Dako'ta. 



■M 



178 — Mass of fossil Gastero)>od and other shells, cemenled 

 togetlier ])y lime. 



F>ora "Bad Lands," near the Jilack Hills, Dakota. 



