South Dakota School of Mines 19 



collected being later transferred to the U. S. National Museum. 

 Much of this collecting-, particularly during the years 1886, 

 '87, '88, was in immediate charge of Mr. J. B. Hatcher, one 

 of the most original and successful collectors that has ever 

 worked in the Badlands. 



The Newton- Jenney survey of the Black Hills, under direc- 

 tion of the Department of the Interior, was made in 1875. The 

 attention of this survey was directed particularly to the pre-Ter- 

 tiary rocks. Only brief study was given the Tertiary flanking the 

 nearer foothills and practically none at all to the deposits farther 

 away. 



The second epoch in the investigation of the badland for- 

 mations corresponds fairly closely, but not precisely, with the 

 Yale and U. S. Geological Survey field work. It may perhaps 

 be best considered as closing and the third epoch as beginning 

 with the first expedition under the direction of the American 

 Museum of Natural History in 1892. 



Important investigations begun by Princeton University 

 during the second epoch continued into the third. Princeton 

 was first represented by an expedition under direction of Prof. 

 W. B. Scott in 1882. Another expedition directed by Prof. 

 Scott, came in 1890. A third came in 1893, directed as before 

 by Prof. Scott, with whom was 'associated Mr. J. B. Hatcher. 

 A fourth party came in 1894, this time under the full direction 

 of Mr. Hatcher. The results of these expeditions were of very 

 great importance. The abundant fossil remains collected enabled 

 Prof. Scott to describe in a most complete manner a number of 

 the more noted extinct animals and to indicate with- more cer- 

 tainty their proper classification and relationship. 



The American Museum of Natural History entering the 

 field in 1892, was favored from the very first by important dis- 

 coveries. Since the first expedition, several parties have repre- 

 sented this institution in its field investigations. Backed by 

 abundant means and made up of capable investigators, they have 

 been able to carry home a large amount of extraordinarily valu- 

 able material. This has given opportunity to establish more 

 accurately the details of stratigraphy and correlation and to' in- 

 dicate with greater certainty the characteristics and habits of 

 the various animals while in the living state. The years in which 

 parties have been in the field, either in South Dakota or north- 

 western Nebraska are, 1892, '93, '94, '97, '03, '06, '08. Under 

 the direction of Prof. H. F. Osborn, Curator of the Department 

 of Vertebrate Paleontology, earlier a co-worker with Prof. Scott 



