FLORA OF LAKOTA OF F.FACK HILLS. 817 



previoush- i-cccivcd. T was al)lo to rcfcf the larger pai't of them to species 

 already desci'ilxMl with tireater or less coiifideiun^. The residue remain 

 indeterminable. I completetl (his work on May L'i, and prei)ared an 

 ai'ticli^ eml)odyin<>:; the results and de.-ei'il)in<z; the 7 additional new 

 species, one of whicli, ho\vever, as we have seen (se(> pp. 208 to 204), 

 has provc'd to l>e ])rol)al)ly of .lurassie ajie and to Ix'loiii;' to tlie fiienus 

 Cycadella. The illustrations for this article wei'e prepared by Doctor 

 Beecher after my departure for Europe from memoranda which I fur- 

 nished liefore leavinjr. The article did not api)ear until Xovemljer." 



In addition to the matter relating to the Jurassic of the Black Hills 

 fui'iiished me l)y Mi-. Wieland (see pp. 203-204), he has also sent me his 

 notes on the Lakota obtained during liis investigation of the hills the 

 same season (1900). As these embody nuicli new information relating 

 to the flora of the Lower Cretaceous of the Black Hills, I gladly insert them 

 at this place. They consist of trial sections for the study of the fossil 

 faunas and floras of the formation, with appropriate discussion, and also 

 contain the description and illustration of a new species of Nilsonia 

 collected by Mr. Wieland. 



NOTES ON THE STRATIGRAPHY AND PALEONTOLOGY OF THE BLACK HILLS RIM. 



ByG. R. Wieland. 



The Unitetl States Geological Survey has for several years past engagei I 

 actively in the field investigation of the geology of the Black Hills, a 

 region whicli has been recognized by all as of paramount scientific interest. 

 Hence it might seem superfluous either to add to the various sections 

 already pulilished by Ward, Darton, and others, or in any -way to anticipate 

 the more extended publications of the Survey on this su1)ject. But as it 

 has been my good fortune to make extensive saurian and plant collections 

 in the Black Hills rim country, and as many of these specimens are types 

 of the highest interest and come from a series of localities girdling the 

 Black Hills, my notes on the localities and horizons in which these fossils 

 were secured may well l)e recorded. 



It is well known that 5 or 10 vertical feet may l)e just as important 

 from a biologic as from a stratigraphic standpoint. Far too often 



" Elal)oiation of the fossil cycftds in the Yale Museum, bv Lester F. Ward: ATn.,Iouni. Sci.,-lth ser., Vol. X, 

 November, HMX), pp. H27-:54.'), pi. ii-iv. 



