January 26, 1900.] 



SCIENCE. 



143 



and gave the distribution of both the ma- 

 rine and fresh water beds in that portion 

 lying east of the North Platte river and 

 south of the Fremont and Elkborn Rail- 

 road. Geological sections from several lo- 

 calities were discussed and reference was 

 made to their fossilized remains. The 

 Jurassic were distinguished from the Tri- 

 assic. The question was raised as to the 

 advisability of retaining the double term 

 Jura-Trias, and its retention was opposed. 

 The age of the fresh water beds was dis- 

 cussed. Some hints were then given as to 

 the grouping of the Rocky Mountain Juras- 

 sic beds and the correlation of them with 

 European. 



S. F. Emmons remarked the interest of 

 the work and the contrasts afforded by the 

 Wyoming Jurassic with the Colorado beds. 

 H. W. Turner spoke of the desirability of 

 dropping the name' Jura-Trias. W. H. 

 Weed mentioned the parallelism with the 

 Yellowstone Park Jurassic. Bailey Willis 

 explained the early use of the term Jura- 

 Trias, as coordinate with carboniferous and 

 cretaceous, and that it would be split up 

 into local names in the inevitable develop- 

 ment of field observation. 



THE CEBTAOEOUS AND TERTIARY SECTION BE- 

 TWEEN CAPE FEAR AND FAYETTE- 

 VILLE, N. C. 



J. A. Holmes, Chapel Hill, N. C. 



The speaker remarked the importance of 

 the Hatteras uplift, which extends west- 

 ward through the ' Sand Hill ' region. An 

 east and west section was exhibited passing 

 through Wilmington, N. C, and it was 

 shown that there was a great unconformity 

 between the Cretaceous embracing the Eu- 

 taw (300') and Eipley (800') and the 

 Tertiary. In the Tertiary very important 

 erosion intervals were also shown at the 

 close of the Eocene and Lafayette. 



The paper was discussed by W. B. Clark, 

 who remarked the relations of the strata to 



others to the north and especially the 

 absence of the Potomac bed. N. H. Car- 

 ton made a comparison between the section 

 of the Wilmington well and the Norfolk 

 well. Gr. B. Shattuck remarked the great 

 oscillations of the Atlantic coast that were 

 indicated by these sections. He cited thir- 

 teen known unconformities in the coastal 

 plain. T. W. Stanton described the rela- 

 tions of the fossils brought up by the well- 

 borings, to others from Florida. J. A. 

 Holmes remarked the location of the hinge 

 line of the oscillations and the plans novv 

 maturing for their measurement. 



MESOZOIC STRATIGRAPHY OF BLACK HILLS 

 OF SOUTH DAKOTA. 



N. H. Darton, Washington, D. C. 



The Black Hills uplift brings to view the 

 entire series of Mesozoic formations under- 

 lying the plains. These comprise Laramie, 

 Fox Hills, Pierre, Niobrara, Benton, Da- 

 kota, Lower Cretaceous, Jurassic and Tri- 

 assic formations. A detailed investigation 

 has been made by the author of the beds 

 from Jurassic to Pierre, and a large amount 

 of detailed data obtained. Fossils have 

 been discovered in the Jurassic beds com- 

 prising fish in the basal members, as an- 

 nounced last year, the southern extension of 

 the marine fauna in the intermediate series 

 and additional Dinosaur remains in the 

 upper beds. The relation of the Dakota to 

 the Lower Cretaceous formations were set 

 forth, and an account was given of many 

 newly-discovered features in the strati- 

 graphy of the Benton and Niobrara depos- 

 its. In the Pierre shales there has been 

 discovered a horizon of calcareous lenses of 

 Lueina occidentalis giving rise to tepee buttes 

 somewhat similar to those described by 

 Gilbert in southeastern Colorado. There 

 was exhibited a fragment of fossil fish found 

 in the Triassic Eed beds. 



The paper was followed immediately by 

 the next title. 



