January 20, 1899.] 



SCIENCE. 



103 



ditious in sballow water. Tlie surround- 

 iug land areas seem to liavo been reduced 

 nearly to base-level and deeplj' covered with 

 residuary materials immediately preceding 

 the deposition of these beds, but during 

 their deposition subsidence of the estuary 

 and elevation of the surrounding areas was 

 in progress. The paper was illustrated by 

 lantern slides. 



In discussion B. K. Emerson brought out 

 many points of resemblance with the Jura- 

 trias strata of the Connecticut Valley and 

 N. S. Shaler compared them with those of 

 the Richmond, Va., basin. He argued 

 against their marine origin and in favor 

 of lakes either salt or fresh. A. Heilprin 

 spoke of the fishes which were considered 

 as probably marine by Cope, but N. S. 

 Shaler stated in reply that near Eichmond 

 the fish were found in association with vege- 

 table remains. No definite view was reached 

 on this point, although B. K. Emerson re- 

 marked that the casts of salt crystals were 

 often seen in the shales in ISTew England. 

 I. C. Eussell raised the point of the former 

 extension of the Newark strata of New 

 Jersey to the eastward, but the author had 

 no light to throw on the question. J. E. 

 Wolff and J. F. Kemp discussed the distri- 

 bution of the boulders from the trap and its 

 contacts over New York City and Long Is- 

 land. 



Discovery of Fossil Fish in the Jurassic of the 

 Black Sills. N. H. Daeton, Washing- 

 ton, D. C. 



The speaker exhibited several specimens 

 of the recently discovered fossil fish and 

 described their occurrence in the Jurassic 

 beds on the confines of the Black Hills. 

 The fish are now being investigated by 

 specialists. The paper was immediately 

 followed by the next one. 



Mesozoic Stratigraphy in the Southeastern Black 

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

 The author exhibited a diagram of details 



of stratigraphy determined in 1898. The 

 investigation resulted iu the discovery of 

 marine Jurassic in the southern Black Hills, 

 and of an horizon of large vertebrates in 

 the lower Cretaceous. The pajDer was beau- 

 tifully illustrated by lantern slides, and on 

 its conclusion the Society adjourned un- 

 til the following day. 



In the evening the Fellows attended the 

 reception, which was most hospitably ex- 

 tended to the visiting scientific societies by 

 the authorities of the American Museum, 

 and listened with great interest to the ad- 

 dresses of Mr. Morris K. Jesup and Pro- 

 fessor Henry F. Osboru. They also at- 

 tended the reception given by Professor 

 Osborn, at his residence, at the close of the 

 lecture. 



On reassembling Thursday morning the 

 reading of papers was at once resumed, 

 the following two contributions being pre- 

 sented together : 



Relations of Tertiary Formations in the Western 

 Nebraska Begions. N. H. Dabton, Wash- 

 ington, D. C. 



This paper presented the results of sev- 

 eral seasons' investigations of the White 

 Eiver and the Loup Fork formations, ex- 

 tending from the South Platte Eiver into 

 the Bad Lands of South Dakota. 



Shorelines of Tertiary Lakes on the Slopes of the 



Black Hills. N. H. Darton, Washington, 



D. C. 



During the season of 1898 the author dis- 

 covered extensive and beautiful shorelines 

 and deposits of the Tertiary lakes far up 

 the slopes of the Black Hills. They throw 

 interesting light on certain stages of physio- 

 graphic development of the Black Hills and 

 the origin and condition of deposition of 

 some of the White River sediments. 



No discussion resulted. 



General Geology of the Cascade Mountains in 

 Northern Washington. Israel C. Russell, 

 Ann Arbor, Mich. 



