142 Scientific Intelligence. 



Whitman Cross [Intrusive sandstone dikes in granite) men- 

 tioned the occurrence, in the area of the Pike's Peak granite mass, 

 in Colorado, of sandstone bodies whose formal relations to the 

 granite are perfectly analogous to those of dikes of igneous rock, 

 while the substance of the masses in question is purely a clastic 

 mixture, almost wholly of quartz, of fine and even grain, very 

 similar to sandstones of sedimentary origin. (Author's abstract). 



A paper by T. C. Chamberi.in and Frank Leverett on Cer- 

 tain features of the past drainage systems of the upper Ohio 

 basin, will be presented in full in this Journal. 



The subject discussed and illustrated by specimens under 

 title of a paper on Facetted pebbles on Cape Cod, by W. M. 

 Davis has already been referred to in this Journal (vol. xlvii, p. 

 63) by J. B. Wood worth. 



Alphetis Hyatt made a communication upon " The Fossils 

 of the Trias and Jura of the Western States" and exhibited speci- 

 mens of the fossils; his remarks may be summed up as follows: 

 The discovery of Monotis beds above the Carboniferous in 

 American Caiion, south of Cisco, California, showed the probable 

 existence of the Trias there, but just above these in Sailor's Caiion 

 occurred beds of Daonella which were more doubtful. The 

 Daonellse, although hitherto considered exclusively Triassic, oc- 

 curred in part near the upper limits of their distribution in curi- 

 ous association with Ammonitinas of very doubtful aspect. 



These Ammonitinas are not as a whole like any fauna here- 

 tofore described as Triassic. They have a distinctly Liassic 

 facies and with them Dr. Curtice found two specimens of Apty- 

 chi of the rugose type, which in Europe have not yet made their 

 appearance below the tipper Lias. For these reasons the speaker 

 considered the age of Daonella beds and Ammonites beds to be 

 doubtful, and stated that until specimens showing the sutures of 

 the Ammonitinae were found this could not be determined with 

 certainty. 



The Triassic fossils of Gabb's locality in New Pass Desatoya 

 Mts., and near Walker's Lake in Nevada have been found 

 recently in a collection donated by Prof. Whitney to the Museum 

 of Comparative Zoology, and these prove the identity of the 

 faunas at these two localities with that of the Muschelkalk of the 

 Star Peak Range also in Nevada but farther west. 



lias. 



The same collection contained Gabb's type of Arnioceras 

 (Amm.) Nevadanus and a Comiceras, n. sp. showing the exist- 

 ence of the Lower Lias near Walker's Lake in southwestern 

 Nevada. 



A small collection of fossils from Professor Condon, coming 

 from the Blue Mts. of eastern Oregon, showed species identical 

 with those of the Hardgrave Sandstone of Taylorville and with 

 some of the species described by Gabb from near Walker's Lake, 



