1890.] Geology and Paleontology. 769 
afford conclusive evidence that these dikes record seismic movemen} 
during the Tertiary. (Bull. Geol. Soc. Am., Vol I.). 
G. M. Dawson proposes (Am. Jour. Sci., March, 1890) the name 
Nanaimo Group instead of Dr. White's ** Vancouver," to designate 
the equivalent of the Chico Group in the Vancouver Island region. 
In the Am. Jour. Sci., Oct. 1889, are some suggestions from G. H. 
Eldridge as to a method of grouping the formations of the Middle 
Cretaceous, He proposes to include in the lower of the more general 
divisions the formations of the Fort Benton and Niobara; in the 
upper, the Fort Pierre and Fox Hills ; for the former no better name 
can be found than the one now in use, Colorado ; for the latter the 
name Montana is now for the first time proposed. It is, however, 
etymologically objectionable, because it is found principally on the 
plains ! : 
R. T. Hill does not concur in the proposed suggestion to abandon 
the Meek and Hayden sub-division of the Upper Cretaceous. If the 
beds lose their identity in Colorado, they appear in Texas in a manner 
which only confirms the original Nebraska section in its characters 
and succession. (Am. Jour. Sci., Dec. 1889.) 
Various widely scattered observations enable G. M. Dawson to state 
Am. Jour. Sci., Aug. 1889) that a great earlier Cretaceous formation, 
beneath the horizon of the Dakota, is more or less continuously devel- 
oped over a vast tract of country, the eastern edge of which lies to the 
east of the present line of the Rocky Mountains, from the 49th parallel 
to the Arctic Ocean, and which is represented to the west as far as 
the vicinity of the mouth of the Fraser River, the Queen Charlotte’s 
Islands, and in the Yukon Valley beyond the r41st meridian, in the 
| interior of Alaska. 
Mesozoic.—After a thorough study of rocks from twenty-six locali- 
' ties in the Connecticut valley, W. M. Davis and C. S. Whittle have 
come to the conclusion that the eastern trap ranges present a uniform 
association of the numerous characters of extrusive sheets, while the 
western trap range as consistently manifests the several characteristics 
of an intrusive sheet. (Bull. Mus. Comp. Zool., Vol. XVI., No. 6.) 
A recent communication from R. Lydekker to the Quar. Jour. 
Geol, Soc., 1890, contains an account of Iguanodont remains from the 
Wadhurst clay; a description of a metatarsus of a Megolausaurian 
(M. dunkeri) from the same deposit ; and a note in regard to some 
vertebr of a Sauropterygian. 2 
