An Old Platte Channel. — Condrc. 369 
The fact that the old channel was eroded, for the most part, 
in glacial beds evidently precludes (unless there have been two 
advances of the ice in Nebraska) the idea that the Platte was 
dammed by the ice sheet in the region of Fremont and thus 
caused to overllow southward for a time along the axis of the 
buried channel. This condition seems to show that the valleys 
are post-glacial in origin. The presence of twenty feet of 
loess covering the level flood plain shows that the river has 
not occupied the valley since the last of that bed was deposited. 
The rather mature W^ahoo valley, between Wahoo and Ash- 
land, is an example of how much work a small post-loessan 
stream has done in soft beds. 
While it is quite generally thought by geologists that this 
part of the Platte valley is of pre-glacial origin, there is very 
little evidence to warrant such a conclusion. I do not know 
that any portion of the lower narrow course of the Platte 
trough was in existence pre-glacially. Certain conditions cause 
me to think that the valley may be older at Fremont than at 
South Bend and that a deep pre-glacial channel may extend 
southeastward from Fremont and A'alley to the Missouri river. 
The stratified clays and sandis there may represent frontal wash 
in a broad pre-glacial valley or basin. 
RELATIVE AGE OF THE LANCE CREEK* (CERA- 
TOPS) BEDS OF CONVERSE COUNTY, 
WYOMING, THE JUDITH RIVER BEDS 
OF MONTANA AND THE BELLY 
RIVER BEDS OF CANADA. 
By J. B. Hatcher, Carnegie Museum, Pittsburg, Pa. 
In their memoir entitled "On Vertebrata of the Mid-Creta- 
ceous of the Northwest Territory," published as Part II, \^ol. 
Ill, of "Contributions to Canadian Paleontology" (Ottawa, 
September, 1902), professors H. F. Osborn and L. M. Lambe 
have made an important addition to our knowledge of the ver- 
tebrate fauna of the Belly River beds. Many new species of 
fishes, batrachians, turtles, crocodiles, dinosaurs and mammals 
have been described and illustrated with most excellent figures. 
* The name Ceratops beds cannot be used for these Wyomint? deposits, 
and I give to them the above name, from the principal stream in the region 
where they are best represented in Converse county, Wyoming. 
