KNowLTox.J GEOLOGICAL CONSIDERATIONS. 105 



Columbia, l)ut it is doul)tfiil if it ha.s been correctly det(?rmino(l. 

 Othervviso, this species is found from the Fort Union to the Miocene. 

 Flcu.^ planicostata is of i-ather doubtful occurrence at Bridge Creek. 

 It is a Laramie and Denver species. Frdxtrins dentieulafa is also a 

 doul)tful form at Bridg-e Creek; it has l)een reported from Evanston, 

 Wyoming, in l)eds supposed to ])e of Laramie age, and in the Liv- 

 ingston l)eds of Montana. Juglans Schurqyrri is found in the Denver 

 beds at Golden, Colorado. The remaining species are all found in or 

 above the Fort LTnion beds. Two are found in the Eocene in general, 

 5 in the so-called Eocene of Alaska, 6 in the Green River beds of 

 Wyoming, and '1 (one of which is doubtful) in the Miocene. 



The conclusion reached in my preliminar^y paper — that these beds 

 should be regarded as Upper Eocene in age — appears to have been 

 justified. The fact of this higher distribution than the plants of 

 Cherry Creek is further emphasized by a review of the species related 

 to the forms indigenous to these beds. Thus, the species described 

 as Jmjlaux cryptata is closely related to J. dentlcnlata Lesq., from 

 the Green River, Wj^oming, and other localities. Quercus consirnilis 

 is related to Q. drymeja, reported in this country from the Green 

 River. Quercus s'linplex is related to Q. (■(msiniills^ differing merely 

 by the entire margin, while Q. Breiveri is similarly closel}^ related, 

 differing in being much longer and .narrower. Ulmus speciosa is 

 suggestive of U. Braunii, found in this countr}^ in the Green River 

 beds at Florissant, Colorado. The species I have described as 

 IT. Neioherryi is close to U. apjeclosa^ being smaller and narrower. 

 Platanus Condoni is clearly related to P. hasllohafa of the Fort Union 

 beds of Montana, being evidently a more highly developed form than 

 that species. Crataegus flavescens^ which, as already pointed out, is 

 the same as Lesquereux's Myrica divers! folia as identified by him at 

 Bridge (^reek, is certainly very similar to the originals of this from 

 Florissant, Colorado. This list could be further extended if necessary. 



OTHER LOCALITIES. 



There are a number of other localities discovered by Dr. Merriam 

 that are evidently the same age as Bridge Creek. None of them have 

 afforded a flora of more than three or four species. They are as follows : 



ONE AND ONE-HALF MILES EAST OF CLARNOS FERRY. 



From this locality the following species have been obtained: 



Sequoia Langsdorfii ( Brgt. ) Heer. 

 Alnus carpinoides Lesq. 

 Acer sp. 



ONE-HALF MILE NORTHEAST OF FOSSIL. 



This locality has yielded the following: 



Sequoia Langsdorfii (Brgt.) Heer. 

 Myrica? personata n. sp. 

 Alnus carpinoides Lesq. 



