COLLECTIONS FROM VARIOUS LOCALITIES. 145 



lar age for the Siberian beds and also for those of Oregon. The simi- 

 larity of a number of the forms to those of the-^Lower Lias and the Rhetic 

 may be explained by a survival of a portion of the Rhetic flora into 

 the Lias and the Lower Oolite. It must be remembered that climatal 

 conditions were apparently remarkably uniform throughout the Jurassic, 

 a condition very favorable for the persistence of types. The resem- 

 blance between the plants of the Lower Lias and Rhetic formations 

 and those of Yorkshire has long been known. 



OTHER PLAKT-BEARING BEDS IK THE JURASSIC, OR FORMING THE 

 TRAXSITIOIS" TO THE LOWER CRETACEOUS. 



On August 8, 1884, Dr. A. C. Peale, while making investigations 

 in northern Montana, collected a small specimen bearing the distinct 

 impression of a coniferous leafy twig. It was found on the east slope 

 of the Bridger Range, north of Bridger Creek, 4 miles northeast of 

 Bozeman, in about latitude 44° 44' N., longitude 110° 44' W., in strata 

 regarded by him as Jurassic, and the specimen was so labeled. It is 

 in a limestone ■ underlying the green sandstone described in Hayden's 

 Annual Report for 1872, on page 475 ("Last foot of Bridger Peak, etc."). 

 The plant proves to be the Sequoia Reichenbachi, which certainly extends 

 to the base of the Cretaceous and has its ancestral forms in the Jurasic. 



In the summer of 1884 Mr. Henry D. Woolfe sent to the Smith- 

 sonian Institution from Cape Lisburne, Alaska, two boxes of coal, some 

 rock specimens, and some shales bearing leaf impressions. These last 

 were referred to the Department of Fossil Plants of the National Museum, 

 where they remained some time, but finally, on September 30, 1885, 

 they were sent, along with a number of other undetermined collections, 

 to Prof. Leo Lesquereux for determination. In due time Professor 

 Lesquereux submitted his report, or rather a series of reports, which 

 were compiled and edited by F. H. Knowlton and published in the 

 Proceedings of the United States National Museum, Vol. X, pp. 21-46; 

 Vol. XI, pp. 11-38, pi. iv-xvi. The plants from Cape Lisburne are 

 described in Vol. X, p. 36, and Vol. XI, pp. 31-33, and figured mostly 

 on pi. xvi of Vol. XI. 



A larger and better collection than the one made by Mr. Woolfe 

 and from . the same general reigon has recently arrived. From the 

 meager data that have been furnished it is learned that it was made 



MON XLVIU — 05 10 



