86 REPORT OF NATIONAL MUSEUM, 1921. 



Coal, Coke & Mining Co., St. Louis, Mo.; and a fossil elephant skull, 

 acquired by purchase, are additional accessions worthy of note. Men- 

 tion may also be made of the acquisition of an original oil painting 

 of a life restoration of the flying reptile Ornithostoma which. was 

 deposited by the Smithsonian Institution. 



Of prime importance among the accessions to the section of 

 paleobotany are large collections from the Eocene formations of 

 southeastern North America, described and figured by E. W. Berry 

 in Professional Pajoers of the United States Geological Survey. 

 Following these should be noted gifts of unusually well-preserved 

 exhibition and stud}' specimens from Malheur County, Oreg., and 

 Coeur d'Alene, Idaho, the former presented by Mr. Sam Ballantyne, 

 Boise, and the latter by Henry J. Eust, Coeur d'Alene, Idaho. 

 Valuable material was also included in the extensive collection from 

 China received from Professor Louderback, mention of which is 

 made above. 



Explorations and expeditions. — Explorations were confined wholly 

 to the division of paleontology. The field season of 1920 was spent 

 as usual by Secretary Walcott in the Canadian Rockies. His work 

 had for its object the determination of the character and extent of 

 the great interval of nondeposition of sedimentary rock-forming 

 material along the Front Range of the Rockies west of Calgary, 

 Alberta, and the clearing up of the relations of the sunmait and base 

 of the great Glacier Lake section of 1919 to the geological forma- 

 tions above and below. Early in July work was begun along the 

 Ghost River northeast of Banff; the Rocky Mountain front was 

 studied and among its cliffs a new formation of Lower Middle 

 Cambrian age was determined. Forty miles north of Lake Louise 

 a geological section was studied in detail that tied in the base of 

 the Glacier Lake section with the Middle and Lower Cambrian 

 formations. Proceeding to the upper valley of the Clear Water 

 River, a most perfectly exposed series of limestones, shales, and sand- 

 stones of Upper Cambrian and later formations was found, which 

 cleared up the relations of the upper portion of the Glacier Lake 

 section to the Ordovician formations above. 



During July, 1920, and again in January, 1921, Curator Bassler 

 was engaged in the preparation of casts of type specimens of fos- 

 sils in the Walker Museum, University of Chicago, in continua- 

 tion of plans to attain for the national collections their proper com- 

 pleteness by having represented all available type specimens. The 

 casting of all the Devonian, Mississippian, and Pennsylvanian types 

 in the Walker Museum, amounting to some thousands of specimens, 

 was accomplished during these two visits. 



Dr. E. O. Ulrich, of the Geological Survey, associate in paleon- 

 tology, continued his field researches on the Cambrian and Ordo- 



