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 Papers of the United States Geological Survey. 
Following these should be noted gifts of unusually well-preserved 
exhibition and study specimens from Malheur County, Oreg., and 
Coeur d’Alene, Idaho, the former presented by Mr. Sam Ballantyne, 
Boise, and the latter by Henry J. Rust, 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 ex peditions—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 summit 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- 
